SURVEY ON METHODS OF ENERGY CONSERVATION USING OIL-FIRED HOT WATER HEATERS FOR RESIDENTIAL USE IN HOKKAIDO

In order to consider the energy saving methods of oil fired water heating in Hokkaido households, an actual condition investigation on conventional and latent heat recovery water heaters, was performed. The following results were obtained: 1)Latent heat recovery heaters heated water 10-12% more efficiently than conventional heaters. 2)The water heating requests lasting under 30 seconds had little influence on the daily efficiency of hot water heaters. 3)As a result of case study, lowering the hot water heating temperature by 2.0 degrees centigrade reduced energy use by 5.9%.