> Running a single heatpump waterheater is the equivalent of not driving your car, annually, according to TVA (in carbon footprint).

This seems a lot but for utilities which still have coal plants it seems accurate if the reduced demand allows them to close the coal plant down.

A typical car emits 4.6 tonnes CO2 per year. https://www.epa.gov/greenvehicles/greenhouse-gas-emissions-t...

Heat pump saves around 3,760 kWh per year. https://www.energystar.gov/products/heat_pump_water_heaters/...

Coal emits 1.02 tonne CO2/MWh = 3.8 tonnes CO2 per year savings from the heat pump. Natural gas emits 0.44 tonne CO2/MWh = 1.65 tonne CO2. https://www.eia.gov/todayinenergy/detail.php?id=48296

That's a pretty substantial saving which will kick in when the next administration reverses Trump's absurd orders to keep existing coal plants open.