Heat Pump - circulate water through it when off for winter?

GilesM

Member
Feb 19, 2024
17
Oregon
Pool Size
22000
Surface
Plaster
We have an Arctic heat pump for our indoor pool. It did a great job keeping the pool warm all summer. This is our first full winter here and I'm not sure we will want to keep the pool heated as we don't plan to heat the pool room (too large) and resulting evaporation could be an issue as could humidity management. We'll see.

When the heat pump is off (as in turned off for winter, not just off between heating cycles), I have option to manually close the bypass inlet valve (and outlet check valve) that circulates water through the heat pump. In this mode, the pool circulation pump would still send water through the 2" piping exterior to the pool utility room in a loop to the heat pump. Note: our area can experience a few days of sub-freezing temps each winter. If I open the valve it will also circulate water through the heat pump plumbing. Is that desired in order to keep the water in the HP loops from freezing or "going stale"? Or not?

On a related note, I run the pool pump at low speed all summer because the HP is on. During winter, I suppose I have the option to continue that or to cut back to 8 hours per day at the same low speed. I'm thinking it is best to leave it on 24/7. Yes?
 
If you are not winterizing your heat pump, and the heater is outdoors where it may freeze, then yes, you need to keep water circulating through it. 24x7 is my suggestion.
 
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