One last (I hope) question about my E50c. The install manual shows the air scoop and expansion tank on the return side, close to the low loss header. A Rinnai system piping manual for the same E50C has the air scoop where I've slways seen them, on the supply side right before the circ pump, but with the expansion tank on the return side. I've asked Rinnai tech support if there's a specific reason why either of their illustrations show it set up like that, if I should do one or the other, and why they're different from each other. So far no answer; it got escalated up the chain to the engineers, but no word back yet. Any thoughts? Without their illustrations I would have mounted the tank below the air scoop on the supply side right before the pump.
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