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C do you have a red balancing valve on the outlet of the tank? it might be worth a try closing that more and see if that helps to keep the temps in the store. Where is the valve set to at the moment?

haha ill need to get you round to compare. the system might need drained and cleaned a couple of times if there is so much dirt in it, also i was considering jumping out the rads and putting a loop on at the pump then filling with F3/water to see if circulating just the tank would make a...

I have just moved into a house in december and ive have what sounds like the exact same system only mines is worse! I can get the store to 80C (as advised by Macdonalds) but as soon as the CH comes on the store drops to 40C and doesnt go above this till the CH goes off. (macdonalds suggest...