I can’t speak for every situation, but basically: yes. It’s not the heat pump itself that’s the limit, it’s the energy source that feeds it. The skinny gas pipe

I can’t speak for every situation, but basically: yes. It’s not the heat pump itself that’s the limit, it’s the energy source that feeds it. The skinny gas pipe going into my home can deliver vastly more energy than the crappy old wires and breaker box can. Upgrading the breaker box is certainly not impossible, but it is enormously expensive. The expense is mostly the expert labor required. If we really cared about making this transition, we would set up collective action and utilize economies of scale by having the utility company come through a neighborhood and upgrade service to every house at the same time to massively reduce the labor costs per home, and amortize the cost of the work. I don’t expect to see that happen in my lifetime, however.