hi Everyone,
can anyone tell me how to check if a plumber is G3 certified to install unvented hot water systems please?
i know the plumber is gas safe which is separate from G3, i believe. apart from taking the word of the plumber, is there an official way to check?
thank you
can anyone tell me how to check if a plumber is G3 certified to install unvented hot water systems please?
i know the plumber is gas safe which is separate from G3, i believe. apart from taking the word of the plumber, is there an official way to check?
thank you