We recently had a new thermostat fitted to our immersion tank. The water is
now that hot that it melts the plug when I run a bath.
Also I went to run one tonight and the water is absolutely filthy, a mucky
Can anyone help with what the cause of this may be?
First things first,,if you isolate the power supply (best to do this
at the "fusebox" to be sure),whip the cover off the immersion heater
and you should find a thermostat adjustment,just tweak it down a bit
and see how it goes .
do you have gas central heating by any chance? if so you might have
a"primatic" brand cylinder with a displaced airlock or defect.
If not,it may just be that the immersion is running that hot that it
is stirring up turbulence and muck in the bottom of the cylinder..
Sounds like a duff part or the plumber #-up puttingit in. Tell him to
replace it. It is a coincidence the dirt all came at the same time.
Probably cleaned the shit off the sides of the system. In the meantime
switch the system on only a few minutes at a time. It shouldn't need
that much time to warm a bath. A thermostat has very limited adjustment
range I believe. It certainly shouldn't be boiling the water.
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Can you clarify a little, perhaps?
How is your hot water heated? Just immersion heater (in which case was it
the thermostat or the immersion heater that was replaced) or via a central
What was the thermostat you have had replaced connected to? What heat source
did it control?
If it is via a boiler, what kind of bolier? Gas, solid fuel? Traditional or
Is the water heated by a pumped supply, or by direct convection (gravity)?
Brown water is normally a sign that the water has been boiled, and thus
stirred up all the rust and other detritus in the system.
Several things should stop this happening:
(1) The thermostat on the hot water tank should turn off the boiler and/or
close a valve once the water is up to temperature - assuming you have a
(2) The thermostat on the boiler should limit the temperature of the water
flowing through the circuit - it should never be close to boiling because
you could scald yourself from hot taps and radiators.
(3) If you are using an immersion heater the thermostat on the immersion
heater should prevent the water from boiling.
Assuming you have the above mechanisms to prevent the water overheating,
they should be checked and replaced if defective.
One obvious fix is to turn down the boiler thermostat (if you have one). The
water in the tank and radiators cannot get over hot if the boiler thermostat
is set low.
We used to have this problem, but this was because we used an old solid fuel
Raeburn cooker with a back boiler and a gravity fed circuit to heat our hot
water. Every now and then we would forget to close down the draught
overnight and the water would boil at about 02:00. The result was rust
coloured water for a bit. Thermostat? Don't have new fangled devices like
Presumably a faulty or incorrectly wired thermostat, or the new one's
set too high (there should be a 'block' attached to the tank, with a
flex attached; on the block will be a little dial which you adjust
with a screwdriver). Should be set to 60-70; if it already is,
More info needed. Hot tap, cold tap, or both? All taps in the
properety, or just the bath? Do you have a cold water storage tank
(eg in your attic)? Or is the bath tap fed direct from the mains?Does
the colour eventually go away if you run the tap long enough, and then
reappear next time you run it?
Hot tap now since the new element, cold tap in summertime which I am told is
I haven't noticed any colour downstairs, so mainly upstairs.
No cold water tank nothing in the loft just one box in the bedroom cupboard
for the hot water. Yes it eventually goes but by that time the hot water has
been drained off and I have to reheat the water, if you know what I mean.
Our tank doesn't hold a great deal of water.
Sorry for the lack of info.
I'll do my best to clarify, the mucky water sometimes comes from the cold
tap (this is normal for summer apparently? so the neighbours tell me)( I am
in Somerset) but lately just from the hot tap. We have an emersion heater
and that is heated by switching it on from downstairs. We have no GAS
central heating but have radiators heated by our coal fire, which also heats
the water when the fire is lit.
When he came to replace the thermostat he said the wrong one had been fitted
before, because our tank isn't very big depth wise they had got the wrong
element and folded it over itself, in effect doubling it up so it fitted in
and didn't touch the rear of the tank. He apparently fitted the right one
but said our tank is a sealed unit and if the heater was removed again it
would probably split the tank as there was a thin layer if skin and if it
splits a new tank is required.
We get bits in the water not just dirty but looks like some kind of
Thanks for the help, novice this end so sorry if the message seems a little
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