Positive-displacement gas water heaters and hot water storage tanks can be used for the allocation of hot water supply in medium-restaurants,hotels,guest houses with advantages such as minimum investment, smaller size,higher capacity,better environmental protection.

In order to accurately design the insulation structure of the solar hot water tank in a villa solar heating system for a solar company,the Fluent software is used to simulate and analyze the feasibility of the thermal storage system.

The multimode approach was used to describe thermal tank temperature stratification,that was applied to the living in of solar energy heating system,researching on the temperature stratification effects solar heating system performance.