We have an over-the-bath shower with its own Bosch Powerstar AE125
water heater. Recently it has stopped producing hot water through the
bath tap, although there is still hot water if we switch it to shower
only. When we checked the heater, one of the three units in it is not
working . . . at least, it throws the breaker every time. The other
two seem to work just fine.
Any suggestions? Thanks!
Whether the tap is a potential suspect depends on what kind of tap the
bath tub has. If it's seperate valves for the hot and cold, then no
it sure isn't the tap. If it's some kind of combined valve,
tempering, etc, then yes it's possible it's the valve. But, per
Ed's comments, clearly you have a problem with the water heater, since
it's kicking out the breaker. I would start there. Also, you can
verify if water from the water heater is coming into the tub by simply
shutting off the valve on the water heater when the bath is on hot and
The only thing I can think of that might explain what you are seeing
is this. The heater has multiple elements. It uses only some of
them for low demand, eg the shower. When it goes to use all of them
for the tub and finds something unusual, eg the breaker is tripped and
no power to one element, maybe it shuts down completely.
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