Top 29 Indoor Water Heaters on Amazon (Verified You can Buy)
Top 1
Best for Inline
Best for Tanked
Best for Electric
Best for Battery
Best for LP
Best for NG
Best for Compact
Best for Mini
Best for Outdoor
Best for Thermostat
Best for Timer
Best for Waterproof
Best for Under Sink
Best for Wall
Best for Residential
Best for 120 Volt
Best for Boiler
Best for 10 Gallon
Best for 20 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 100 Gallon
Best for Stiebel Eltron
Best for AO Smith
Bosch Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounted
Bosch
ES 2.5-1M WIR S3100
13.75 x 10.75 x 13.75 inches
15.5 pounds
98%
Ratings for Bosch (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ✅ | ✅ | ✅ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
CONVENIENT HOT WATER HEATER: 2.5 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it. Thermal efficiency is 98%. Dimensions : 13.75 W x 13.75 H x 10.75 D Inches
LONG LASTING QUALITY: This electric water heater is easy to maintain and has premium glass-lined material for a long service life. (Amps 12A, Volts (VAC) 120)
NEW Rinnai RX130iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 7.1 GPM, 130,000 BTU
Rinnai
RX130iN
19.0 x 19.0 x 31.0 inches
54.0 Pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| eFaucets | 9,712 | ❌ | ❌ | ❌ |
Features
One Model, Anywhere: This Rinnai tankless water heater is installable indoors or outdoors thanks to our new Versa Vent and powered by either propane or natural gas thanks to a Smart Sense gas control system; RX-OVC vent cap required for outdoor install
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This condensing propane and natural gas tankless water heater from Rinnai is only the size of a small suitcase, but provides up to 7.1 GPM (4 fixtures at once)
Top 3
Best for LP
Best for Propane Liquid
Best for Propane
Best Gas Water Heaters
Best for 30 Gallon
Best for 75 Gallon
Best for Tankless
Best for Eccotemp
Propane Tankless Water Heater, 4.21GPM 16L Indoor, Constant propane water heater,Instant Hot Propane Gas Water Heater with Multi-Protection
VELPAX
HWRSQ-001
13.8 x 13.8 x 21.7 inches
22.9501 pounds
Ratings for VELPAX (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| DIVACEN | - | ❌ | ❌ | ❌ |
Features
【Tankless Water Heater】– This propane tankless water heater features steady temperature control and multiple safety protections, including a flame failure device, anti-freeze protection, and overheating protection. It operates with just 3.6 PSI of water pressure, with a working pressure range of 3.6 PSI – 116 PSI, delivering up to 4.21 gallons of hot water per minute. With a maximum temperature rise of 65°C(149°F), this unit is designed exclusively for use with propane (LPG).
【Efficient & Energy-Saving】– With a high-performance output of 68,000 BTU per hour, this 4.21 GPM instant propane water heater provides on-demand hot water for 2–3 points of use simultaneously, making it ideal for bathrooms and kitchens. The advanced combustion technology minimizes gas consumption and reduces operational noise for a more efficient and quieter experience.
Top 4
Best for LP
Best for Propane
Best for 60 Gallon
Best for 80 Gallon
Best for 30 Gallon
Best for 50 Gallon
Best for Takagi
Best for FOGATTI
Best for Eccotemp
Best for AO Smith
VEVOR Tankless Water Heater Propane, 4.3Gal Instant Water Heater, 100000 BTU, Silver Gray, Smart Temperature Control, Multiple Security Protections, Indoor Use for Whole House
VEVOR
JSQ30-B
13.78 x 13.78 x 21.65 inches
19.75 pounds
Efficient
Ratings for VEVOR (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
Enjoy Instant Hot Water: This 4.3Gal, 100,000 BTU/h tankless water heater powered by propane, lets you and your family say goodbye to cold water and enjoy constant, comfortable hot water for showers and more
±1℉ Precision Temperature Control: Smart sensors maintain the water temperature within ±1℉ of the set value, avoiding large fluctuations and ensuring a consistent and comfortable water temperature
Top 5
Best for Rinnai
Best for Propane
Best for High Efficiency
Best Gas Water Heaters
Best for Rinnai
Best for Tankless
Best for Noritz
Best for Rinnai
Best for 9 GPM
Best for 11 GPM
NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU
Rinnai
RX199iN
30.11 x 18.5 x 30.11 Inches
55.0 Pounds
High (UEF .98)
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| eFaucets | 9,712 | ❌ | ❌ | ❌ |
| EXPRESS DISTRIBUTION | - | ❌ | ❌ | ❌ |
| Voomi Supply | - | ❌ | ❌ | ❌ |
Features
One Model, Anywhere: This Rinnai tankless water heater is installable indoors or outdoors thanks to our new Versa Vent and powered by either propane or natural gas thanks to a Smart Sense gas control system; RX-OVC vent cap required for outdoor install
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This condensing propane and natural gas tankless water heater from Rinnai is only the size of a small suitcase, but provides up to 11.1 GPM (7 fixtures at once)
Top 6
Best Water Heaters
Best for Inline
Best for NG
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Tankless
Best for 3 GPM
Best for 4 GPM
Best for 5 GPM
Westinghouse Smart Tankless Water Heater Gas Indoor, 7.9 GPM 180,000 BTU Whole Home Natural Gas Heater, WiFi App Control, ±1°F Temperature Stability, Non-Condensing for 3-5 Fixtures
Westinghouse
HW180A0G-NG
17.1 x 17.1 x 26.2 inches
Ratings for Westinghouse (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
【Endless Hot Water for the Whole Home】Enjoy continuous instant hot water for showers, laundry, dishwashing, and daily household use. Delivering up to 7.9 GPM and 180,000 BTU, this whole house tankless water heater comfortably supports 3–5 fixtures simultaneously without sacrificing comfort or water pressure.
