My insulated heating 22mm ring main has been up there for years, as they mostly are in bungalows, and boiler cabinets are insulated, probably even better now than my current 11 year old boiler ?Your dead right there town , I refuse to fit em why would you put a gas fired boiler to heat your home in the coldest harshest environment I could write a book why not to do it but will end it there my advice dont do it . Kop