I installed an on demand hot water heater 9 months ago Rheem brand. Over the past 2 weeks when I have tried to run bath water I could only get a few seconds of hot water. I unplugged it the first time and it seemed to heat the water again but last night it did the same thing. I wasn't able to get anymore than a few seconds of hot water. I have only had this issue with running a bath, not a shower. Does anyone have any ideas?
Somewhere inside there is a water pressure or flow sensor that turns the heater on. Check that to see how well it is working. Clogging with sediment is not unusual.
The average homeowner who lost his house in the Oklahoma tornadoes should move for good and not rebuild. Too much complexity watchdogging the contractor. Too much a chance to be defrauded.