this post was submitted on 22 Nov 2023
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I've been considering replacing the central a/c in my house with a heat pump to handle home heating as well, but never thought about heating water that way also. That's interesting. Can you get a single heat pump system that does both?
Where water heating is concerned, I do know a guy who set up a solar water heater, and he made some compelling arguments for it. Like he considered rooftop solar panels initially to generate electricity, but opted for water heating instead. He pointed out that while electric panels are maybe 20% efficient, water heating is nearly 100% efficient, and his system works so well that it even needs to shut off every now and then to prevent overheating. Anyway, I'm not vouching for this personally since I have no experience with it, but I'm just throwing it out there another possible approach?
Can confirm the solar water heating works great, if it's sunny you get 60°c water by noon.
My concern is legionella. If you don't get enough sun and the water temperature stay at ~45°C for extended amount of time, isn't the water tank became an ideal breeding ground for legionella?
Powered solar heat pumps sanitize themselves once a week if temperature doesn't reach 70C at least once. Same for heat pump boilers, they are usually set to 50C but goes up to 70C weekly.
On solar, there is always a downstream heater that can heat cold water to 60C+ and must be set at least that high for legionella. My setup is like that, unpowered solar tank for free heat if available, and gas boosts it up to safe temperature and does all the work in the winter.