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thanks! Would a burst of that size not be easy to hear though? Can't here anything from under the floors when I have the filling valve open. Boilder house is probably freezing alright, it's been -8 here a couple of night ago and the boiler house is outside and not insulated at all! Do...

nope, no discharge from PRV.

Thanks just checked the boiler manual, doesn't seem to be an integral filling loop type! The PRV is lovated very close to the boiler and relatively close to the EV, about 2 ft away from it, in the same boiler house!

btw don't have instructions for the bolier, and can't find it online!

Thanks Andy, 1. Boiler is Glowworm Micron 2. Ref filling loop, yes that's what I asked the plumber too. He said it was there just not connected to mains, he connected it. Just went out to check the boiler model. There is this gushing sound coming from the Expansion Vessel (the red bad...

We have moved into our current home a few months ago. It's a very old house with relatively haphazard plumbing. Things worked fine until recently when I noticed that the pressure in the sealed system is on 0.5bar and it's not heating the upstairs radiators. Got a plumber that had done some...