Does the water in the warm water tank not circulate without a thermostat?

Hello, it's circulating, but without a thermostat, the circulating system has been in a state of large circulation, and the water temperature itself is slow in winter, which leads to slow water heating, insufficient warm air and high fuel consumption of vehicles. If there is something wrong with the car, ask the car master. 4S shop professional technician, 10 minutes to solve.