Combi Boilers

Information for householder Gas-fired boilers installed after 1 April 2005, and oil-fired boilers installed after 1 April 2007, must be condensing boilers, whether they are replacements or new installations. This is a requirement of the Building Regulations for England & Wales, Part L1 (Conservation of Fuel and Power). In exceptional circumstances it is permissible to install a non-condensing boiler instead of a condensing boiler, provided that an assessment of the property by a competent person confirms that the additional cost of installing a condensing boiler is exceptionally high. The assessor must identify the lowest additional cost for an installation anywhere in the building, irrespective of the boiler position chosen by the owner. When the boiler is fitted, whether it is a condensing or non-condensing boiler, it need not be in the position shown on the assessment form. The completed assessment form should be retained as evidence of compliance with the Building Regulations. It may be required when the house is sold.