Yes, in most cases a combi boiler will help save money. Modern A-rated combi boilers are highly efficient, which means they convert a greater percentage of fuel into usable heat. They also avoid the energy losses associated with hot water storage tanks.

In addition, because combi boilers heat water only when needed, you are not paying to maintain the temperature of stored water. Over the course of a year, these savings can add up to hundreds of pounds, particularly when replacing an old G-rated boiler.