With an energy factor (EF) of 2.45, Rheem’s Prestige Series hybrid electric heat-pump water heater is the most efficient the company has offered to date. A backlit touchscreen control displays service alerts and diagnostic information for contractors, while dry fire protection shuts the unit down if it’s not full of water. Cost: around $1,200. Rheem, 800.621.5622, rheem.com

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