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Building Science
Introducing the 120-volt Plug-in Heat Pump Water Heater

The good news is the model can save thousands of dollars. The downside is limited backup heat, which could mean running out of hot water.
Building Science
Hot Water System Retrofit

A DIY engineered hot water system uses a hybrid water heater in heat pump–only mode with a high-efficiency boiler and indirect heater

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Introducing the 120-volt Plug-in Heat Pump Water Heater