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instant hot water
- Thread starter michaelf
- Start date
Northislander
Well-known member
I'm a bit at a loss from your description does she have an on demand or a recirculation pump?
We used to have that problem periodically with our system.
There is an inline "paddle wheel" that spins and tells the "brain" how much water is flowing, thereby letting it know how much/how fast to heat the water.
We have hard water, which gummed up the paddle wheel a bit and caused it to not work unless a LOT of flow was going past it (typically if we were out of town/not using water for a few days this would happen).
Took it off and blew it to hyper-speed with compressed air to fix it, then learned I could just tap on it without taking it apart. Hasn't happened in a long time now.
There is an inline "paddle wheel" that spins and tells the "brain" how much water is flowing, thereby letting it know how much/how fast to heat the water.
We have hard water, which gummed up the paddle wheel a bit and caused it to not work unless a LOT of flow was going past it (typically if we were out of town/not using water for a few days this would happen).
Took it off and blew it to hyper-speed with compressed air to fix it, then learned I could just tap on it without taking it apart. Hasn't happened in a long time now.
rlitman
Well-known member
Right. On demand water heaters have a flow sensor. Yours is getting stuck.
ard
Well-known member
Turn both sinks on simultaneously, if that triggers the hot water, it's the flow sensor.....
mygarageone
Well-known member
Right. On demand water heaters have a flow sensor. Yours is getting stuck.
They also have a small screen filter on the inlet side , may be clogged . Has it been properly flush lately , the tub flows the most water and forces the unit to fire, that tells me you have a flow problem.