Are Combi Boilers classed a High Efficiency Boilers?
Yes. All the Combi Boilers that go green plumbing and heating have available for sale are classed as High Efficiency Condensing Boilers. The high efficiency of these boilers is achieved by recycling and abstracting the heat from the exhaust gases where, in non-condensing boilers, the heat present in the exhaust gases is wasted to the atmosphere.