Q how much will a replacement boiler cost? Stay safe and make sure your engineer is gas safe registered. See our great oil and gas offers over the cold season - they'll be sure to keep you warm! Shape the end of a coat hanger into a u shape push this down into the drain and pull out it will bring hair with it and help you to get that drain cleaned. Upgrading your old boiler to an a-rated baxi boiler will save you money in the long run.