Sealed system boiler


Postby paulride » Fri Oct 02, 2009 12:39 pm

does a boiler for a sealed system have to positioned above all the radiators?
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Postby plumbbob » Fri Oct 02, 2009 9:28 pm

No
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Postby paulride » Sun Oct 04, 2009 6:35 am

[quote="plumbbob"]No[/quote]

I was told that if the boiler is to be fitted below any of the rads in the house it must be filled 'under pressure'?

Is this correct?
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Postby Steve the gas » Sun Oct 04, 2009 9:45 am

A sealed system is under pressure approx 1.2 bar normally.
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Postby plumbbob » Sun Oct 04, 2009 3:50 pm

I am not quite sure what you are asking here. I don't understand "filled under pressure"? All sealed systems are pressure filled.

Where exactly the boiler is situated in relation to the radiator heights is immaterial. I would guess in domestic installations, the majority of boilers are below the height of the upstairs radiators.

The only consideration with pressure is the minimum required to fill the system. If we imagine the boiler in a basement of a house with heated attic rooms. Given that the highest radiator could be, lets say, 7 metres above the pressure gauge on the boiler and each metre head of water is about 0.1 bar, the gauge in the boiler would have to read 0.7 bar before the attic radiator would fill.
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Postby DEEARR2 » Mon Oct 05, 2009 7:06 pm

Even if your heating system is conventional and not pressurised the height of the feed & expansion, usually located in the loft space, well above the system, will be sufficient to feed all radiators.
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