What products do hotels use for heating?

The hotel is a place that needs a lot of heating. It can use solar energy for heating, which can greatly save the cost, and then it can do a lot of heating. But solar energy heating also has some defects, that is, the heating is unstable when the weather is bad. But there is a solution to the Four Seasons Muge. Their solar energy is photoelectric, and when the light energy is insufficient, they can use electric energy for heating, which ensures the 24-hour heating demand of the hotel.