Electrical models are much easier to install than their gas counterparts. The most important piece of information you need to know before purchasing your electric tankless water heater is the amount and type of electricity you have available. Please use the factors below to help you ensure you have enough electricity to run a tankless water heater.
Average household Statistics (1985 or newer)
Most modern homes have a total of 150-200 amps
All appliances added up use 100-150 amps on average
50% or more of electric tankless water heaters will use 100+ amps while running
50% or more of electric tankless water heater installations will require some update or upgrade of existing electrical work
Some household water heaters run on 120 Volts, all of the tankless water heaters below run on 208-240 Volts
Use the chart below to determine if your chosen tankless water heater will work with your electrical situation.
Model
GPM@ 45 degree temp rise*
Breaker Size
Min. Recommended Total House Amperage
Electrical Remainder (200 amp house)
Tempra 36
5.5 GPM
3 x 60 amps
300 amps
N/A
Tempra 29
4.5 GPM
3 x 50 amps
250 amps
N/A
AE125
4.0 GPM
3 x 40 amps
200 amps
80 amps
Tempra 24
3.7 GPM
2 x 60 amps
200 amps
80 amps
Tempra 20
2.8 GPM
2 x 50 amps
180 amps
100 amps
AE115
2.6 GPM
2 x 40 amps
180 amps
120 amps
Tempra 15
2.25 GPM
2 x 40 amps
150 amps
120 amps
AE12
2.0 GPM
1 x 50 amps
120 amps
150 amps
Tempra 12
1.75 GPM
1 x 60 amps
150 amps
140 amps
*Remember the more gallons per minute of hot water you require the higher your electrical requirements will be.
Listing from left to right is shown the following:
Tankless water heater model # - Model of the specific water heater
Water flow - Gallons per minute (GPM) raising the incoming water temp. by 45 º. For example your cold water comes in at 60º you will have 105º hot water coming out of your faucet.
Breaker size –the amount of amps required when wiring the unit to avoid overloading the circuit.
Min. Recommended House Amperage – the minimum amount of amps for the entire house that is recommended for best results
Electrical Remainder (200 amp house) –simply the amount of electricity leftover for your other electric drawing applications to use in a standard 200 amp house. The average home needs 100-150 amps for their other appliances. If it looks like you may go over 200 amps for your home, we recommend contacting your electric company or electrician to inquire about an upgrade.
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