How to ensure the constant temperature of swimming pool water in hotel swimming pool?

To keep the temperature of swimming pool water constant, a heating heat source is needed. Because of the standard of swimming pool water, the water temperature needs to be constant at about 28 degrees. If there is no heat source to heat the pool water, the water temperature can hardly be maintained at 28 degrees. At present, air energy heat pump, solar heating panel and boiler are the main heat source equipment in the market. Combined with the current national environmental protection policy and energy saving policy, air energy heat pump mode is the most suitable mode at present. For example, in Yunnan province, where the sunshine time is long, the heating mode combining heat pump and solar energy can be adopted. The daily operation cost of this mode is relatively low, and the initial cost is higher than that of using heat pump alone, while the boiler mode has high operation cost and great environmental pollution.