【Smart WiFi App Control】Control your indoor tankless water heater anytime through the smartphone app or LED display panel. Easily adjust water temperature, monitor operating status, and enjoy a smarter, more convenient hot water experience for your home.
Top 7
Best for Gas Powered
Best for Whole House
Best for Residential
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Tankless
Best for Takagi
Best for 2 GPM
Best for 5 GPM
ThermoMate CZ422NG Natural Gas Tankless Water Heater, Up to 5 GPM 113,000 BTU, High Efficiency Instant On-Demand Hot Water for Whole House Use, Indoor Residential Water Heater with Multi-Point Heating
thermomate
CZ422NG
13.77 x 13.77 x 21.65 inches
22.0 pounds
Ratings for thermomate (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| ThermoMate Official | - | ❌ | ❌ | ❌ |
Features
[Max 5 GPM & 113,000 BTU] - The ThermoMate instant hot water heater can supply two showers simultaneously, each delivering 105°F water at a flow rate of 2 GPM, based on an inlet water temperature of 65°F. No waiting time, no cold water shocks, perfect for busy households. Adopting advanced water flow sensor, the built-in chip can adjust the heating power 20,000 times per second, ensuring that the hot water within ±1℉ fluctuations for a comfortable shower experience.
[Safety & Reliable] - This gas tankless water heater integrates 8 protections: boil-dry, freeze, flame-out, overheating, over-temperature, pipe blockage, high-temperature lock, and excessive air pressure. Equipped with 4 ceramic heating cores, it auto-activates frost protection when temperatures hit 41°F (5℃). The energy-smart system uses minimal electricity to generate gentle warmth, preventing pipe ice buildup without high energy costs.
Propane Tankless Water Heater, 4.74GPM 18L Indoor,Constant propane water heater,Instant Hot Propane Gas water heater with Multi-Protection
VELPAX
HWRSQ-18L-001
13.8 x 13.8 x 21.7 Inches
Ratings for VELPAX (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| DIVACEN | - | ❌ | ❌ | ❌ |
Features
【Tankless Water Heater】– This propane tankless water heater features steady temperature control and multiple safety protections, including a flame failure device, anti-freeze protection, and overheating protection. It operates with just 3.6 PSI of water pressure, delivering up to 4.74 gallons of hot water per minute. With a maximum temperature rise of 65°C(149°F), this unit is designed exclusively for use with propane (LPG).
【Efficient & Energy-Saving】– With a high-performance output of 68,000 BTU per hour, this 4.74 GPM instant propane water heater provides on-demand hot water for 2–3 points of use simultaneously, making it ideal for bathrooms and kitchens. The advanced combustion technology minimizes gas consumption and reduces operational noise for a more efficient and quieter experience.
