On the first filling of the hot water heating system or refilling after maintenance, air in the piping and radiation must be removed and the whole system filled with water.

在对热水加热系统进行首次进水或维护后在进水，管道和散热器内的空气必须被排除出来，整个系统必须用水充满。

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We are installing the hot water heating system.

我们正在安装热水供暖系统。

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This paper states the method of selecting and using circulating pump in hot water heating system properly to save electric energy.

合理的选择和使用热水供暖系统循环水泵，以达到节约电能的目的。

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The 59-acre (24 hectare) site will also boast a solar thermal hot water system to pre-heat the water for the heating system, and a biomass boiler that will provide heat using locally-sourced wood chips.

BBC: Bristol and Bath Science Park gets new solar roof panels