Worcester Bosch 24cdi heating drain down- hot water?

churchilldog · 10 Aug 2010

I have a Worcester Bosch 24cdi boiler, I need to drain down the heating to add a new radiator into the system- quite happy doing all this and refilling.

BUT, once I have drained down the central heating, can I still switch on a hop tap to call for hot water or would this cause some damage to the boiler- I am thinking possibly the heat exchanger may get too hot?

Thanks,

CD

OLLIE20 · 10 Aug 2010

Generally not good to run with no pressure, if boiler high up on system will o/ht anyway, are you adding complete new rad or replacing one like for like?

hav it · 10 Aug 2010

i dont know really why you would want to do that,and the answer is no, low pressure on the ch side will prevent the boiler firing hw mode.

churchilldog · 10 Aug 2010

Adding complete new rad and pipework. Just a really small one to sort a cold spot.

When I refill I will be adding inhibitor and boiler noise reducer.

I thought boiler pressure only referred to the CH side?

churchilldog · 10 Aug 2010

hav it said:
i dont know really why you would want to do that,

In case I need to wash my hands!

OLLIE20 · 10 Aug 2010

It doest but its the CH water that heats your DHW through the plate heat exchanger (silver like sardinde looking thing) behing control panel, the job shouldnt take more than a day should it????? cant you last without HW for that long??????

OLLIE20 · 10 Aug 2010

Why the noise silencer????????

churchilldog · 10 Aug 2010

OLLIE20 said:
Why the noise silencer????????

It developed a whistle when on CH a couple of years ago. Limescale in the HE. The noise reducer kept it quiet then, so its going back in now!

OLLIE20 · 10 Aug 2010

Well if it worked for you before, cheaper than replacing heat ex i suppose

churchilldog · 10 Aug 2010

OLLIE20 said:
Well if it worked for you before, cheaper than replacing heat ex i suppose

Yes because I caught it early it stopped the problem getting too bad. Early reactions save lots of money!

bengasman · 11 Aug 2010

churchilldog said:
...When I refill I will be adding inhibitor and boiler noise reducer...

That would suggest you have a problem with the boiler already. How ofthen do you need to top the system up?

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Worcester Bosch 24cdi heating drain down- hot water?

hav it

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