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One more thing I can't figure out: even if the previous setup had the ability to flush the recirc line, I never used it and yet the system recovered on its own after a few weeks each time it was disrupted but this time it's been 2 months. Would a missing check valve on the recirc be enough to...

Thanks, that makes a lot of sense. I'll see about getting that implemented.

The recirc return attaches to a tee with one end going to a hose bib and the other into the bottom of the tank. Are you suggesting I drain that without turning off the cold supply? And do it until I get some kind of air release/sputtering? I know ideally I'd want to block the connection to...

In this case, the return goes to the bottom of the tank where the hose bib for draining is attached. Turning on the water in the kitchen causes this return pipe to heat up immediately, so I don't think there's a danger of cold water flowing into the siphon loop. Could I use the hosebib as a...

I agree the science makes sense. My mystery is really "what changed?" Why did installing a new Water Heater stop the recirculation. Is it possible the old recirc return line had some kind of check valve on it that was needed to make things work? I know it had a ball valve that was usually...

I've lived in my current house for several years and the hot water has always arrived within seconds, no matter how far from the hot water tank, so I always figured the house must have a recirculation system. And even though I found the pipe into the bottom of the water heater that I'm assuming...