Balancing allows hot water to circulate evenly in the heating circuit for continuous comfort.
The column foot valve (1) and the radiator adjustment tees (2) are balancing elements of the heating system.
Thermostatic or manual valves (3) are used to regulate the heat delivered by the radiators in each room.
Balancing the hot water heating circuit is an often overlooked operation. However, it is essential for the proper functioning of an installation to obtain optimum comfort and the desired ambient temperatures.
A good balance of the heating circuit reduces piping noise and reduces energy consumption by 15% to 20%. Such an imbalance generates sub flows that cause significant temperature differences between rooms in the same house.
The first reflex, to overcome this problem, is to increase the flow temperature on the boiler. This has the sole result of increasing energy consumption, and therefore the bill. To distribute the heat correctly, the radiators must be fed with a sufficient flow of water.
The homogeneity of the temperatures can thus be obtained only by ensuring a correct distribution of these flows. It is still necessary to be able to determine the source of the problem, which can have three origins.
Causes of imbalance
The most common cause comes from a hydraulic imbalance, due to deposits of scale and suspended solids (especially iron oxides) which gradually encumber the pipes. This is called slush. A good flow rate adjustment for all the radiators and a flow measurement allow a precise adjustment.
Two other conditions favor this imbalance: the absence or the bad adjustment of the organs dedicated to the balancing. The other two reasons that encourage this phenomenon are due to a lack of thermal insulation, poor air tightness of the house and poorly sized heat emitters. The first two points are structural.
The latter requires a change in the size of the transmitter. The first step in restoring the hydraulic balance is to strip the pipes and the entire installation.
Intervene on the circuit
This operation includes rinsing and chemical descaling. It is also essential to provide for the replacement of balancing devices when they are no longer operational and to adjust them. Interventions recommended to be performed by a qualified professional.