Electric Tankless Water Heaters 99%
Tankless electric water heater heat the water as it passes through the water heater, when the water is  not being used no energy is used. Most electric tankless water heaters are about 99% efficient. The big advantage is you never run out of hot water.
The major disadvantage with tankless electric water heaters is they require massive amounts of electricity. A electric tankless water heater capable of handling a single bathroom house requires 78amps of power at 240 volts, most older homes do not have this amount of power available. |
Electric water heater efficiency is based on how much energy from the electricity is transferred to the water. A typical tank type electric water heater is about 93% efficient. By installing a tank unit with R-16 insulation you can improve the efficiency to 95% .
water using a compressor. Under ideal conditions this water heater will produce over twice as much hot water as a standard electric tank water heater. When the ambient air temperature is to cold or when the demand is great back up heating elements heat the water dropping the efficiency to about 85% .