TGD L 2011 – 2.2.2.1 – BUILDING SERVICES Heating appliance efficiency

2.2.2.1 The appliance or appliances provided to service space heating and hot water systems should be as efficient in use as reasonably practicable. Guidance on appropriate efficiency for various systems and fuels is contained in “Heating and Domestic Hot Water Systems for Dwellings – Achieving compliance with Part L 2011” (to be published). For fully pumped hot waterbased central heating systems utilising oil or gas, the boiler seasonal efficiency should be not less than 90% as specified in the DEAP manual and the associated Home-heating Appliance Register of Performance (HARP) database maintained by the SEAI (www.seai.ie/harp). Effectively this requires the use of condensing boilers. In a limited number of situations involving replacement of existing boilers, provision of a condensing boiler may not be practicable. Detailed guidance on the assessment of specific situations to identify those where provision of condensing boilers is not practicable is given in “Heating and Domestic Hot Water Systems for Dwellings – Achieving compliance with Part L” 2011” (to be published).

C:BCARTGDtgd LTGD%20L%20DWELLINGS%20-%202011TGD%20L%20-%20DWELLINGS%202011%20-%20SECTION%202.2.2.1.pdf