Closed and pressure-resistant design, working with a water connection, hot water is supplied by mains pressure. Possibility of connection to heating equipment such as boilers and heat pumps for hot water storage and occasional use. Equipped with a water return port that can be connected to the device, cold water will be heated, which is very convenient and saves water for users. Equipped with a one-way safety valve, which ensures the safe operation of the water tank. The anode rod prevents corrosion and prolongs the service life of the tank. The floor installation method is suitable for various environments.