10 Best Gas Tankless Water Heaters

After analyzing products, scanning reviews, spending more than 36 hours of research and speaking with our test users, we think the Rinnai V Series HE Tankless Hot Water Heater: Indoor Installation is the one of the Best Gas Tankless Water Heater on the market.

# Image Name Brand Price
1
⭐Best Choice
Rinnai V Series HE Tankless Hot Water Heater: Indoor Installation
Rinnai V Series HE Tankless Hot Water Heater: Indoor Installation Check price Rinnai $$$$$ Check price
2
💲Best value for the money
Eccotemp i12-NG Tankless Water Heater
Eccotemp i12-NG Tankless Water Heater Check price Eccotemp $$$$$ Check price
3
Best under $1000
Rinnai V Series HE Tankless Hot Water Heater: Outdoor Installation
Rinnai V Series HE Tankless Hot Water Heater: Outdoor Installation Check price Rinnai $$$$$ Check price
4 EcoSmart ECO 27 Electric Tankless Water Heater EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology Check price Ecosmart $$$$$ Check price
5 Rheem RTG-84XLN-1 Tankless Water Heater Rheem RTG-84XLN-1 Tankless Water Heater, Grey Check price Rheem $$$$$ Check price
6
👑Premium Pick
Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater
Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater, Twin Pipe Check price Rinnai $$$$$ Check price
7 VEVOR Natural Gas Hot Water Heater 18L Tankless Instant Boiler VEVOR Natural Gas Hot Water Heater 18L Tankless Instant Boiler 4.8GPM Liquefied Natural Gas Water Heater 36KW Stainless Steel with Shower Head Wall-Mounted Water Heater Check price VEVOR $$$$$ Check price
8 Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater, 10-Gallon Per Minute Check price TAKAGI $$$$$ Check price
9 Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater, small, GREY Check price Rheem $$$$$ Check price
10 Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House and for Hydronic heating Compare to Rinnai, Rheem,Noritz, Bosch FREE FLUE KIT Check price GASFLEX $$$$$ Check price

Rinnai V Series HE Tankless Hot Water Heater: Indoor Installation – Best Overall Gas Tankless Water Heater

Rinnai V Series HE Tankless Hot Water Heater: Indoor Installation
  • Endless hot water for your entire home
  • V65iN HE High Efficiency Tankless Hot Water Heater - Natural Gas: Indoor Installation Only
  • Up to 6.5 GPM hot water flow rate (varies by groundwater temp)
  • Control-R 2.0 mobile app features timers and schedules throughout the day and allows you to remotely put the system into vacation mode.
  • Residential Factory Warranty - 120 months (heat exchanger), 12 months (labor), 60 months (parts)

Eccotemp i12-NG Tankless Water Heater – Best Budget Gas Tankless Water Heater

Eccotemp i12-NG Tankless Water Heater
  • Whole home indoor, gas powered tankless water heater, rated at 3 GPM that activates only on demand and no pilot light needed, reducing energy consumption
  • Sleek, modern design with black tempered glass front panel featuring an easy to use LED display controls
  • Features fully automatic temperature controls with an energy saving mode and child lock technology
  • Safe electronic ignition system; Plugs into standard 110v electrical outlet with UL-listed cord. Field tested to 5500 ft. elevation (not recommended to be used any higher)
  • Uses standard 1/2" NPT water fittings and comes with horizontal venting allowing for a convenient and quick installation

Rinnai V Series HE Tankless Hot Water Heater: Outdoor Installation – Best under $1000

Rinnai V Series HE Tankless Hot Water Heater: Outdoor Installation
  • Endless hot water for your entire home
  • V65eN HE High Efficiency Tankless Hot Water Heater - Natural Gas: Outdoor Installation Only
  • Up to 6.5 GPM hot water flow rate (varies by groundwater temp)
  • Control-R 2.0 mobile app features timers and schedules throughout the day and allows you to remotely put the system into vacation mode.
  • Residential Factory Warranty - 120 months (heat exchanger), 12 months (labor), 60 months (parts)

