I currently have an 8x20 solar panel heating that I put in last summer. It does a good job, when we have sun. This year I purchased a gas heater and want to add it in. I put the solar in using 3/4" black tube, moreso as a trial. This year I'll be replumbing it with 1.5" PVC.
The manual states that I should not feed from solar into the gas heater. My guess is the water coming out of the panel may be warm and then the gas heater won't trigger.
So my plan is to plumb it such that I use one or the other.
This is what I was thinking:
Just want to make sure I'm not doing anything silly.