Your last paragraph is spot-on! That's why it's so tragic that the economics are so unfavorable for air-to-water heat pumps in the US right now. I have a new co

Your last paragraph is spot-on! That's why it's so tragic that the economics are so unfavorable for air-to-water heat pumps in the US right now. I have a new combi boiler on the wall now (which was eligible for a rebate from my local utility company!). Hopefully when it comes time to replace it (in about 2042), the economics will have shifted to make an A2W competitive as its replacement.