| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a tank unit, a hot water system, and a formable heat insulation material which are excellent in a heat insulation property and reliable for a long time.SOLUTION: A tank unit includes a tank storing liquid, a box accommodating the tank, and a formable heat insulation material provided between the tank and the box. Rigid urethane foam is used as the formable heat insulation material, and includes a first active hydrogen containing compound having the number of active hydrogen groups of 5-8, a second active hydrogen containing compound having the number of active hydrogen groups of 4, and polyester polyol having ester group and the number of functional groups of 2-3.</p> |
