Uniform Energy Factor refers to a water heater's efficiency when run under simulated heavy use conditions for a 24-hour period. Electric Tankless is part of the Water Heaters test program at ...

though – you’ll need a 240-volt connection and a 40-amp circuit breaker to power its 9,600-watt heating element. Rheem’s RTEX-18 electric tankless water heater delivers impressive ...

If you use hot water three times a day, you could be dumping 600 gallons down the drain every month. An under-sink water heater can prevent that. You can choose a tank or tankless model.