| 摘要 |
<p>A circulatory type water heater having a heat source and circulation system with a heating branch and a parallel pipe system with a domestic water heater supply system connected to it, such that both systems are operated by a common circulation pump. It is constructed such that there is a heat cumulative coating or jacket (23) around the internal mantle surfaces of the water heater. The internal surfaces of the heat source are not coated, but the remaining surfaces are covered in a coating applied by a dip varnishing or other technique.</p> |