Top 9
Best for Inline
Best for Electric
Best for Digital
Best for Whole House
Best for 20 Gallon
Best for 100 Gallon
Best for Takagi
Best for Rheem
Best for Stiebel Eltron
Best for Rinnai
Best for EcoSmart
Best for FOGATTI
Best for GASLAND
Best for Eccotemp
Best for AO Smith
Best for 2 GPM
Best for 3 GPM
18kW Tankless Water Heater Electric, NOVIEEX 240V 3s Instant Hot Water Heater, Flow Rate Max 4.9 GPM, Supply for 2-3 Points, Indoor Installation, Ideal for Apartment, Garage, Salon, Bathroom, Kitchen
NOVIEEX
DS-18
11.14 x 11.14 x 15.86 inches
Ratings for NOVIEEX (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| NOVIEEX Global | - | ❌ | ❌ | ❌ |
| Woot | 118 | ❌ | ❌ | ❌ |
Features
【MEDIUM HOME SOLUTION】 The NOVIEEX 18kW electric tankless water heater is specifically engineered for small-to-medium-sized homes, condos, and apartments with 2-3 simultaneous water needs. Its sleek, ultra-thin wall-mount profile (11.14" x 15.86" x 3.18") frees up 80% more space compared to obsolete, bulky storage tanks, maximizing spatial efficiency in your basement, utility closet, or garage.
【HIGH CAPACITY FLOW】 It delivers a powerful water flow rate of up to 4.9 Gallons Per Minute (GPM). This high capacity easily accommodates multiple running fixtures at once, allowing family members to run a shower, wash dishes in the kitchen sink, and operate the laundry machine concurrently without any drop in temperature or water pressure.
CAMPLUX Climatech 7 102000 BTU(Real Data No Exaggeration) Tankless Water Heater Propane 4.22 GPM(Up to 5 GPM), CSA Certified On Demand Instant Tankless Hot Propane Water Heater Indoor, 2-4 Outlets
CAMPLUX ENJOY OUTDOOR LIFE
CA422WLP-CA
13.8 x 13.8 x 6.7 Inches
24.3 Pounds
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Camplux | - | ❌ | ❌ | ❌ |
Features
𝐔𝐩 𝐭𝐨 𝟓 𝐆𝐏𝐌 𝐏𝐫𝐨𝐩𝐚𝐧𝐞 𝐖𝐚𝐭𝐞𝐫 𝐇𝐞𝐚𝐭𝐞𝐫: Indoor propane tankless water heaters provides 102, 000 BTU endless hot water on demand for 3 - 4 water points. Up to 5 GPM, each delivering 105°F water at a flow rate of 2 GPM, based on an inlet water temperature of 65°F. No waiting time, no cold water shocks, perfect for busy households, saving time and convenience. Suitable for Whole house, Tiny home, Mobile home, Apartment, Rental property (for rent), RV, Cabin.
𝐄𝐧𝐞𝐫𝐠𝐲 𝐄𝐟𝐟𝐢𝐜𝐢𝐞𝐧𝐜𝐲 𝐚𝐧𝐝 𝐅𝐮𝐞𝐥 𝐒𝐚𝐯𝐢𝐧𝐠𝐬: Tankless hot water heater propane maintains temperature fluctuations within ±1℉, ensures precise hot water control with advanced sensors and smart chip with 1,000s calculation for consistent comfort shower. Premium Copper Core = Lasting Efficiency. Built with pure copper for fast heating and corrosion-free durability. Switch between 4 smart modes to match seasons—cut energy costs year-round.
Top 11
Best for Rheem
Best for Propane Liquid
Best for Rheem
Best for 50 Gallon
Best for 75 Gallon
Best for Takagi
Best for Rheem
Best for Rinnai
Best for AO Smith
Best for 3 GPM
Best for 7 GPM
Rheem RTG-70DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater 7.0 GPM, 160,000 BTUs
Rheem
RTG-70DVLP-3
10.27 x 13.5 x 24.2 inches
46.5 pounds
0.82
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
| HTRM INC. | - | ❌ | ❌ | ❌ |
Features
High-efficiency tankless gas water heater delivers up to 7.0 GPM, perfect for 2–3 bathroom homes with multiple hot water needs like showers and laundry.
Powered by liquid propane with 160,000 BTUs, this durable tankless unit ensures fast, reliable hot water—even during peak household demand.
