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Column | How to tap your water heater to warm your whole home

The Washington Post · last updated

Three years ago, Ted Treadwell turned his water heater into a battery.

His home in Santa Rosa, California, had relied on a gas-powered furnace and water heater for a quarter century to stay warm. But as the equipment neared the end of its life, the retired software engineer wanted something new — and to sever his ties to the gas utility.