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PostPosted: Wed Jul 11, 2018 9:23 am 
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with my central heating boiler switched off & getting hot water via the cylinder immersion switched on only after a while the cylinder makes noises as if the water is boiling inside ! ? Is it possible it could this be the result of the immersion element or the thermostat fault on the side of the cylinder & how would I know which one?


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PostPosted: Wed Jul 11, 2018 10:58 am 
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1. The thermostat on the side of the cylinder is for the central heating boiler controls. If the boiler is off, it won't be that one.
2. The immersion heater thermostat is under the can shaped metal or plastic cap on the outside end of the immersion heater. Do NOT remove this cap unless you can isolate the electrics and test to ensure they are isolated. Mains voltages present.
3. Older immersion heaters had only a temperature control thermostat. This turns the immersion off once the set temperature has been reached, and turns it back on again once the temperature has dropped. If the thermostat fails in the closed (immersion on) position it is possible for the water to boil. Because it expands as it heats it should vent into the cold water storage cistern via the vent pipe. See if your stored cold water is warm, and check for (very) hot water coming from the vent pipe. (The vent is the inverted U shaped pipe over the cold cistern, which should not be touching the water but just above it.
4. If it is the thermostat, this can be replaced without removing the immersion heater. Disconnect it, pull it out of its socket, get a new one, install and re-connect. Again, mains voltages involved so isolate.
5. Modern immersion heaters have two thermostats. One is for temperature control , as above. The other will cut out if the temperature goes above a set limit (usually 85 or 90 degrees Celsius) and has to be reset manually.



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PostPosted: Wed Jul 11, 2018 11:18 am 
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How hot is your HW at the tap?



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PostPosted: Wed Jul 11, 2018 7:00 pm 
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jaeger wrote:
How hot is your HW at the tap?
andy48 wrote:
1. The thermostat on the side of the cylinder is for the central heating boiler controls. If the boiler is off, it won't be that one.
2. The immersion heater thermostat is under the can shaped metal or plastic cap on the outside end of the immersion heater. Do NOT remove this cap unless you can isolate the electrics and test to ensure they are isolated. Mains voltages present.
3. Older immersion heaters had only a temperature control thermostat. This turns the immersion off once the set temperature has been reached, and turns it back on again once the temperature has dropped. If the thermostat fails in the closed (immersion on) position it is possible for the water to boil. Because it expands as it heats it should vent into the cold water storage cistern via the vent pipe. See if your stored cold water is warm, and check for (very) hot water coming from the vent pipe. (The vent is the inverted U shaped pipe over the cold cistern, which should not be touching the water but just above it.
4. If it is the thermostat, this can be replaced without removing the immersion heater. Disconnect it, pull it out of its socket, get a new one, install and re-connect. Again, mains voltages involved so isolate.
5. Modern immersion heaters have two thermostats. One is for temperature control , as above. The other will cut out if the temperature goes above a set limit (usually 85 or 90 degrees Celsius) and has to be reset manually.


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PostPosted: Thu Jul 12, 2018 8:26 am 
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jaeger wrote:
How hot is your HW at the tap?

seems to be hot !But only just moved into this house & the noise started as soon as the 1st time I turned the hot water on so it seems as if I've inherited this problem without being warned ??


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PostPosted: Thu Jul 12, 2018 9:42 am 
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IMO, If it's not unbelievably/scalding/dangerously hot then I'd say it's working OK, I've heard cylinders
make a gurgling/sizzling noise, a bit like a kettle in the first minute of turning on.
I've heard said that it settles down once some scale builds up on the element, whether
that's urban myth I don't know.
Must depend too on what insulation the tank has (Sound proofing)
If there is a thermostat under the connection cover of the element it may have
it's temperature rating on, you could measure the temp of the water just to satisfy
yourself it's in spec.


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PostPosted: Thu Jul 12, 2018 5:11 pm 
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If the hot tap isn't spluttering and steaming hot then the water won't be boiling in the cylinder, however still worth checking what temp. the thermostat on the immersion is set to.

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