[–] kurthr 7y ago ↗ It's worth noting that a heat pump (like the hot end of an air-conditioner) can have nominal efficiency in excess of 100%. According to the DoE heat pump based water heaters can be 2-3x as efficient as a standard gas water heater.https://www.energy.gov/energysaver/water-heating/heat-pump-w...
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[ 3.0 ms ] story [ 10.3 ms ] threadhttps://www.energy.gov/energysaver/water-heating/heat-pump-w...