This startup wants to turn your water heater into a smart thermal battery

Reservoir’s ultra-efficient water heater can save you money by running when electricity is cheap—and help the grid make better use of renewable energy.

[Source Image: Reservoir]

Unless your shower turns cold, you probably don’t give much thought to your water heater. But it’s a major energy user in the home, and unlike solar panels or heat pumps, it’s gotten relatively little attention as a piece of smart home tech. A new startup is trying to change that.

The company, called Reservoir, designed a heat pump water heater that predicts when you’ll need hot water and heats up in advance, when electricity........

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