It was originally an experiment and If it was my sole source of heat it would be marginal at best. However it actually works out well in conjunction with my oil furnace. I’m burning a fraction of the oil I used to. The filtration system is drained in the winter so no freezing issues there. I use removable supply and return headers that outflow and draw off the bottom of the pool below the freeze line, one at each end of the pool. The lines to and from the house are buried for freeze protection. I do have freeze up issues with the short above ground parts though. Haven't solved this issue without having to resort to heat tracing which isnt very efficient.

Right now i remove the supply and return headers in the summer so i can use the pool. I wish i could figure out a way of making it permanent and hidden so i could cool with it in the summer but being an experiment, i wanted to keep everything temporary until i can verify that was a viable solution.