The tap in the hot-press is permanently open and the pressure remains steady at 1 bar. I've had absolutely no problems except to bleed the system -
Our valve is in the hot press on one of the pipes leading into the water tank.
The reason it remains at 1 bar (it must change between heating off and on) is that there is a non return valve before that valve which stops water from your heating system going backwards into the public supply so your pressure will stay at whatever the supply to the house is and in Ireland that is usually not more than 1 bar. You really should close the inlet valve and see how things go.
Good place to help identify fittings
http://www.sanbrafyffe.ie/products.html or www.rwc.co.uk
bottom of this page to see non-return valve which is usually brass [broken link removed]
What should happen when the valve is closed and are there any negative aspects to watch for?
Hi,
Just noticing this post. Our boiler has a label on it saying that normal pressure should be between 1 and 2.
It also says that if below 0.3 you should contact someone.
Ours constantly remains at 0.4 ->0.5 and has NEVER been at normal pressure since we moved into the new house (2 years ago). We only noticed this when it started making strange squeeling noises and having problems with our water pressure so we immediately got someone out to look at it.
We were told it was fine.
It doesn't seem fine to me when you hear the noise and you're having a shower and the water stops coming out.
Is the boiler guy correct in saying it is ok and if so why if the pressure isn't in the normal range? Or should I get someone else out to fix the pressure?
We only noticed this when it started making strange squeeling noises and having problems with our water pressure so we immediately got someone out to look at it.
We were told it was fine.
Another word to complicate issues, most sealed systems will have a small "bottle" air vent fitted at the highest part of the system on top of a piece of 1/2 copper. see [broken link removed] This device will try and trap and release any air in the sytem that reaches it. So by and by during the year it is capturing air that has been hiding in the system and releases it thereby reducing the pressure in the system that needs to be topped up. Remember water contains oxygen (air) and the heating process in the boiler can seperate this air from the water but it does this relatively slowly and only if your boiler is set relatively high.
There are 2 more vents above the boiler also. Is it okay to leave all these vents slightly open?
I'm not sure what these two vents would be. One is likely to be the pressure relief valve which is piped to the outside like a drain pipe. It is r shaped usually with a black knob on top.
I see in your first post that you said semi-sealed and I've never heard of that. What might have been said to you that your heating circuit is sealed but your hot water is vented to your attic tank therefore giving your a "semi sealed system".
Worked a treat!
Our boiler was working agian last night after letting more water into the system. It was most likely due to bleeding all the radiators a few evenigs before but worked a treat so thanks for advice.
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