Combi boiler and cutting off water supply

mnjfranks · 31 Dec 2006

Hi

I want to install new bath taps, but have no issolation valve that I can see on the pipes meaning I have to turn off the supply from the mains.

Normally I would be happy to do this, but I have just had a new combi boiler fitted and am worried if I cut off the supply that it may run dry, cut off or do something I cant fix myself.

Any advice on what is the best way to go ahead?

Many thanks guys and gals

Jase

ChrisR · 31 Dec 2006

It's safe, just turn off the mains! Heating can/will still work ok.

mnjfranks · 31 Dec 2006

What a fast response!

How about the pressure in the boiler? Would I need to increase the pressure after?

My thinking is that when I stop the infeed, and drain the taps then the water in the boiler will also be removed.

ChrisR · 31 Dec 2006

No it's a separate sealed system.The filling loop is supposed to be left removed, though few are, but it will have two taps and there's a non-return valve anyway.

mnjfranks · 31 Dec 2006

Well I am confident now then that I can crack on with the work, I thank you Chris for your time and speed.

I was going to ask about the 2 valves on the boiler pipes (I have 6 pipes but 2 have a cut off valves similar to a washing machine pipe 1 red and 1 blue) and wether I have to close them, but will see how I get on!

mnjfranks · 31 Dec 2006

Just thinking

When I run off the hot water tap, the water will come from the boiler and will enpty that.

Still safe to do that? Surely with the infeed closed, and hot water being drained it will run dry....

kevplumb · 31 Dec 2006

no

would be a good idea to switch it off first tho

mnjfranks · 31 Dec 2006

So this would lead to empty hot water in the boiler then which I am worried about I think

kevplumb · 31 Dec 2006

mnjfranks said:
So this would lead to empty hot water in the boiler then which I am worried about I think

in which case you are in a minority of 1 it's not a problem

mnjfranks · 31 Dec 2006

So this is a safe way then.

Will go ahead with that, and refill the system after. I can get the pressure up to 1.2 or so (amateurs!) so guess this is all I need to do.

Ta

kevplumb · 31 Dec 2006

mnjfranks said:
So this is a safe way then.

Will go ahead with that, and refill the system after. I can get the pressure up to 1.2 or so (amateurs!) so guess this is all I need to do.

Ta

all you need to do is turn off the stoptap you won't drain the boiler it's 2 seperate parts heating/water

mnjfranks · 31 Dec 2006

But I will need to drain the bath and sink taps which will come from the boiler

Sorry if I seem very amateurish, but I am

kevplumb · 31 Dec 2006

it's got nothing to do with the heating side of the boiler

turn the stoptap off drain your taps and plough on changing them

mnjfranks · 31 Dec 2006

My thanks to you both

diynot

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Combi boiler and cutting off water supply

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