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。
Based on the climate and energy price in Shanghai, gas engine driven heat pump can save about 23% primary energy and 11.3% running cost.
根据上海地区的气候条件和能源价格，燃气机热泵比电动热泵能节约至少23%的一次能源和11.3%的运行费用。
A variable displacement pump could save energy during the long holding time.
变量泵可在长的保压时间内节省能源。
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