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Can't believe that a "qualified plumber" and an "rgi" can't figure out between them how to do this. Best of luck with the boiler. And best of luck with the Vaillant.

You need 870 minimum for that boiler with a rear flue. I suggest you have a chat with your installer and have a re think.

What boiler are you having?

I use a company called Kitchen Economy for appliance parts. located in Cardiff but do deliver. 02920 451222

I'd put money on it being the diaphragm. Rhondda valley rgi

Did you change the diaphragm?

ffs Dan...........stop................i'm fookin crying here!!!!

The manufacturers instructions should have a diagram showing all required clearances. What make and model?

could be a variety of things, diaphragm, diverter valve, flow switch, thermister, pcb etc etc.

Have a look at Intergas

First class tw*t. Hopefully the only person to die will be him cos hes too dumb to be of any use to anyone.

Personally I would choose Intergas, Atmos or Viessmann.