Heating system for one and two pipes
The upper layout of the heating system is that the supply pipe is in the attic or under the ceiling. From the supply pipe down the risers with the pipes connected to them are laid, which in turn are connected to the heating devices. The return is laid on the floor or in the basement. Such a system of polypropylene pipes is an indisputable option for equipping a heating system without a circulating pump. 
In other heating circuits, the circulation pump must be present without fail. In addition, when installing a heating system with wiring from the top of the attic, it is necessary to install an expansion tank to protect the system against pressure drops and an air vent.
The lower wiring is characterized by the fact that the straight pipeline runs parallel to the return on the floor of the first or basement floor or in the basement on the ceiling. Such wiring with the use of polypropylene heating pipes is used to organize the supply of coolant for each riser.
The heating system can be single- and double-tube, if you look at the number of pipelines coming off the highway. When installing a single-pipe system, it is necessary to know that in this scheme the pipe is connected in turn to each device in the system. And, from one radiator to another, the further in the system, the coolant loses its temperature. This system is used for large homes, where first they connect to the heating of living quarters, and then subsidiary or household. 
The two-pipe system is designed so that the hot flow and already spent went through different main pipelines - on the direct and reverse. In this case, a coolant with the same temperature will be delivered to each radiator. The big advantage of a two-pipe heating system with polypropylene pipes connected to radiators is that in case of an emergency it is possible to disconnect the problem riser without depriving the whole house of heating.
Heating layout for horizontal and vertical type
Vertical type of wiring, as a rule, is done in high-rise buildings, where the coolant must pass along the risers from floor to floor. With this system, it is possible to repair an individual riser without disconnecting the remaining ones. 
Horizontal wiring is the main riser and a flooring branch in one- and two-pipe versions. This scheme is more modern and is used in new apartment buildings, where each apartment has its own wiring.
In turn, the horizontal type is perimetral and radial.
Perimeter heating system
This system is connected to the central riser and the heating medium moves in sequence through all the radiator batteries located along the perimeter of the apartment or floor. This scheme has its drawbacks:
- when repairing one radiator it is necessary to disconnect the entire perimeter;
- is difficult to drain the coolant, since the wiring is at the same level horizontally.
Advantages of the perimeter system can be called the possibility of hidden installation of trunks in the floor. 
Collector-beam heating circuit
Similar to the previous one, the system is connected to the central riser. The main difference of this scheme is the distribution of pipes in separate rooms like rays to each radiator. A single system of pipelines is formed in the collector near the riser. Disadvantages of this system are similar to perimeter, and advantages - the ability to disable one heating branch, without depriving others of the operability.
When choosing the optimal heating system, it is necessary to take into account the climatic conditions of the place of residence, the number of floors of the room, the load on the heating devices separately, the possibility of emergency shutdown.
