In this system there is a central column with two pipes. One for the supply and the other for the return of water. Through the central column the hot water is transferred from the boiler room to the heating space, where it heats up the radiators and returns back to the boiler

room, in order to warm up again and repeat the same procedure.
What characterizes the single pipe system is the cascade connection of the radiators in circuits of 2-4 heating radiators.
In that way, the pipe that begins in the inlet collector having reached the first radiator of the circuit sends the quantity of water to the radiator through the valve, and the rest- after mixing with the

return of the radiator- is directed through the bypass of the valve to the next radiator of circuit. The same process is repeated there until the last radiator of the circuit. After the water returns to the return collector and from there through the central column goes to the boiler room.
The main characteristic of the specific system is that the radiators do not have the same temperature. The temperature of the water decreases from the first radiator to the last. That is why it is necessary to increase the surface of the radiators (reverse of their turn).
The single pipe system offers many advantages like the opportunity of autonomy (per apartment, floor or area), the quick and easy installation, economy of materials (mainly in pipes), but also better control of the installation.
The pipes that can be used in this heating system are:
By using the above mentioned pipes with corrugated pipes SOLICOR we obtain not only the insulation. In this way their main advantage compared to metallic pipes is the opportunity of an easy replacement of the internal water pipe in case of problem, without the need of dismantling the floors and causing costly damage to the place of installation.



This system is similar not only to the two pipe system, but also to the single pipe system and is called radial, because the radiators are connected with the central column radically.
Like in the single pipe system, There is a central column with water distribution collectors on every floor. The only difference is that each circuit supplies only one radiator.
That means that the whole amount of the water that leaves the collector inlet enters the radiator, heats it and then goes back t

o the return collector and from there to the boiler room. The radiators in this system have theoretically the same temperature, so no increase on their surface is observed. Because of the smooth inner surface of the plastic pipes the water inside them moves with double speed in comparison with the copper pipes. At the horizontal routes no slopes are required.

The basic advantage of this system is that it combines high water speed with stable and high temperature of radiators (no increase on the surface of radiators is observed- saving on radiator’s surface 10-15% compared to the single pipe).
The basic disadvantage is that it requires many meters of pipe (60%-70% more than the quantity required for single pipe system). That means higher installation’s cost.
Pipes that are used for this system:


This system is applied in houses that are already build and no heating installation exists in them.
The pipes are visible because they are
installed along the vertical walls, just below the confluence with the ceiling. They must be slightly inclined (~1%) either upwards or downwards in order to release the air of the circuit using automatic air vent at the higher points of circuit. Through these pipes the hot water passes to all radiators of the apartment. The pipes recommended for this type of system are composite pipes AL-PERT-SOL in linear sticks.