Here is all you need to know about replacing your boiler. You have a combi boiler you want your new combi boiler in exactly the same position. Is there anything wrong with this page? Don’t miss this limited opportunity to replace your boiler or furnace with a more energy-efficient model and save! Learn the essentials to maintaining the hvac system in your home. Up to â£1,000 cheaper than our competitors. We'll be happy to answer any questions you have. Had an emergency in the.