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Cheers il try that. 

Yup the only king in Ireland. Since the riellos are the same. bar the setting nd nozzle. I think I will chance it nd achieve condensing sumhow 😊

Euros. I live on a small island. So I do the installation nd plumbing myself. But I will eventually need someone to analyse it. Just isn't as easy as picking up the Fone but I'm learning

It's a none combi. I got a calculation for the rads nd cylinder for a 26kw. Just wondering should I buy the 36kw nd derate it. Cause I am saving a grand in buying new. 

Yeah I was thinking that. Nozzle is reduced on the 26kw air intake is reduced. But out pressure stays the same according to the specs. Only difference in the boiler it self is the 26kw hold 19lt of water where as the 36kw is 24lt. So I think it's possible as long as I get it analysed afterwards...

True. That is grand for a standard boiler. But but a condenser need an output of 70deg and a return of 50 for it to start condensing. With an over powered boiler it's wil be constantly going off and on to often to reach efficient condensing point. 

Condenser boilers don't work properly wen the are to high powered for the size of the house and rads. 

Can any tell is it possible to de rate a firebird 35kw condenser boilerhouse to a 26kw by reducing the nozzle size and the air of the riello to the 26kw specifications.