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Sorry for the late reply. I was away on business travel. The manifolds you see in the photo supply heated water to the six fan coils in various places throughout the house. I know that the faucets are also plumbed with PEX-AL-PEX, but I don't know where in the house the manifold is for that...

Interesting...do you suppose that's intentional? I mean, if the mixing valve is allowing the hot water to backflow, then indeed there is a path to the expansion tank -- so long as the ball valve near tee #1 is open. That waterflex stuff constitutes most of the piping in the system, as you can...

Wanted to follow-up. The installation company decided to do a full warranty replacement. New tank and no charge for equipment or labor. They agreed that the earlier suggestion of condensation was incorrect. I had never really researched how this system works before, and have learned a lot about...

OK. I know I shouldn't have done this, especially since I myself am a forum admin, but I simplified my earlier diagram to try to keep the post from getting too long or complicated. Because this curious check valve has aroused suspicion, it seems important to provide more detail. Here's a...

Hi, Terry. I figured you'd recognize the installer. When the original water heater fell apart in 2008 (after six years of service), it was on the Sunday morning before I was scheduled to depart for a three-week international trip. Understandably, my family wanted it fixed now, and the installer...

I am unsure of whether my symptoms reveal two problems or if they're related. Anyway... Friday morning, my wife complained of no hot water for the shower. When I went to investigate the water heater, I noticed a small puddle surrounding it, a circle approximately two inches wider than the base...