instant hot water

[michaelf]

My mom has one instant hot water system for 2 bathrooms it always worked good but now it only works for one tub no sink or anything else. Anyone have any ideas?

 

[tthornto]

Assuming you mean 1 instant heater supplying two adjacent/close together bathrooms.

Could be a bad mixing valve? I've heard that when they go bad they can allow the hot to flow back into the cold supply.

I'm an IT guy and not a plumber (but I did stay at the Holiday Inn Express) so I'm not sure about this and my advice is worth exactly what you paid me for it.

 

[James-W]

My mom has one instant hot water system for 2 bathrooms it always worked good but now it only works for one tub no sink or anything else. Anyone have any ideas?

Does she have an "on-demand" water heater or does she have a regular water heater with a circulating pump that runs all the time?

 

[michaelf]

on demand

 

[MattT]

Probably the flow sensor that turns heat on. Flowrate on the tub that still works is high enough to still activate it. Lower flows on the other faucets aren't.

 

[Diesel Dan]

Depending on age and condition of water the heating elements might need cleaning.
I do believe ours call for annual maintenance/cleaning. That is what the valves and fittings at the bottom are for.

 

[redmondjp]

Some of the units have a temperature adjustment on them - did it get bumped or moved?

 

[rlitman]

Just a heads up, it's not good form to duplicate your thread on multiple forums:

I see you also have this thread here:
https://www.garagejournal.com/forum/showthread.php?t=390933

They really should be combined.