Vertical buffer containers of variable size are adjusted to the size of the greenhouse. The buffer is designed to provide heat while temporary consumption is greater than heat source efficiency. This situation may occur while the outside temperature is falling. The buffer’s job is also to stabilize the source in such a way that it works evenly at the highest efficiency, thus it also improves the quality of temperature control of the heating medium. The elements of the temperature heating control system have substantial inertia, which causes temperature fluctuations in periods of unstable operation of heat sources or variable consumption of the heating medium. The Sercom computer smoothly controls the operation of the furnace and heating system in the greenhouse. Treated water is used as working medium in installations as a heat carrier. The use of a buffer saves a much heat and allows you to significantly increase the efficiency of the furnace.