In recent years, with the application of high-rise buildings in the city to support the use of solar energy, balcony wall-mounted solar water heaters are well known in the market. At present, the world’s solar thermal utilization industry is stepping into the transformation and upgrading, no longer satisfied with the primary needs of the solar water heating system, but to the advanced demand for easy to use and durable. The issues of concern to property developers and users have also undergone qualitative changes, from "whether the product is easy to use" to "whether there is comfortable hot water." This also means that existing products are in urgent need of innovation and upgrading.

Solar energy is an unstable energy source, and a simple balcony wall-mounted solar water heater is difficult to meet the needs of consumers for all-weather hot water use. The solar-gas integrated water heater focuses on technological upgrading from this aspect, integrating the use of renewable energy (solar energy) with clean energy (gas).

Solar-Gas integrated water heaters are not a simple combination of solar water heaters and gas water heaters. Therefore, they are different from ordinary solar and gas complementary systems. The solar gas integrated water heater solves two major technical problems. First, high temperature resistance. When the sun is sufficient, the water temperature in the solar water  heater will be very high, possibly reaching nearly 100 °C. This is a great test for ordinary gas water heaters. Smarki specially designed gas water heater can work for a long time at a high temperature of 85-98 °C without failure or deformation. Second, the Solar-Gas integrated water heater is highly integrated, and the automatic switching technology is directly integrated into the water heater without the need to connect the three-way valve to realize the intelligent temperature control of the solar energy and the gas, and the hot water supply can be maintained 24 hours a day.

Satisfying the requirements of “comfort + comprehensive energy saving contribution rate”, solar energy integrated water heaters use solar energy as the main energy source. When the water temperature of the hot water storage tank is higher than the set temperature, the gas water heater does not operate, and the heat storage is directly used. The hot water in the water tank; when the water temperature of the hot water storage tank is lower than the set temperature, the gas water heater is automatically operated to maintain the constant temperature hot water output.