I have an above ground pool. Last year, I added a solar heater that had a built in diverter valve. This year, I want to mount the heater on a roof and wont be able to access the built in diverter. I have seen the "H" style diverters for sale. This may be an odd question, but if the valve is set to "open" (in other words, to bypass the heater), what is preventing water from continuing to try to go up to the heater? Or does the water take the path of least resistance and go back into the pool? I guess what I am asking is, will something like this achieve my goal of bypassing the heater when necessary? http://www.amazon.com/SunKeeper-Sun...&sr=8-26&keywords=solar+heater+diverter+valve