Top 12
Best for Rheem
Best for Residential
Best for High Efficiency
Best for Rheem
Best Gas Water Heaters
Best for 50 Gallon
Best for 75 Gallon
Best for Tankless
Best for 50 Gallon
Best for Takagi
Best for Noritz
Best for Rheem
Best for Rinnai
Rheem RRTGH84DVLN3701171 Rheem RTGH Series 8.4 GPM 157,000 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel
Rheem
RTGH-84DVLN-3
9.8 x 17.7 x 23.7 inches
59.88 Pounds
Super High Efficiency
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| MTL Retailers | - | ❌ | ❌ | ❌ |
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
Flow rate of 0.4 - 8.4 GPM
Available temperature settings range from 100 to 140F (default setting of 120F)
Rinnai RE180iN Non-Condensing Natural Gas Tankless Water Heater, Up to 8.5 GPM, Indoor Installation, 180,000 BTU
Rinnai
REU-VE2432FFD-US-N
10.77 x 14.05 x 27.28 inches
54.0 Pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
| Buildcom | 972 | ❌ | ❌ | ❌ |
| eFaucets | 9,712 | ❌ | ❌ | ❌ |
Features
Smart Design: Improved design of tankless hot water heater only heats when necessary to conserve energy; Speeds installation and enhances serviceability with a cleaner internal layout; LED screen provides service reminders and error codes
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This non-condensing indoor tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 6.9 GPM (5 fixtures at once)
Top 14
Best for Rheem
Best for High Efficiency
Best for Rheem
Best for Rheem
Best for 10 GPM
Best for 15 GPM
Rheem RRTGH95DVLP3701178 Rheem RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Liquid Propane Tankless Water Heater Stainless Steel
Rheem
RTGH-95DVLP-3
9.8 x 17.7 x 23.7 inches
59.88 pounds
0.82
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
Flow rate of 0.4 - 9.5 GPM
Available temperature settings range from 100 to 140F (default setting of 120F)
Top 15
Best for CAMPLUX
Best for LP
Best for Wall
Best for GASLAND
Best for Eccotemp
Best for CAMPLUX
Best for 3 GPM
Best for 9 GPM
CAMPLUX Climatech 3 Tankless Water Heater Propane, 65,000 BTU Propane On Demand Hot Water Heater, Max 2.64 GPM, Indoor Installation, CX264, White
CAMPLUX ENJOY OUTDOOR LIFE
CX264WLP
5.9 x 5.9 x 21.3 Inches
19.1 Pounds
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Camplux | - | ❌ | ❌ | ❌ |
Features
【2.64 GPM Propane Water Heater】CAMPLUX propane tankless water heater delivers endless hot water on demand for 1-2 water points, which is perfect for small living spaces such as tiny houses, mobile homes, and apartments
【Compact Design】CX264 gas tankless water heater save over 200% of available space compared to tank water heaters
Ranein Natural Gas Tankless Water Heater, Indoor Max 5.3 GPM, 130,000 BTU Instant Hot Water Heater
Ranein
RH13K-NG
14.15 x 14.15 x 23.15 Inches
38.0 pounds
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Ranein Store | - | ❌ | ❌ | ❌ |
| Woot | 118 | ❌ | ❌ | ❌ |
Features
Fans Placed Underneath: It will be more secure in terms of safety, and no smoke backflow will occur. The blower has large power and can automatically adjust the rotating speed according to the change of external wind pressure and the change of water temperature to provide sufficient oxygen for gas combustion, ensuring full combustion and safer use. Low noise and longer service life.
No Waiting Required: Unlike traditional tank water heaters, tankless water heaters eliminate the need for a 30-minute preheating wait time, allowing you to have unlimited hot water on demand.
Top 17
Best for Residential
ThermoMate CZ422LP, Propane Tankless Water Heater, Up to 5 GPM 113,000 BTU, High Efficiency Instant Hot Water for Whole House Use, Indoor Residential on Demand Water Heater with Multi-Point Heating
thermomate
CZ422LP
13.77 x 13.77 x 21.65 inches
22.0 pounds
Ratings for thermomate (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| ThermoMate Official | - | ❌ | ❌ | ❌ |
Features
[Max 5 GPM & 113,000 BTU] - The ThermoMate instant hot water heater can supply two showers simultaneously, each delivering 105°F water at a flow rate of 2 GPM, based on an inlet water temperature of 65°F. No waiting time, no cold water shocks, perfect for busy households. Adopting advanced water flow sensor, the built-in chip can adjust the heating power 20,000 times per second, ensuring that the hot water within ±1℉ fluctuations for a comfortable shower experience.
[Safety & Reliable] - This gas tankless water heater integrates 8 protections: boil-dry, freeze, flame-out, overheating, over-temperature, pipe blockage, high-temperature lock, and excessive air pressure. Equipped with 4 ceramic heating cores, it auto-activates frost protection when temperatures hit 41°F (5℃). The energy-smart system uses minimal electricity to generate gentle warmth, preventing pipe ice buildup without high energy costs.
