Make a diy solar pool heater using inexpensive material in a weekend. Using 2×4 joined in an x with half lap joints. How To Make An Easy Diy Solar Pool Heater - Anikas Diy Life This is called a closed loop, pv pumped solar hot water system. Diy solar pool heater pump size . The existing pool pump is used for circulation of the water through the panels. The operating pressure of the pump was 1.0 bar (10m) during normal recirculation through the sand filter. Here are the factors to look at when sizing a solar pool heater: Measure the temperature increase from your test collector This is part 3 of the video series and includes adding a thermometer and lexa. A pump with a power rating of 0.75kw for panels installed on a single simplex roof and and a 1.1kw pump for double storey roofs are required to ensure sufficient water circulation. In general though, for average sized pools and solar pool heating systems a 0.5 to 1hp pump is sufficient, unless you have a large num...