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I have an unvented cylinder, it is a range tribune he. I called a plumber to look, so far he has changed the temperature relief valve which is on the side of the cylinder and also tookthe expansion vessel down and checked. He said there was no pressure in the expansion and has reset it to 3bar...

I have a pair of urinals feed by a 3 gallon cistern with a 3 gallon auto syphon. My question is can I replace to 3 gallon auto syphon with a 1 gallon syphon. It is drip feed, my boss has asked for me to put a plan to conserve water and this is just an idea. Many thanks