Among heat pump water heaters, Stiebel Eltron’s Accelera 300 has the largest capacity (80 gal), highest energy factor (2.51), lowest power input (2.2 kW), and lowest power consumption (1739 kWh/year) as determined by DOE testing. Low-power consumption (500 W heat pump only, and 2200 W with backup element) makes the Accelera 300 a viable option for connecting to a PV system. Accelera 300 is Energy Star-certified, and is eligible for available state or local tax credits, or rebate incentives. There is also a 10-year warranty.

 

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