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Thanks for all the prompt replies. I think I'll get the developer to sort it if it's not right. All rads have trv's but I use those to balance the flow rate. I originally thought it was only the one rad near the room thermostat and so turned it off which did improve things, but it is on my mind...

Hello people, I have a pressurised system with hot water tank and a Viessman boiler.I have 2 zones: Downstairs and Upstairs, both controlled by separate room thermostats. Through basic investigation I've realised that there are two rads upstairs that are on the same 'plumbing' (forgive my...