I am trying to work out the general principle, here. They say a modern gas fired power station is 60% efficient. Does that mean 1kWh of gas produces 0.6kWh of electricity? And then, with a COP of 3, the heat pump would turn that 0.6kWh of electricity into 1.8kWh of heat. Whereas a modern gas boiler might be 85% efficient, so 1kWh of gas produces 0.85kWh of useful heat. Is this roughly correct?