Whats your thoughts on this just been to price a boiler change, Was going to use a 637 system (LPG) only to be told by Vaillant that they now have to come out and do the conversion ! at a cost of £120.00,+vat, they cant give a date to do it as they do not have the kits, Told them in no short terms what to do with their boilers, its hard enough trying to keep costs down to get some jobs , but to be hit with almost another £150 on top is takeing the P