As temperatures in Beijing begin to fall, some heating providers will start testing the water pressure in their heating systems area by area. Due to differences in the scales of heating systems and residential communities, there is no unified citywide schedule for testing. Residents are advised to check the notices posted on community bulletin boards or WeChat groups for homeowners to learn about the testing arrangements and make sure that someone is at home during the process.

The term "water pressure testing" refers a process where, before central heating is officially turned on for winter, cold water is circulated at a designated pressure level round the heating pipes. The process may go on for several days.

FAQs:

Q1: How should I bleed air from a radiator?

During the testing period, if you hear the sound of water flowing in your radiator, you can report it to the heating service provider for repair. Alternatively, you can manually bleed the air from the radiator by using the vent valve, which is typically located on the top of one side of the radiator. To release the air, use a tool to slowly rotate the valve, and stop rotating immediately upon hearing a hissing sound (which indicates that air is escaping). As soon as water begins to flow out of the valve, promptly close it.

To prevent water from splashing and staining walls, you can first cover the vent valve with an item such as a perforated plastic bottle, a basin, or a cloth. If you accidentally completely unscrew the vent valve, and the system is equipped with an individual shut-off tap, turn it off immediately and contact the heating service provider for repair.

Q2: What should I do if my radiator is leaking?

During the water pressure testing period, if you notice a valve beginning to leak, refrain from forcing it shut or otherwise manually operating the vent valve without guidance. It is advised to keep some dry cloths to hand. In case of any leak, the most effective temporary solution is to wrap a cloth tightly around the leak point to slow down the water flow. After implementing this quick fix, contact your heating service provider immediately for repair.

Kitchens and bathrooms are the most common areas for heating system leaks, as higher moisture levels in these spaces can accelerate pipe corrosion. Special attention should be paid to the joints where vertical heating pipes meet the floor, as these connections are particularly prone to leaks.

If you notice water leaking from heating pipes in areas such as hallways or courtyards, report the issue to your heating service provider as soon as possible.

Q3: Is it better to release more air?

Bleeding air from your radiator is not a case of "the more, the better" or "the more frequent, the better". Typically, when you open the vent valve, you will hear a hissing sound as air escapes. Continue bleeding until water begins to flow out of the valve (which indicates that the process is complete). This usually takes about five minutes. Releasing excessive water can destabilize the pressure within the heating pipes, potentially affecting the entire heating system.

(Source: Beijing Daily App)