For heating the apartment is well suited for wall gas boiler Protherm, which takes up little space and operates at low gas pressure. To make better use of the cottage floor cast iron boiler De Dietrich, whose service life is considerably higher than the wall, it stops the boiler is fraught with razmorazhivaeiem the entire heating system. Pumps. When choosing a circulation pump must be based on water consumption, which can be easily calculated by the formula: G = 0,86 * Q / (TA-to), where G is consumption kg / h, Q – heat flux (heat loss) W, (TA-to ) – the difference supply temperature and return water (usually 20 C) and hydraulic resistance of the system. For two-pipe heating systems houses the hydraulic resistance of about 2 m of water (20 kPa) and 10.8 kPa extinguished by the thermostatic valve, and the rest in the pipes, filters, valves, boiler and so on.
Pump with a small margin, about 30%, but too much can cause the pump noise in the system and excessive power consumption. Excess flow and pump head is adjusted by means of balancing valves. Thermostatic valves. Modern heating systems are simply inconceivable without thermostatic valves. First they just needed to hydraulic and thermal stability of the system, and secondly, to automatically maintain a comfortable room temperature. Moreover, if desired, the temperature can be lowered, for instance at night to 14-16 C for better sleep and to energy savings.
It is recommended to use thermostatic valves with preset, for example OVENTROP. Unfortunately sometimes made ball valves. It should be borne in mind that the ball valves can not be used for regulation, even very rough, because the interim position leads to rapid corrosion of the ball, and also with the time ball 'prikisaet' to trying to open the case and could lead to leaks of glands, and sometimes break Corps, which is fraught with major repairs. In addition, if you close the ball valves in the spring, then the remaining water in the radiator in the summer, due to thermal expansion, can break the radiator. When choosing a thermostatic valve is important remember that this regulatory mechanism, and the whole stroke is less than 0.5 mm. Inaccurate performance and greater tolerances in the construction of cheap models lead to the fact that the valve does not work, and much good has no more than a ball. Leaks defective valve stem on the noise and also, unfortunately, quite common. Replace defective thermostatic valve after several years of work is not so simple, will probably need to change and radiator, because the time is 'prikisanie' the valve to the radiator and the attempt to disassemble the connection leads to the destruction of the thread. It is better to use high-quality valves are proven producers such as Oventrop (Germany). Valve bodies are made of bronze, superior corrosion resistance of brass, and the stem has a double seal.