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No way to flush without cutting pipes. Expansion tank on the hot. Here's a photo of the bad install and the recent estimate

Here's a followup. I replaced the check valve and the flow sensor after flushing the water heater. It was working great. Then a couple of weeks ago - no hot water. I opened the cover of the water heater and water was sprayiing out near the top. I considederd that I was looking at a leak in the...

Thanks - I have ordered a check valve and will install it when it arrives.

Yes. I flushed it following the instructions in the owner's manual with a commercial descaler for about an hour. There didn't appear to be an abundance of debris produced. I plan to do it again next week and I will do it longer as you have suggested. I will also clean the intake and...

I used a commercial cleaner. I have not seen any evidence of leaks yet. I have not yet looked inside the unit for leaks. I will do so this week. Thanks

Thanks for the quick reply. 1. I will replace the check valve - looks pretty easy. 2. The installation manual does recommend 3/4" for the recirculation line, but goes on to say you could use up to 100' of 1/2" copper. I don't know how that would relate to the 50' of 1/2" PEX that I have, but it...

Our Navien NPE-240A Tankless Water Heater “surges” or “pulses” when demand is more than a couple of gpm. Yesterday we had both showers going simultaneously and they both started “pulsing” hot-no hot-hot-no hot at about 1 second intervals until one was shut off. We were able to repeat this...