Gas & Electric Tankless Water Comparison Charts

Tankless Water Heater Buyer's Guide Home >>> Gas and Electric Comparison Charts

Below we have provided comparison charts for all of our gas and electric tankless water heaters. Gas tankless water heaters tend to be more powerful and energy efficient that their electric tankless water heater counterparts. Gas models also require that you have natural gas or liquid propane coming into your home. They also require exernal ventilation which requires more in depth installation. Electric tankless water heaters do not require any type of venting, so installation tends to be less expensive. They are less efficient than gas models and do not produce as much hot water as their gas counterparts.

Gas Tankless Water Comparison Chart Model RTG53 RTG74 GT199 Showers 2 2-3 2-3 BTU's 145,000 199,000 199,000 GPM @ 90° F Rise 2.6 gpm 3.7 gpm 3.7 gpm GPM @ 80° F rise 3.0 gpm 4.1 gpm 4.1 gpm GPM @ 70° F rise 3.4 gpm 4.7 gpm 4.7 gpm GPM @ 60° F rise 3.9 gpm 5.5 gpm 5.5 gpm GPM @ 50° F rise 4.7 gpm 6.6 gpm 6.6 gpm GPM @ 45° F rise 5.3 gpm 7.4 gpm 7.4 gpm Temperature Range 100-140 degrees 100-140 degrees 100-180 degrees Venting Diameter 3 Inch Stainless 4 Inch Stainless 4 Inch Stainless Annual Operating Costs $167 NG  $246 LP $167 NG  $246 LP $167 NG  $246 LP Energy Factor .82 .82 .82 Gas Connection 3/4" NPT 3/4" NPT 3/4" NPT Water Connection 3/4" NPT 3/4" NPT 3/4" NPT Water Pressure 14 PSI 14 PSI 14 PSI Minimum Flow to Activate 0.66 gpm 0.66 gpm 0.66 gpm Max Hot Water Output 5.3 gpm 7.4 gpm 8.5 gpm @ 35° Rise Dimensions 20 1/2 H x 13 3/4 W X 5 1/4 D 25 3/4 H x 14 7/8 W x 11 1/8 D 25 3/48 H x 14 7/8 W x 11 1/8 D Weight 36 lbs 55 lbs 55 lbs Electrical Supply 120 V, 60 Hz, 2 Amps 120 V, 60 Hz, 2 Amps 120 V, 60 Hz, 2 Amps Exhaust Venting Horizontal or Vertical Horizontal or Vertical Horizontal or Vertical Warranty 10 Year Limited Warranty on Heat Exchanger; 3 Years Limited on Parts 10 Year Limited Warranty on Heat Exchanger; 3 Years Limited on Parts 10 Year Limited Warranty on Heat Exchanger; 3 Years Limited on Parts Comments Ideal for Southern States Heavy Duty Durable Unit Best Selling Commercial Heater Special Price $635.55  Starting at $787.55  Starting at $949.05

Below we have provided a listing of our most popular whole house electric tankless water heaters we sell. Electric tankless water heaters may be a good option for you if you are not able to vent a gas model, if you don't have gas running into your home.