Recent content by rymacg

Ok that's much clearer now , thanks for taking the time to explain. If Potterton had shown this in their CH Mode diagram maybe I would have understood sooner. Thanks again.

Really appreciate you getting back to me hertsboiler, looking at the manual for the 28i it shows that in CH mode the internal exp vessel is not included in CH circuit only the DHW circuit and this is where it confused me, sorry if I sound like I'm thick but I was just trying to understand how...

Ok thanks very much I think I've got it now, what confused me was thinking the internal exp tank was there to allow the water in the CH to expand and retract but this obviously not the case.

So the exp vessel in the 28i holds and heats water for DHW system, that being the case there is no exp tank for the CH.

Not worried so much as curious, CH working great no leaks and no loss of pressure, appreciate everybody's help.

l'm a little confused here, if therè are two water connections and one is CH and the other is DHW as the manual says, there must be three compartments in the exp vessel, I need a drink ha ha Merry Xmas.

Thanks gas112 but as dilalio says the CH and DHW primary circuits must mix in the exp vessel, is that correct?

Ok thanks for the swift replies, I have replaced the PRV as there was a discharge but I just wondered if the exp tank had three separate compartments considering the Performa 28i is supposed to supply instant hot water to the DHW system.

I have a Potterton Performa 28i boiler and there was water coming from the valve in the expansion tank so I assumed the tank was u/s, the manual says it is necessary to remove the boiler to fit a new one so I fitted an external expansion tank and all seems to be fine but my question is that I...