GASLAND Compact Propane Tankless Water Heater Indoor, Up to 4 GPM 98,500 BTU On Demand Instant Hot Water Heater, Ultra Quiet, More Stable Temp for Apartment,Tiny House, CG360LP
GASLAND
CG360LPN3
15.1 x 15.1 x 9.4 inches
Ratings for GASLAND (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Gasland | - | ❌ | ❌ | ❌ |
Features
【Exceptional Temperature Stability】Enjoy steady hot water from every faucet—even with multiple taps running at once. This indoor propane water heater system keeps the temperature constant regardless of changes in water pressure or weather. Plus, hot water restarts instantly after turning the tap back on—no waiting, no fluctuations.
【Precision Temperature Control (±0.5°F)】Our propane tankless water heater features cutting-edge flow sensors and a high-speed smart chip that performs thousands of calculations per second. This ensures water temperature stays within ±0.5°F of your setting—providing unmatched comfort and consistency.
Ranein Natural Gas Tankless Water Heater, Indoor Max 4.3 GPM, 100,000 BTU Instant Hot Water Heater
Ranein
RH10K
16.9291 x 16.9291 x 25.5906 inches
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Ranein Store | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Powerful On-Demand Heating: 100,000 BTU & 4.3 GPM for this tankless water heater gas, supports 3-4 water points simultaneously, delivers endless hot water on demand with no waiting.
4 Intelligent Preset Modes: One-click switch for 4-season/Kitchen/Bathtub/Shower modes; 4-season auto-matches temp, kitchen defaults to 100°F, bathtub supports 50-800L volume adjustment.
CAMPLUX Climatech 3 Tankless Water Heater Propane 3.6 GPM, 82,000 BTU High Efficiency Instant On-Demand Hot Water, 2-3 Points Gas Tankless Water Heater Indoor, White, CX360
CAMPLUX ENJOY OUTDOOR LIFE
CX360WLP
6.8 x 6.8 x 21.3 Inches
20.5 pounds
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
3.6 GPM & 82,000 BTU: CX360 propane tankless water heater delivers consistent hot water to 2-3 fixtures simultaneously, you can get unlimited hot water on demand. No need to wait, no cold water shocks
Easy Installation: CX360 propane gas water heater tankless features standard 3/4" NPT water inlet/outlet connectors, a 1/2" NPT gas inlet, a 3" OD vent, and a UL-approved 120V plug, ensuring compatibility with most households. Matches with CAMPLUX vent kit VP70T and valve kit VK75.
Top 21
Best for Gas Powered
Best Gas Water Heaters
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
GEN II Ranein Natural Gas Tankless Water Heater Max 3.6 GPM, 80,000 BTU Indoor On Demand Instant Hot Water Heater with LED Temperature Control Panel
Ranein
RH8K-NG
13.8 x 13.8 x 21.7 inches
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Vancepic WarmHome Mall | - | ❌ | ❌ | ❌ |
| Woot | 118 | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Endless Hot Water for Home Multi-Scenes: Boasts a max 3.6 GPM and 80,000 BTU for 2–3 taps (shower + kitchen sink + bar)—no more hot water shortages for daily household use.
No Sudden Temp Changes, Stable Experience: Advanced tech maintains steady water temperature; no sudden spikes or drops—ideal for showering or bathing infants comfortably.
Top 22
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 75 Gallon
Best for 80 Gallon
ORBEK Tankless Water Heater Natural Gas Indoor, 4.3 GPM 100,000 BTU Instant Hot Water Heater for 2-3 Fixtures, CSA Certified Non-Condensing On Demand Water Heater with LED Display
Orbek
HW100
13.0 x 13.0 x 20.5 inches
Ratings for Orbek (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
【Instant Endless Hot Water】ORBEK natural gas tankless water heater delivers up to 4.3 GPM and 100,000 BTU heating power, providing continuous on-demand hot water for showers, kitchens, and daily household use. Supports 2-3 fixtures simultaneously without waiting for a storage tank to refill
【Stable Temperature Within ±1°F】Built-in smart temperature control system adjusts heating performance in real time to maintain stable water temperature within ±1°F. Advanced low water pressure startup at only 0.53 GPM ensures reliable hot water even under low-flow conditions
ThermoMate CZ480NG 5.28GPM Condensing Tankless Water Heater, 0.86 UEF High Efficiency Instant On-Demand Hot Water, Residential Indoor Natural Gas Water Heater with Multi-Point Heating
thermomate
CZ480NG
13.77 x 13.77 x 21.65 inches
26.0 Pounds
Ratings for thermomate (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| ThermoMate Official | - | ❌ | ❌ | ❌ |
Features
[Save 15% & Dual Heat Exchanger] - With potential savings of 15% compared to non-condensing units, this condensing tankless water heater delivers outstanding 0.86 UEF efficiency, dramatically reducing energy usage and operational expenses. This performance is made possible by an innovative dual heat exchange system, which combines a corrosion-resistant stainless steel condensing heat exchanger with a highly conductive oxygen-free copper heat exchanger, captures and reuses waste heat that conventional units lose, to maximize heat recovery.
