Keeping the filter and heater from freezing was one of my husband’s greatest concerns about having my outdoor swimming pool functional during the winter. Last winter, we managed to avoid disaster due to his insulated equipment housing and running the heater a fair amount. He monitored the temperature of the enclosure with my greenhouse indoor/outdoor thermometer, which records highs and lows for the day. This way he had a record of how cold it was getting next to the pool versus inside the thick foam lean-to. With some days in January getting below zero Fahrenheit, this was watched closely.
All the while, he was finding snippets of time (between business travel and major surgery) to construct a system of pipes encased in cement to warm things more uniformly and reliably this winter. It is finally all in place and here are a series of photos to show what he made, followed by a video of his explanation at the end. Click on any photo to enlarge.
Then, the same type of plastic pipe was used to connect the exposed ends of pipe in the upper slab to the exposed ends of pipe in the lower slab. He explains how it should work in the video below.
If you want to know more about how he made the pipes themselves, let me know. I have ways of extracting the information that I want. 😉