This solar pool heating mat is an environmentally friendly product using free heat from the sun. It works by absorbing heat from the sun’s rays into the heavy duty black matt material. Water is circulated through the pipes within the mat which is warmed up and in turn gives you and your kids a lovely warm pool which is not cost the earth and is certainly much cheaper than any other form of water heating. During testing, over 2 days we have used this product to increase a pool temperature from around 20 deg C to almost 36 deg C which is certainly very comfortable. We have chosen a tough NBR rubber material for our solar absorption mats which will have a long life and is UPVC degradation resistant. In our recent testing of similar products we found that the cheaper PVC solar absorption mats are very easily punctured but their biggest problem is that the PVC material warps in the heat of the sun which restricts water flow. Guidance Calculation Example (Children’s Play Pools) : Circular