[5.28 GPM & 114,000BTU] - The ThermoMate instant hot water heater can supply two showers simultaneously, each delivering 105°F water at a flow rate of 2 GPM, based on an inlet water temperature of 65°F. No waiting time, no cold water shocks, perfect for busy households. Adopting advanced water flow sensor, the built-in chip can adjust the heating power 20,000 times per second, ensuring that the hot water within ±1℉ fluctuations for a comfortable shower experience.
Top 24
FOGATTI Propane Gas Tankless Water Heater Indoor - Max 5.1 GPM 120,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 120S Series
FOGATTI
InstaGas Comfort
15.5 x 15.5 x 23.9 inches
Ratings for FOGATTI (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
Powerhouse Performance: The FOGATTI tankless water heater takes up a third of the space of traditional tank heaters but delivers 5 times the performance. With a high heating power of 120,000 BTU and a flow rate of 5.1 GPM, it provides endless hot water on demand, perfect for multitasking households
Instant Heating: Unlike traditional tank heaters, this tankless water heater propane delivers instant and endless hot water as water flows through. Whether it’s for showers, sinks, or appliances, even for 2-4 outlet points, it ensures uninterrupted hot water whenever you need it
Top 25
Best for 40 Gallon
MIZUDO Natural Gas Tankless Water Heater, Indoor or Outdoor Convertible Installation, Max 5.1 GPM 120,000 BTU, WiFi&APP Control CSA Certified for Large Families Whole House, GEN 3
MIZUDO
FDG-CS120AW-NG
14.56 x 14.56 x 22.83 inches
Ratings for MIZUDO (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Mizudo Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
[Flexible Indoor&Outdoor Installation Solution]: Mizudo innovative natural gas tankless water heater indoor offers versatile installation options to meet various home configurations. Convert from indoor to outdoor use with accessory kits (Purchase Required), providing homeowners unprecedented flexibility for space utilization
[Smart WiFi and App Control]: Manage your tankless water heater gas remotely through the dedicated mobile application. Adjust temperature settings, monitor energy usage, and receive maintenance notifications from anywhere
Rinnai RE140iN Non-Condensing Natural Gas Tankless Water Heater, Up to 5.3 GPM, Indoor Installation, 140,000 BTU
Rinnai
REU-VE1720FFD-US-N
10.77 x 14.05 x 27.28 inches
50.7504 pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ✅ | ✅ | ✅ |
| eFaucets | 9,712 | ❌ | ❌ | ❌ |
Features
Smart Design: Improved design of tankless hot water heater only heats when necessary to conserve energy; Speeds installation and enhances serviceability with a cleaner internal layout; LED screen provides service reminders and error codes
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This non-condensing indoor tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 5.3 GPM (5 fixtures at once)
Top 27
Best for Residential
ThermoMate Propane Tankless Water Heater, Up to 3.06 GPM High-Efficiency Instant Hot Water for Bathroom & Kitchen, 75,000 BTU Residential Indoor on-Demand Hot Water Heater, CZ264LP
thermomate
CZ264LP
28.1496 x 15.9449 x 9.8425 inches
Ratings for thermomate (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| ThermoMate Official | - | ❌ | ❌ | ❌ |
Features
[Max 3.06 GPM & 75,000 BTU] - The ThermoMate instant water heater reliably delivers a comfortable single shower (2 GPM at 105°F) even when inlet water is as low as 52°F. If the summer inlet temperature reaches 65°F, it maintains full shower performance and can additionally supply a faucet at 0.5 GPM. No waiting time, no cold water shocks, perfect for the bathroom or kitchen.
[Safety & Reliable] - This gas tankless water heater integrates 8 protections: boil-dry, freeze, flame-out, overheating, over-temperature, pipe blockage, high-temperature lock, and excessive air pressure. Equipped with 4 ceramic heating cores, it auto-activates frost protection when temperatures hit 41°F (5℃). The energy-smart system uses minimal electricity to generate gentle warmth, preventing pipe ice buildup without high energy costs.
