| 摘要 |
PROBLEM TO BE SOLVED: To acquire a boiler water supply heating system capable of improving combustion efficiency of a boiler at low cost.SOLUTION: A water supply heating system has a first water feed line 3 and a second water feed line 4 for feeding water from a water supply source to a boiler water supply tank 2, and it heats the feeding water flowing in the second water feed line 4 by a heat pump 9 and feeds water to the boiler water supply tank 2. The water supply heating system sets a specific temperature as a threshold value for the temperature of water supply of the water supply source beforehand, and when the water supply temperature of the water supply source is equal to or more than the threshold value, it gives priority to a water feeding operation from the first water feed line 3, and when below the threshold value, it gives priority to a water feeding operation from the second water feed line 4. |
