why does my central heating expansion tank fill up with hot water
Corazon de Melon
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Monday, 9th of August 2010 02:06:49 PM
l had the boiler turned up fairly high, but only one rad out of 12 set to Corazon de Melon come on. Is this the reason. when l noticed the overflow pipe discharging Registered User hot water l realised what was going on. are expansion tanks meant to Joined: Monday, 26th of April 2010, 05:03:15 'collect' the hot water from radiators?
Posts: 1112 Viewed 17933 times
The Bubbas
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Tuesday, 10th of August 2010 09:26:57 AM
only partial here I am afraid, it wont be a split diaphragm in The Bubbas an expansion vessel you don't have one you don't need to pressurise ur Registered User system it is open vented not sealed, you may indeed have a blocked cold Joined: Wednesday, 16th of June 2010, 19:33:39 feed easiest way to check go into ur loft lift the lid on the expansion Posts: 667 tank & check the open vent pipe hanging into it. Viewed 17070 times no water should come out when the system is running - ever.
your pump probably wont need to be adjusted reason being if ur system has
worked properly for many years with it at the same setting & no one has
altered it. it must be a fault elsewhere.
angelfish
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Wednesday, 11th of August 2010 03:00:45 PM
Because you have the boiler turned up high and only one rad, angelfish the pump for the heating circuit is pumping the water up the expansion Registered User pipe into the expansion tank. Your pump was designed to pump for 12 rads Joined: Tuesday, 11th of May 2010, 00:26:36 not one. You must be careful if your expansion tank is a plastic type Posts: 74 because the prolonged discharge of boiling water into it, can soften the Viewed 12692 times plastic, and you may have very hot water coming through the ceiling. I
have seen this happen.
Amor
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Thursday, 12th of August 2010 09:18:48 PM
Jim m is right Amor Open up more rads Registered User Fill and exspansion only Joined: Thursday, 17th of June 2010, 11:25:05 there should b no circulation via f/e Posts: 1020 turn b stat down Viewed 3732 times
Boinski
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Friday, 13th of August 2010 11:17:19 AM
Not wanting to miss diagnose, you need to call a professional, Boinski it needs to be looked into. Registered User Joined: Monday, 21st of June 2010, 23:00:17 Posts: 805 Viewed 8529 times
giggle kitten
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Saturday, 14th of August 2010 08:12:57 AM
it sounds like you have an old heating system,,, turn the speed giggle kitten of you pump down,, the speed selecter is on your pump, your pump was Registered User pumping the heating water over, turn your boiler stat down as well,,, also Joined: Monday, 14th of June 2010, 08:55:40 try venting your rads,, if youre not getting any water out of the rads Posts: 797 upstairs,, you have a blocked cold feed. Viewed 10411 times if you have a section of pipework should be cut out and replaced, (where
the cold feed tees into the open vent)
a power flush would be a good idea as well.
Relishh=)
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Sunday, 15th of August 2010 12:36:21 AM
water shouldn't collect in the expansion tank nor discharge Relishh=) from the blowoff pipe under normal use. Registered User i think your expansion tanks diafram is split and the pressure is now Joined: Friday, 28th of May 2010, 18:42:29 getting so high it is blowing off. Posts: 356 normal running should be at 1 and half bar. Viewed 13246 times i think you should seek the advice of a plumber it could be somthing else
but that sounds more likely
haboulz
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Monday, 16th of August 2010 01:04:58 AM
your boiler stat is up to high haboulz Registered User Joined: Thursday, 29th of April 2010, 09:05:45 Posts: 701 Viewed 12564 times
MY SEXY NERD
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Tuesday, 17th of August 2010 07:12:58 PM
If the expansion tank had too much water in it when it was cool MY SEXY NERD then as the system heated the volume expands & excess water will overflow Registered User if the thermal expansion is larger than the ullage voume. If after cooling Joined: Wednesday, 26th of May 2010, 15:13:05 & putting back on it overflows again it would suggest that the float valve Posts: 1681 is leaking water into the system all the time, if this was the case then Viewed 18512 times it will eventually overflow all the time. Alternatively the expansion tank
is too small & cannot cope with the thermal expansion within ur system .
Does it overflow when cold? Hvae you tried going from hot to cold & back
to hot & is it still overflowing?
Babe Cakes
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Wednesday, 18th of August 2010 05:36:51 AM
No, I think when that happens it has to be replaced. Babe Cakes Registered User http://homerepair.about.com/od/heatingcoolingrepair/ss/trblsht_boiler_5.htm Joined: Friday, 14th of May 2010, 18:59:18 Posts: 1831 Viewed 13322 times
AngelStar
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Thursday, 19th of August 2010 07:09:35 AM
it all depends where the plumber directed the over flow, but AngelStar yes. You would not want this water flow into your cold water tank. It have Registered User anti corrosion chemicals in so is best placed back in the system. Joined: Saturday, 1st of May 2010, 06:44:34 Posts: 1981 Viewed 10295 times
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