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Hi, did you sort out the problem as I am having exactly the same on my baxi 80 eco.

Sorry to be a pain, but I've spent all yesterday looking round the whole of the system for leaks and can find any.I've also put on a new PRV just to be sure it's not that and checked the expansion vessels not got water in and repressured that. The pressure has still droped 1 bar over the day...

After my last post I realised I was wrong about the pressure going up when the heating is turned on, it does by about 1 bar but the pressure jumps up still when the hot tap is turned on. I have now also turned off the boiler, pressured the system up to 2 bar, isolated the flow and return...

Whilst searching for leaks around the boiler, the girlfriend mentioned that the pressure seems to drop quicker after running a bath. On further investigation the pressure does not seem to rise when the heating is turned on but jumps (0.5bar) up almost immediatly when the hot tap is turned on...

Have checked the rad valves yesterday and found one that had a slight leak. I have tightened it up and its now ok but the pressure has still dropped from 2bar to 1.5 during this afternoon.

Have had floorboards up yesterday and checked all pipes cold and with heating on and everything is bone dry. We usually run it around 2 bar.

Hi, I have an annoying problem with a Baxi 80 eco. I am losing pressure over a few days, I have checked the system for leaks and found a few (some quite bad) and fixed these but it seems to have made the pressure drop even quicker. Have also replaced the pressure relief valve and some o rings...