A powerflush is a method of removing dirt and debris from your heating system. Sludge will build up in your radiators and create cold spots.This means your boiler will work harder to heat your radiators and your home and use more gas to achieve this.
When you powerflush your central heating system this helps extend the lifespan of the boiler due to the boiler not working so hard to heat your property. A boiler that is working harder than it should could result in expensive breakdown repairs.