Heat pump water heaters: Advice for choosing and installing a heater for a 3100 gallon semi-inground pool in New England?

gerzak

Member
Jul 3, 2023
11
Northwest Connecticut
Pool Size
3500
Surface
Vinyl
Chlorine
Liquid Chlorine
Hey all,
I realized that I need a heater for my small pool that I built last year, not just to extend the season, but even to get it up to a nice temperature during the height of the summer. The pool is 9 x 13 and 4 feet deep. The plumbing pipes and the pool walls are all moderately insulated, so once I get some heat into this thing, it should stick around for a bit. I’m happy to use one of those bubble wrap style covers, which I have already, but I don’t get enough sun exposure to let the pool heat up on its own, even on sunny summer days.

Based on my research so far, it seems like a 30,000 BTU heat pump pool heater should be plenty big. I run my variable speed pump 24 hours a day at a low speed, which keeps the pool super clean and doesn’t use much electricity, so that seems to be a good situation for running a heat pump heater as far as I can tell… but please set me straight if I’ve got that wrong.

I’ve had my eye on these heaters by Raypak:

I liked it they are affiliated with Rheem, who makes high-quality heat pump water heaters for houses, but I found them for really good price online in a few different places. But I’m happy to hear feedback on other brands if anyone has any luck with a particular make and model.

Any thoughts on water heater choices and sizing?
 

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not just to extend the season, but even to get it up to a nice temperature during the height of the summer.
Which one are you looking for ?

HPs excel at warming an already warm pool.

Gas heaters excel at extending the season.



In a perfect world, everyone would get both, but most have to choose and live with the decision. Even when oversized, HPs simply can't go as deep into the shoulder months as a gas heater.
 
Gas is just out of our budget, and we have solar electric, so we try to use electric appliances whenever possible. I’d even be willing to eventually add solar if that made sense. Plus, my pool has about R-20 insulation on the walls, so if I use a solar cover, I expect to be able to hold heat longer than a typical pool. I’m ok if the season isn’t super long as long as we can get the summer months to be comfortably warm.
 
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