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Hi Agile He was recommended to us - and yes, was corgi registered. Have a pile of paperwork. No warranty probs either, as Vaillant have already been to fix a problem with the expansion vessel in the boiler. Sorry you think it's a cowboy job though. What concerns you, apart from the...

Thanks for your replies! Sadly, there's no 22mm left in the heating circuit now. Only the flow and return to the hot water tank is 22mm. The 15mm heating circuit starts just past the motorised valve. However, I could run 22mm from the motorised valve down to the first floor without too...

The Boiler is an Vailant ecotec plus 624 The old boiler was an ancient ideal mexico, situated in the kitchen. It had 22mm pipes serving the ground floor (splitting immediately into 15mm) and 22mm flow and returns heading upstairs to serve the 1st floor and attic conversion. (The connections...

...the boiler used to be in the kitchen. The lockshield valves on the ground floor are fully open, about 1/3 turn open in the attic and somewhere in between on the first floor

Can 15mm pipes serve the heating for a whole 4 bedroom house with 2 bathrooms? We recently had a new boiler put in the attic and the installer simply joined onto the 15mm rad circuit there. That's left us with a 15mm circuit wandering round the house, visiting the old boiler site, old tank...