There are a few changes that need to be made to my central-heating pipework, for which I have to drain the system down. I am fine with all of it, but I am wondering if it is still OK to use the hot water side of the boiler with the heating system drained? It is a Combi by the way.

Although common sense suggests that the heating and hot water systems aren't linked, someone did say to me before that you should try not to use the boiler atall with the heating system not full.

The changes I need to make will only take 1/2 hour and need to be done now but I aren't getting the new rad/valve for a couple of weeks and as the weather is good, I would have like to avoid refilling the system twice.

The boiler does have frost protection, but I can't see it freezing!!

Any help appreciated!!

 

Christian

It wont take that long to refill and vent a combi system

 

the water system is fine, wont effect it one bit.

 

I did this very thing today, and the boiler faulted low pressure.

 

well ive finished doing my house up after 5 months and the hot water side was always working, the central heating part was never on, half the radiators were off to.

 

I know, but it seems so pointless to refill and vent a system that almost certainly won't be needed for a few weeks, when it will need doing again when I get the new rad.

In any case, I don't think I will take the risk. I will fill it as soon as I have done my work.

Thanks guys!