10 Best Gas Tankless Water Heaters 2020

Gareth Otwell Reviewed by Gareth Otwell | Last Updated:

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.

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)

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)

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

EcoSmart ECO 27 Electric Tankless Water Heater – Best under $500

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

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

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 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 RL Series HE+ Tankless Hot Water Heater: Indoor Installation

Rinnai RL Series HE+ Tankless Hot Water Heater: Indoor Installation
  • Endless hot water for your entire home
  • RL94iN HE+ High Efficiency Tankless Hot Water Heater - Natural Gas: Indoor Installation Only
  • Up to 9.4 GPM hot water flow rate (varies by groundwater temp)
  • Circ-Logic technology allows you to set recirculation patterns that coincide with your typical habits. Hot water is available when you need it!
  • Residential Factory Warranty - 120 months (heat exchanger), 12 months (labor), 60 months (parts).10,300 BTU (Minimum) / 199,000 BTU (Maximum)

Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water – Best under $200

Marey GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water
  • Provide endless hot water on demand and only as needed
  • Save up to 60% on electricity bills for water heating
  • Compact design saves space and is easy to install almost anywhere
  • No electrical connection is required so it's perfect alternative for those homes experiencing frequent power outages
  • Unlimited hot water whenever is needed
  • 5-year
  • Allows water temperature to be controlled
  • Rustproof, no water loss due to leaks
  • Works easily with low levels of water pressure

Camplux 10L 2.64 GPM High Capacity Tankless Natural Gas Residential

Camplux 10L 2.64 GPM High Capacity Tankless Natural Gas Residential
  • [Ease to Use] For whole home on demand indoor use with safe, efficient power ventilation ,perfect for any small homes, cabins or apartments.
  • [Modern Design] Exclusive color digital temperature display for easy to read.
  • [Saving More Energy] Eco and Full gas switch for energy saving and get ideal hot water temperature.
  • [More Safety] Flame-out protection, anti-freezing protection, over-heating protection, air flow pressure switch protection to ensure the safety.
  • [Controls Water Temperature Easily ] Uses standard 1/2" NPT water fittings and is equipped with easy to use manual water temperature controls.

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