3 ms·
That usually is true if your electricity is generated by natural gas too and you're comparing it against a gas HWH Rough math is NG -> Electricty is 50% effic
by xxpor 4y ago
That usually is true if your electricity is generated by natural gas too and you're comparing it against a gas HWH
Rough math is
NG -> Electricty is 50% efficient thermally.
A heat pump can have a COP of 4.2.
100 * .5 * 4.2 = 210% efficient, thermally
A hot water heater powered directly by gas is ~100% efficient thermally.
- kkfx 4y agoPersonally I do not care about efficiency: I can't sell energy I produce so the point is just heating the water and the load profile of a classic resistance and the load needs of my houses match normally to heat without the heat-pump (witch have a far limited life respect of a classic resistence)... I use the heat pump mode only when there is little solar for few days where there is not enough overall energy production, otherwise being able to produce 120-130% of the overall consumption (of course ONLY when the Sun shine, so NOT independent as some sell just playing with absolute numbers) why care about efficiency? I can't use the extra energy anyway...