In one-pipe hot water circuits through all the devices in series: cooled in a single device, it goes to another and so on to the back line. In double circuit hot water runs from the supply pipe to all devices in parallel at the same temperature. Of each instrument water returned to the boiler through the return line without going to other devices. Single-tube systems require less pipe and fittings. Therefore, they are easier to install and configure.

They are cheaper than the two-pipe by 40 percent, and if lucky with the designer, then a factor of 1.5-2. However, only some of their species might be a temperature control device, and a beautiful interior with them to get more complicated. In two-pipe systems can be easily control the amount of heat supplied in the room, and in each unit by installing the thermostatic valves. This means that the home can save heat and at the same time provide a comfortable temperature. About thermostatic valves can say: 'small but precious. " After reducing the average temperature in the house at 1 C reduces energy consumption by 6-10%. In the market of popular thermostats firms HERZ, OVENTROP, HEIMEIER (Germany), DANFOSS (Denmark) ON 'Teplokontrol' (Kazan).

Two-pipe systems are more expensive (need more pipes and valves) and time-consuming to adjust. For quality settings of different systems on the market today are special control valves, flow and pressure regulator, which is set on the supply and return risers. On the characteristics of routing schemes affect the building architecture and interior.

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