We are having a complete pool remodel with the addition of a pool/spa heater. The original setup had the newer large pump/filter on left operating pool suction and return, as well as a fountain return only. The older pump on right operated the suction and return of the fountain. However, because the pool pump also had a return to fountain, we shut the return from the spa pump to the fountain off, so that the spa feature would just circulate by itself and the return from the pool pump to fountain would create the overflow back to the pool. The only issue was there was no suction going on with the fountain unless we ran it thru the spa. They just hooked up this heater and so far a little confused. We wanted to be able to heat the spa or pool separately or both at the same time. They added a bunch of valves, etc . So I will describe what we have. On the far left by the pool pump filter you have the backwash pipe and at that corner is a pipe leading down into the ground which is the pool return. To the right you see pool suction valves. To the right of that you see spa and fountain suction valves and on the far right is the spa fountain return. I can visualize how they are getting the water into the heater from all points, but the only return from the heater is going back to the fountain return. Are they trying to heat the fountain first, then spillover into the pool, then get sucked up thru the spa? What’s up with this? Note there is no spa spillover just the waterfall spillover so to speak.