The best gas heat pumps I’ve seen have about 1.8 ratio. Better than a gas boiler, similar to a mid range electric one driven by a gas power plant, but way less

The best gas heat pumps I’ve seen have about 1.8 ratio. Better than a gas boiler, similar to a mid range electric one driven by a gas power plant, but way less than one driven by a grid with a decent amount of renewable (in terms of heat produced per unit of co2) On the assumption that grids are reducing their co2 load then an electric heat pump will continue to get more efficient while a gas one won’t.