If a radiator is partially cold (for example, the upper corner fails to heat up) or you hear a gurgling water sound coming from the pipes when the system is running, it means air is trapped in the system. Bleeding is done via the special Mayevsky air vent valve located at the top end of the radiator — use a radiator key or a flathead screwdriver to gently loosen the valve until water, instead of air, begins to flow out. After this procedure, make sure to check and top up the pressure in the boiler.

A condensing boiler is a modern, highly efficient appliance that recovers and uses the latent heat from water vapor within the exhaust gases to reheat the system. It consumes 15% to 20% less natural gas compared to a conventional boiler. However, to maximize its efficiency, it requires a low-temperature system setup (such as underfloor heating or oversized radiators, where the water temperature does not exceed 50°C).

Modern heating boilers are equipped with highly sensitive electronic control boards. Voltage fluctuations or sudden power drops are the leading causes of these expensive boards burning out. A quality stabilizer protects the appliance from electrical damage, while a UPS ensures the boiler keeps running during blackouts, preventing the system from freezing in winter.