Appliance efficiency

Older appliances typically operate at only 60–70% efficiency. Modern condensing appliances, however, can exceed 90% efficiency and are available as regular, system, and combination boilers. Installing a condensing appliance is an excellent way to reduce running costs compared with non‑condensing models — you could achieve fuel savings of up to 30%. To comply with building regulations all new or most replacement boilers must be of the condensing type. Non-condensing boilers can only be fitted if the building qualifies for an exemption which is based upon an assessment of the technical difficulty and cost associated with installing a condensing model.