Top 28
Best for High Efficiency
Best Gas Water Heaters
Best for Fogatti
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Best for 40 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Tankless
Best for Takagi
Best for FOGATTI
Best for AO Smith
Best for 7 GPM
FOGATTI Natural Gas Tankless Water Heater Indoor - Max 7.5 GPM 170,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 170S Series
FOGATTI
InstaGas Comfort
17.1 x 17.1 x 26.2 inches
Ratings for FOGATTI (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Powerhouse Performance: The FOGATTI tankless water heater takes up a third of the space of traditional tank heaters but delivers 5 times the performance. With a high heating power of 170,000 BTU and a flow rate of 7.5 GPM, it provides endless hot water on demand, perfect for multitasking households
Instant Heating: Unlike traditional tank heaters, this tankless water heater gas delivers instant and endless hot water as water flows through. Whether it’s for showers, sinks, or appliances, even for 3-5 outlet points, it ensures uninterrupted hot water whenever you need it
Top 29
Best for 4 GPM
Propane Gas Tankless Water Heater, Indoor Max 4.3 GPM, 100,000 BTU On Demand Instant Hot Water Heater Propane Gas with LED Temperature Control Panel, 1/2" NPT Connector Size, Gray 4.3 P1
LiberLive
HKRV-HR2109
14.2 x 14.2 x 22.1 inches
Ratings for LiberLive (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| LiberLive Store | - | ❌ | ❌ | ❌ |
| Woot | 118 | ❌ | ❌ | ❌ |
Features
Powerful On-Demand Heating – This tankless water heater gas delivers 100,000 BTU & 4.3 GPM, supporting 3–4 water points simultaneously (shower + kitchen sink + bar sink + more). Enjoy endless tankless hot water heater performance with no waiting – perfect for daily household use
Precision Temperature Stability – Unlike conventional gas water heater units, our propane water heater eliminates sudden hot/cold spikes. Adjustable range (95°F–149°F) ensures consistent warmth, safe for infants, kids, and elders – no more unexpected cold blasts
Top 10 Indoor Water Heaters - Verified to Buy (September 2026)
- 1. Bosch Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5)...
- 2. NEW Rinnai RX130iN Condensing Smart Sense Natural Gas or Propane...
- 3. Propane Tankless Water Heater, 4.21GPM 16L Indoor, Constant propane water...
- 4. VEVOR Tankless Water Heater Propane, 4.3Gal Instant Water Heater, 100000...
- 5. NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane...
- 6. Westinghouse Smart Tankless Water Heater Gas Indoor, 7.9 GPM 180,000...
- 7. ThermoMate CZ422NG Natural Gas Tankless Water Heater, Up to 5...
- 8. Propane Tankless Water Heater, 4.74GPM 18L Indoor,Constant propane water heater,Instant...
- 9. 18kW Tankless Water Heater Electric, NOVIEEX 240V 3s Instant Hot...
- 10. CAMPLUX Climatech 7 102000 BTU(Real Data No Exaggeration) Tankless Water...
Top 10 Indoor Water Heaters Brands on Amazon
Here is the list of top-rated brands that were evaluated by CherryPicks.
- Bosch
- Rinnai
- VELPAX
- VEVOR
- Westinghouse
- thermomate
- NOVIEEX
- CAMPLUX ENJOY OUTDOOR LIFE
- Rheem
- Ranein
Related Indoor Water Heaters Guides
For more personalized Indoor Water Heaters guides, Check those pages,
MOUNTING LOCATION
Top 10 Indoor Water Heaters Sellers: CPR Seller Rank List
CPR sellers rank is based on CherryPicks-AI bestselling ranking system that helps us analyze each seller's sales trends. The List of top seller ranks is our in-house data, essential for our product ranking to help you make the right shopping choice.
