Let’s first deal with the question of what a radiator is? Heat -heated coolant heated to the desired temperature, located in a heating device with liquid heating — this is the radiator. There are four classes of heating systems: panel, tubular, plate and sectional. We will deal with each group separately. Let’s start with panel radiators. They have a rectangular panel, inside of which there is water that they heat. Steel panels belong to the group of convective panels. Concrete and other types belong to a group with lower temperature heating surfaces. Tubular radiators consist of steel tubes located vertically and combine the lower and upper manifolds together. In plate radiators, a heating element is steel or copper tubes on which, there are thin plates and all this is covered with a casing or a decorated grill.