Hey all, I have a question about waterflow through the heater. I have a 18k gal pool, full pentair system with TritonII sand filter. The output of the VS pump goes into the sand filter, then out of the sand filter into a 3 way valve. One output of the 3 way goes to the gas heater, the other outlet goes directly to the pool return. The outlet of the heater is plumbed also to the same pool return as the 3 way valve outlet using a T fitting. This is nice I guess since I can isolate the heater or future solar completely from the system. However, my pool builder said I should set the valve so that the heater loop and direct return are both open. This doesn't make any sense to me as I don't think in this configuration there is going to be any pressure differential to push water through the heater at all. It should be all or nothing (or am I mistaken). Maybe it's set up like this because I am pre-plumbed for solar???
Thanks guys and gals!