- 1. Woot : 264,925 Yearly Feedback , Avg. Ratings 4.8
- 2. Buildcom : 51,606 Yearly Feedback , Avg. Ratings 4.5
- 3. eFaucets : 7,050 Yearly Feedback , Avg. Ratings 4.4
- 4. Camplux : 2,734 Yearly Feedback , Avg. Ratings 4.7
- 5. Voomi Supply : 2,260 Yearly Feedback , Avg. Ratings 4.1
- 6. Gasland : 1,801 Yearly Feedback , Avg. Ratings 4.6
- 7. MTL Retailers : 498 Yearly Feedback , Avg. Ratings 4.1
- 8. Mizudo Home Comfort Direct : 401 Yearly Feedback , Avg. Ratings 4.7
- 9. Amazon.com : 386 Yearly Feedback , Avg. Ratings 4.7
- 10. ThermoMate Official : 371 Yearly Feedback , Avg. Ratings 4.7
| Rank | Name | Yearly Feedbacks | Avg. Ratings |
|---|---|---|---|
| 🥇 | Woot | 264,925 | 4.8 |
| 🥈 | Buildcom | 51,606 | 4.5 |
| 🥉 | eFaucets | 7,050 | 4.4 |
| 4 | Camplux | 2,734 | 4.7 |
| 5 | Voomi Supply | 2,260 | 4.1 |
| 6 | Gasland | 1,801 | 4.6 |
| 7 | MTL Retailers | 498 | 4.1 |
| 8 | Mizudo Home Comfort Direct | 401 | 4.7 |
| 9 | Amazon.com | 386 | 4.7 |
| 10 | ThermoMate Official | 371 | 4.7 |
[Get] Indoor Water Heaters Deals (✅Exclusively for Prime)
What does "Amazon Fulfilled" Mean?
Amazon Fulfilled refers to products handled by Amazon's logistics, which indicates that the product is stored, packed, and shipped by Amazon from one of its fulfillment centers.
When you order a product that is "Amazon Fulfilled," Amazon takes care of the storage, packing, shipping, and customer service for that product. This often ensures quicker delivery and better customer service compared to products that are not fulfilled by Amazon. It also means that the product is eligible for Amazon's return policy.
What does "Prime" Mean?
"Prime" refers to Amazon Prime Member (Join Amazon Prime Now), which indicates eligibility for Prime benefits. When you see "Prime" next to a product on Amazon, This generally means that if you are an Amazon Prime member, you can get free two-day shipping on that product, and sometimes even same-day or one-day shipping depending on your location.
Prime members also have access to other benefits, including 2-Day Shipping, Exclusive Member Deals, Prime Video, Buy With Prime, Amazon Music, Prime Gaming, and more.
Shop Prime Indoor Water Heaters Deals
What does "Free Shipping" Mean?
"Free Shipping" means that you will not be charged additional fees for the shipping of that product. However, unlike "Prime," which usually guarantees fast two-day shipping, "Free Shipping" doesn't necessarily mean fast shipping.
Sometimes there might be a minimum purchase requirement to qualify for free shipping if you are not a Prime member. For Prime members, the "Free Shipping" usually refers to the free two-day shipping that is one of the benefits of the Prime membership.
Why Should You Trust Us?
Now hundreds and thousands of Rough Plumbing supplies are available on Amazon, Picking the right one is not easy, and that may take a lot of your time, Right? and What is the best Indoor Water Heaters to buy for new September 2026?
CherryPicks’s Methodology for Evaluating Indoor Water Heaters
We developed the CherryRatings-AI system to identify and score reviews and the CherryPicks-AI ranking system that uses TensorFlow framework to generate the best list, It will help us evaluate Rough Plumbing items that sell on Amazon. The score of items is based on over ten parameters such as analyzing customer review content, product reviewing rating statistics, brand reputation evaluation, comparing product price with features, etc, You can visit How We Rank to learn more in detail.
We collected and analyzed 306 of Indoor Water Heaters reviews based on our selection criteria. It helped us shortlist the top qualified and rated Indoor Water Heaters for Rough Plumbing, We found that most customers choose Indoor Water Heaters with an average price of $599.16, and the top brands are VEVOR, Westinghouse, CAMPLUX ENJOY OUTDOOR LIFE, Rheem, GASLAND, thermomate, Rinnai And FOGATTI.
Then our expert-level editors reviewed all those quality items and selected the top 29 Indoor Water Heaters for you, We have researched hundreds of sellers and picked the top sellers for Rough Plumbing, including Amazon Resale, Woot, Buildcom, eFaucets, Camplux, Voomi Supply, Gasland, MTL Retailers, Mizudo Home Comfort Direct, Amazon.com, ThermoMate Official And Westinghouse Home Comfort Direct. The Bosch Electric Mini-Tank Water Heater Tronic 30... are available for purchase right now, and The seller of #1 rank product has received honest feedback from 11,246 consumers with an average rating of 4.3.
We've helped a lot of satisfied users get the right Tools & Home Improvement product based on their needs, and save lots of time for them to pick Indoor Water Heaters to buy.
Hunter Lambrick is a contributing writer on the Cherrypicksreview platform who specializes in writing articles on outdoor events and home tool products. He has been doing this for a while now and has developed a wealth of experience in it.