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Hi. I have a customer who wants me to fit an unvented cylinder in the atic of his offfice.... problem being its imported from poland and doesnt seem to be up to standard. It is directly heated by electric as far as I can tell from the manual which is very limited with information it has an thermol cut off but there is no temeprature releif fitted within the cylinder. No expansion vessel or prv the only thing it has come with is a small expansion relief to be fitted on the cold water inlet with a hole no bigger than 10mm. Also the connections are 15 mm for the hot and cold and the elctric is on a 2 pin plug . Its come with a CE sticker so is admant it can be fitted. I have told him it cant . Was just wondering of anyone elses view on this . THANKS