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Thank you so much for the explanation.. I have never worked with gas boilers before, back home I had diesel. This has been enlightening. I will be getting an engineer to change the relieve valve and have them go over the whole thing.

Thanks a lot for your help. Here is a closeup of the loop, would these 2 slots be valves?

Hi! Would really appreciate some help on this.. I got a 24c glow worm, and the water pressure has been at 3.5 cold and 4 when hot. I read around and seems that mains is open on the internal loop, but i cant seem to close the mains. here are some photos thats the boiler with the pressure...