> Aren't they also inappropriate for showers, as in they can't heat the water fast enough for a hot shower? Yep. I have looked at some newly built homes in my

> Aren't they also inappropriate for showers, as in they can't heat the water fast enough for a hot shower? Yep. I have looked at some newly built homes in my area. All of those that have heat pumps have flow heaters installed for hot water. So you have a COP of 1 there.