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在燃气浸没燃烧热水器中设置了多级余热回收装置，使热水器的热效率达到 94．7％（按高位热值计）．通过对水质和废气进行检测证明该热水器符合现行环境保护的要求．
In the gas submerged combustion water heater set up a multi-stage waste heat recovery device, so that the thermal efficiency of water heaters up to 94.7% (according to the high calorimeter). Through the water quality and exhaust gas testing proved that the water heater meets the requirements of the current environmental protection.