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Ok, yes I've just found the small cistern which, as you said, was hiding up in the rafters in the dark on a little shelf, all covered in insulation - thanks!! http://imgur.com/a/60u1U So this means it's an open vented system? And the system pressure is achieved by gravity, due to the height of...

Thanks for your replies. I've gone up into the loft and found an expansion vessel, but I think this serves the unvented immersion heater. There are two valves, one with "6 bar" written on it and one with "3 bar" written on it. I'm assuming these are pressure release valves though and serve...

I recently moved to a house with no gas supply, only electricity, and have a Myson Maxton slimline electric central heating boiler, which is used to heat water for supply to radiators within the house: http://imgur.com/a/oe7ON http://imgur.com/a/qXVUq http://imgur.com/a/tiHxH...