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1537 posts

Uber Geek

# 177390 31-Jul-2015 19:37
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Our approximately 6 month old hot water cylinder has started boiling more often than it should. i.e. it will boil and then stop and then five minutes later, boil again.
As it is under warranty, we rang the place of purchase who then contacted a plumber. The plumber then rang my partner and he told her that it could be leak, but I am suspecting a thermostat problem.

If there is anyone here clued up on HW cylinders, why would the cylinder be boiling often, especially when there is no filling of it going on, as you can tell the difference in filling and boiling.

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2122 posts

Uber Geek

  # 1356298 31-Jul-2015 19:42
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Turn off the valve to the cylinder. If it is a leak, the constant cycling will stop/reduce.

If you have a water meter, you could check it before and after a period of guaranteed no water use.

Location: Dunedin


1537 posts

Uber Geek

  # 1356310 31-Jul-2015 20:01
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andrewNZ: Turn off the valve to the cylinder. If it is a leak, the constant cycling will stop/reduce.

If you have a water meter, you could check it before and after a period of guaranteed no water use.

I'm guessing you mean a valve in the roof, on the header tank? It's a low pressure cylinder by the way. 
Also, not long after it was installed, the cylinder blew the fuse for it, so a sparky put in a slightly heavier fuse wire. It hasn't blown since, so that is another reason, I suspect something is going on with the thermostat.



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Uber Geek

  # 1356324 31-Jul-2015 20:31
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don't leave the water turned off and forget about it. That could seriously void the warranty.

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Uber Geek

  # 1356339 31-Jul-2015 20:50
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if it is a rewirable fuse, then the sparky should have been able to tell how the fuse blew, i.e. overload or short circuit. If he just increased the size, I'd suspect it was nothing to worry about.

I guess the valve in the roof is the one, the one that feeds cold water to the cylinder. As gzt says, don't just turn it off and walk away.
You should be able to get an idea very quickly if it is a leak or not, the constant regular heating will stop very quickly (within 10 mins) when the water is turned off.
Turning the water back on would cause it to start cycling again.

Location: Dunedin



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Uber Geek

  # 1356353 31-Jul-2015 21:21
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Imho wait for the plumber. If it is a warranty issue then it will be fixed, if it is some other fault you will need a plumber anyway. Personally if it was boiling every five minutes I would turn it off until I planned on using hot water. Until the plumber arrives.

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