Change a radiator with communal heating

Question

I want to change my passage radiator, we cut the water supply to the radiators, there was no running hot water and every radiator was off. We isolated the radiator that we wanted to take off.
I'm on communal heating by the way, as we started to drain the water there was just loads coming out, we stopped at 2 buckets but more wanted to come, is this normal? Or have we done something wrong?

Ben · Accepted Answer

If the valves are turned off on both ends of the radiator it seems odd to get that much water. Of course this depends on radiator spec’s.

I would say double check the valves each end. If it is a combi boiler have a look at the pressure gauge as the system would have dropped if you was drawing from it.

Hope this helps!

Carl · Answer

Hi, yes quite normal, it can take up to 30 minutes with a hose if you’re draining it fully. If you turn the heating trv down to zero and the lock shield down to zero. Then have a bucked at one of the valves, open it slightly then open the bleed key. Wait until this stops dripping, remove and replace.

David · Answer

Hi you need to drain the water completely to take off a radiator so there will be lot of water if you are on the bottom are down stairs.
Fit a hose pipe to drain the water.
You will need to refill the water after you fit the new radiator there a refill valve at the bottom of the boiler.

Saqib · Answer

Hi. Please drain all the water out with a hose pipe. Once removed and replaced you will need to refill the water from the refill valve at the bottom of the boiler. Hope that helps.

Joe · Answer

More than likely the radiator valves are not turned off fully and you are draining the whole heating system. The lock shield valve is a form of isolation valve the TRV is not.

Chas · Answer

Did you turn both valves off either end of rad and if trv fitted you have to take head off and screw on plastic cap to turn off

Jamie · Answer

Would be really difficult to say without seeing. Would depend on the radiator size and of the valves are fully closed. 

Isolation the water wouldn’t cause an issue as heating systems are a sealed system.

I’d advise having a plumbing and heating engineer do the works.

Andy · Answer

Do you have a hot water tank and if so you have to stop the water going into the small cold water tank in the roof and you will have a lot of water coming out to and have to drain down all the radiator to and it best to do this.
Andy

Change a radiator with communal heating

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