EcoSmart ECO 27 Electric Tankless Water Heater

EcoSmart ECO 27 Electric Tankless Water Heater
  • Savings of up to 50% on water heating costs. Dimensions :17H x 17W x 3.625D inches ;Pipes fittings :3/4 inch NPT
  • Digital temperature control in 1-degree increments allows control of hot water; Activation Flow: 0.3 GPM
  • Copper and stainless components designed for efficiency, durability and easy replacement.
  • Compact size saves valuable storage space, while the stylish and advanced design is pleasing to the eye and Copper and stainless components designed for efficiency, durability and easy replacement.
  • Prior to purchase & installation, please verify that this model is the right size for your hot water needs and electrical requirements. Electrical requirements: 27 kW, 240 volts, (3) 40 required breakers, 112.5 maximum power (AMP), (3) 8 required wire.Amperage Draw:113 A
  • Required Breaker Quantity: Three 40 Amp Double Pole
  • Recommended Electrical Panel: 200 Amps
  • NEVER run out of hot water with an ECOSMART tankless water heater.
  • Save up to 12 cubic feet of storage space.
  • Digital temperature control in 1-degree increments gives users complete control of hot water

Rheem RTG-84XLN-1 Tankless Water Heater

Rheem RTG-84XLN-1 Tankless Water Heater
  • Exclusive Water Savings technology conserving up to 1, 100 gallons per year
  • 157, 000 BTU (gas consumed per hour)
  • Exclusive Hot Start Programming minimizes cold water burst by staying in ready-fire state
  • Recirculation pump ready kit ready
  • For use outdoors with freeze protection up to -30 degrees

Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater – Premium Pick

Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless Water Heater
  • INDOOR installation only. Fuel Type: NATURAL GAS.
  • Concentric or PVC venting option
  • Up to 0.96 Energy Factor/Up to 0.92 Uniform Energy Factor
  • The space-saving design allows Indoor Installation type
  • Ultra low NOx emissions
  • 199,000 max BTU

VEVOR Natural Gas Hot Water Heater 18L Tankless Instant Boiler

VEVOR Natural Gas Hot Water Heater 18L Tankless Instant Boiler
  • 【 VEVOR Natural Gas Water Heater】Water heaters parameter:Gas type: Natural Gas,Water flow rate: 12 L/min,Heat load: 24 KW,Rate gas pressure: 2000 Pa,Suitable Water Pressure: 0.02-0.8MPa,water pipeline:G1/2" steel tube,Ignition mode: 2 qualified 1.5V batteries (No included batteries).
  • 【Energy-Saving and Combustion Technology】The tankless gas water heater adopt advanced energy-saving and combustion technology to decrease gas consumption and burning noise,Compact and light weight structure with 11.5% energy saving technology,Compact size and lightweight design for easily carry.
  • 【Multi Protection】The gas hot water heater adopt heat resistant metal body,Low water pressure startup function,High efficient energy saving,Anti-freezing protection function,Over heat protection,Over water pressure protection function,Low water-pressure startup,Stable water flowing under high pressure,Automatic IC ignition system(No included batteries).
  • 【LED Screen and Stainless Steel Body】The instant water heater use adjusting knob controller,adjust the temperature as needed,Power Off Automatically when heater opening over 20 Minutes. Over heat Protection that the water heater will be automatically turned off over 75 °C .Please Note:Depending on the temperature of the environment ,heat time may be prolonged and flow may be slightly smaller, that is normal.
  • 【Application Environment and Note】The portable hot water heater suit for the household,offering you a relaxing shower at home.Note:The type of water heater is only suitable for natural gas. Please confirm the gas type before buying! Do not install the water heater in the bathroom!

Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water

Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water
  • Endless hot water, On-demand usage, Compact, Space saving, Energy conservation
  • Computerized safety features, No pilot light to have to worry about
  • Satisfies the 2012 SCAQMD Rule 1146.2 for Ultra-Low NOx Emissions

Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater

Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater
  • External digital thermostatic control with LED display (+/1 degree accuracy)
  • Most advanced self-modulation, adjust power to meet hot water demand
  • Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
  • Simple installation - bottom 3/4 inch NPT water connections
  • Threaded for easy replacement, simple installation, digital temperature display

Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM

Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM
  • Modulates heat output in response to the flow rate of water running through the unit.
  • Power vented directly vertically (rooftop) or sideways (wall) via Stainless Steel CAT III Flue 3.5" Diameter Included (20")
  • NATURAL GAS - European Model - Digital Display is in Celsius
  • Delivers 6.6 gpm of hot water with a 35°F Instant Temperature Rise (Equivalent to 5.5gpm with a 45F temp Rise)
  • Certified for Installation in Manufactured (Mobile) Homes Pure Copper Heat Exchanger

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