HVAC tech showcases 'phenomenal' water heater with nearly 400% efficiency

HVAC tech showcases 'phenomenal' water heater with nearly 400% efficiency

There's a new type of ultra-efficient water heater taking over U.S. homes while reducing expensive utility bills.  As HVAC installer Bruce Dike explained in a conversation with This Old House, heat pump water heaters function differently than conventional systems.  Unlike gas and electric resistance water heaters, which generate heat, heat pump water heaters work more like a refrigerator in reverse, pulling ambient heat from the air and transfer…