We have a set of EnerSol solar panels (black water pipes) which are installed on the roof. Our pool pump sends water up to the panels via black PVC pipes. The water goes through the panels, warms significantly then returns back down to the pool.
When it's running it works great. The water feels warm coming out of the jets and the pool is nice and warm all summer.
The problem is... we are up in Southern Canada and the winters are harsh on the panels. Every spring we have burst PVC pipes in various places which necessitate an expensive call to a plumber. This despite carefully blowing out all the water from the pipes in the fall. (I suspect some water doesn't fully drain due to being at the bottom of the roof slope.)
Are black PVC pipes appropriate in this situation? Anyone have a similar setup with any advice?