Hello - I built my pool one year ago but did not stumble on to TFP until after the build had been completed and have learned a TON on here since then. I'm about to add a bypass around my heater (should have asked the builder to add this initially I'm reading) and have read several of the TFP threads here about the plumbing layout, but would like input on the placement of the check valve in my system. I have an easy place to tee into my plumbing, but it would require me adding a second check valve upstream of my existing one (see photo and diagrams - my piping is extremely tight) to protect the heater. I'm concerned this will create a head issue but wanted some TFP input before cutting into the piping and choosing a solution. Thanks for any input you can provide!