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Rinnai

Most Efficient Water Heater Systems by Rinnai

SYSTEM TYPE TANK SIZE EFFICIENCY (UEF) SOLD AS (BRANDS & MODELS)  
Heat Pump 75 gal 4.0 Rinnai REHP80BM View System
Heat Pump 46 gal 3.75 Rinnai REHP50BM View System

Conventional Electric Ain't Efficient!

Guess what!? Conventional electric Water Heaters are not efficient enough for Energy Star to certify them, and these days, there's no reason not to get a heat pump water heater, so you won't find any here.