It’s estimated that you can cut your gas bills by an average of £300 a year by replacing any boiler that’s more than 15 years old. The EST reports that condensing combi models are extremely energy efficient because they convert at least 86% of fuel into heat, compared with 65% in old boilers.
Combi boilers not only save you money but also significantly reduce your carbon footprint. Another reason why combi boilers are so popular is that they’re compact and can fit easily under the stairs or in a kitchen cupboard in order to save space. Combi boilers, however, do not suit every household because they struggle to supply hot water to more than one outlet. They are most suited to smaller properties with one bathroom, like a flat, maisonette, cottage or bungalow.