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Gas vs. Electric  

Tankless Water Heater

Appliance What is the GPM usage?

Bathroom Faucet 1.0 
Bath Tub 4.0 to 5.0
Shower 2.5 
Multi Shower Heads 2.5 to 12 
Kitchen Sink 1.5 
Dishwasher 1.5 
Washing Machine 2.0

 Water Usage:

Do you need to run 2 showers at the same time or maybe a shower and a couple sinks?  You may install a demand water heater centrally or at the point of use, depending on the amount of hot water required. For example, you can use a small electric unit as a booster for a remote bathroom or laundry. These are usually installed in a closet or underneath a sink.

List the number of hot water devices you expect to have open at any one time, and add up their flow rates. This is the desired flow rate for the demand water heater. 

Electric vs. Gas Efficiency:

Keep in mind that this difference is the reason that tank heaters run out of water quicker from colder incoming water in the winter than the rest of the year. With the tankless you won’t run out but you may be limited to how many hot water uses you may perform at the same time.

A tankless gas  water heater having an efficiency rating (EF) of 82% would have to be rated at least for 116,000 Btu per hour and an electric at 95,500 Btu’s per hour or 28kW. This difference in Btu rating may be confusing but gas is rated at the heat output of the burner, whereas; the electric, for the heat that is going directly into the water. 

REMEMBER, the energy (and cost) required for a family of two to heat the water they actually use is less than the energy wasted by a 40-gallon gas tank storage heater in just reheating the same water. This is energy expended before the first drop of hot water is used.

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