In 2013, Gomon continuously extended the research and development direction of enamel hot water storage tank to air energy, geothermal energy, gas heating and other fields, and successively developed a number of new scientific research products. With the rapidly expanded air energy heat pump market as an example, Gomon developed a special enamel hot water storage tank suitable for air energy through repeated research and testing in response to the easy corrosion of the inner coil and poor energy efficiency of the outer coil of the stainless steel liner, which overcame the easy corrosion problem of ordinary copper coils after being internally installed. Besides, it also developed water tanks with built-in high-efficiency and corrosion-resistant copper coil, as well as a series of water tanks with external double copper coil, external double aluminum coil and external “microchannel” coil.