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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Boiler pressure
I tried to look in old post but can't find any information so I am
asking. At this time of the year I am turning on the heating in my flat only for couple of hour's in the bath room. All the radiators in the flat are off. The pressure on the boiler is low than normal about 0.7. I know that when the hating is on it needs to be around 1.5 but isn't the fact that only on radiator is on actually mean less hot water in the system and there for less extract which mean lower pressure ? If I top up the system and open more radiators the pressure goes very high 2.5. Thank you for any information |
#2
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Boiler pressure
On 16 May 2007 06:40:29 -0700 Golan wrote :
The pressure on the boiler is low than normal about 0.7. That OK in a flat: 0.7 is about 20ft head which is a lot more than you'd have with a header tank in the flat. Some boilers will cut out if the static pressure cold drops below 0.5/0.6 I know that when the hating is on it needs to be around 1.5 No, it will rise when the system heats up, but there is no minimum figure. If you had a big expansion vessel it might rise to 0.8 and that would be fine. In a flat the concern would be if was rising to 2 or more. -- Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk |
#3
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Boiler pressure
In an earlier contribution to this discussion,
Golan wrote: I tried to look in old post but can't find any information so I am asking. At this time of the year I am turning on the heating in my flat only for couple of hour's in the bath room. All the radiators in the flat are off. The pressure on the boiler is low than normal about 0.7. I know that when the hating is on it needs to be around 1.5 but isn't the fact that only on radiator is on actually mean less hot water in the system and there for less extract which mean lower pressure ? If I top up the system and open more radiators the pressure goes very high 2.5. Thank you for any information From distilling numerous previous threads, the 'norm' seems to be 1 bar when cold and 2 bar when hot. The pressure rise is due to the fact that the water in the system expands when it gets hot and compresses the gas in the expansion vessel, with a consequent increase in pressure. If only *some* of the water is getting hot (the remainder being in unheated radiators and pipes) the pressure rise will be lower. What you are experiencing seems fairly normal - except that 0.7 bar sounds a bit low. Is that cold or (partially) hot? -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#4
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Boiler pressure
In message . com, Golan
writes I tried to look in old post but can't find any information so I am asking. At this time of the year I am turning on the heating in my flat only for couple of hour's in the bath room. All the radiators in the flat are off. The pressure on the boiler is low than normal about 0.7. I know that when the hating is on it needs to be around 1.5 but isn't the fact that only on radiator is on actually mean less hot water in the system and there for less extract which mean lower pressure ? If I top up the system and open more radiators the pressure goes very high 2.5. Thank you for any information Have you been drinking fernox ? Quite simply, either there is sufficient pressure, or the boiler won't work That's all -- geoff |
#5
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Boiler pressure
On Wed, 16 May 2007 06:40:29 -0700, Golan wrote:
I tried to look in old post but can't find any information so I am asking. At this time of the year I am turning on the heating in my flat only for couple of hour's in the bath room. All the radiators in the flat are off. The pressure on the boiler is low than normal about 0.7. I know that when the hating is on it needs to be around 1.5 but isn't the fact that only on radiator is on actually mean less hot water in the system and there for less extract which mean lower pressure ? If I top up the system and open more radiators the pressure goes very high 2.5. Thank you for any information See FAQ ( Sealed CH) -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at http://www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards |
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