JohnD said:While Bab has his tea...
There should be no mixing of the water in the central heating and in the taps.
there is a fairly uncommon sort of hot cylinder called a primatic that can let mixing occur if it goes wrong, otherwise, if the hot coil in the cylinder has split - but your symptoms do not appear to match this.
If there was some piping wrongly connected it might allow mixing.
My money is on the vent pipe (expansion pipe) from the circulating boiler water venting hot and dirty water from the radiators. If the vent has been positioned over the cold water tank it can cause the conditions you describe. You need to go and sit in the loft with a torch while the boiler is turned on and off, hot taps run etc.
the vent pipe will (should) be a 22mm pipe, which comes up (usually from the airing cupboard) into the loft, rises several feet up, then is bent down in a curve over a tank so that any water that comes out of it runs down into the tank.
Let us know if this is happening.
Was the radiator water flushed, either with chemicals or a machine? I think this is going to be one of the things you need to do, as well as adding inhibitor when you have got all the loose muck out.
Were your old radiators rusty? Or why did they need to be replaced?
Hello John,
The old radiators were rusty and full of brown sludge. The radiators were not flushed. If the radiators were plumbed in wrong would this be a problem?I know the pipe you are talking about. I will get up there first thing in the morning and see what is going on. If the problem is as you expect how do i overcome this?
Thanks in advance.