Consider first the choice of power system, since other issues are discussed in the relevant sections. Each of the systems in the range of all manufacturers is designed for installation on a particular area, eg, 2-4 meters These power chosen from the condition that the specific power system must comply with heat loss in the surrounding area of this room and the length of the section allows you to produce a layout in this area with possible steps (from 5 to 15 cm). Methods of accurate calculation of heat loss is described in snip II-3-79, but for simplicity, should be calculated for the conditions of Central Russia and averaged conditions of construction, from the values of 120-140 W / sq. It should also be noted that heating section, usually falls on some (10-20 cm) away from the walls, while even more comfortable – only free furniture area. Thus, when the main heating device in a room 3 x 5 m to choose a system capacity of at least 140 x 3 x 5 x 1.2 = 2.5 kW, while at the device comfortable heating will be sufficient to establish a system for free from the furniture area of 9 sq. m.
120 x 9 x 1.2 = 1.3 kW This safety factor is taken 1.2. Obviously, that from one or another answer to the question of appointment of power has changed almost doubled. The calculation is very simple, but usually have to take into account the particular premises, which include: first and last floors of buildings rooms with large glazing – conservatories, bay windows, balconies premises with insufficient thermal insulation enclosing structures (thin walls, balconies, etc.).