The hot-water heating is one of the most popular heating solutions for rooms and buildings. As the names implies, water is used as the medium for heat distribution inside a building. While, the heating process itself is short due to the use of blowing fans in water heating units (water heaters, water curtains), the heat emission is significantly longer than in forced-air heating. The performance and operation of the hot-water installation will make it serve for many years. The heating method is convenient, simple in operation and cost-effective.