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Thanks for the quick reply gasguru. The new rads are at the opposite end of the house to the mid position valve - the valve is connected into the pipework next to the cylinder at one end of the house & the two new upstairs rads are at the other end of the house in the bedroom above the boiler.

Let me try & explain my problem..... I've moved into a house that has an unvented heating system - uses a gloworm fuelsaver complheat 55 boiler & a IMI Tribune Premier 180 ltr unvented cylinder + Lifestyle 3 port mid-position valve. All rads (about 16 of them) have TRV's except for two towel...

Soggy, Thx for your quick reply - maybe best for me to try & find a local plumber that is familiar with unvented pressurised systems - (easier said than done - phone 3 so far none of them work on unvented pressurised systems....seem alien to them). On a similar vein - my boiler Glow-worm...

Hi, Bear with me I'm new to the forums :) Basically, my home has an unvented mains pressurised heating system - in the utility room is a Glow-worm Complheat Fuelsaver 55 boiler & upstairs in a cupboard is the Tribune Premier pressurised tank with expansion vessel. My problem is that my...