How to Bleed Air from Vacuum Tube Solar Energy?
Air bubbles in the system prevent water circulation and reduce efficiency. In this guide, we explain the symptoms and causes of air in the system and the step-by-step air bleeding process.
5-10
Minutes
Easy
Difficulty level
1 Person
Sufficient
0₺
Cost
📑 Contents
Symptoms of Air in the System
If there are one or more of the following symptoms, there is air in the system:
Irregular, interrupted water comes from the faucet. Flow rate is variable.
Clanking, gurgling or bubbling sounds are heard.
Hot water does not come as hot as before. The system works inefficiently.
When you open the faucet, air comes first, then water.
How Does Air Enter the System?
There is air in the newly installed system. It must be discharged during the first fill.
Air can enter after operations such as tube replacement or pipe repair.
Air can enter the system during a mains water cut.
Small leaks at connection points can suck in air.
Boiling water can create air bubbles.
Be careful when working on a hot system! Water can be over 60°C and cause burns. Always use gloves and keep your face away from the vent.
Step-by-Step Air Bleeding
Turn Off the Main Valve
First, depressurize the system:
- • Find the cold water inlet valve (usually at the bottom of the tank)
- • Close the valve completely
- • Open a faucet to reduce pressure in the system
Locate the Air Vent
The air vent (purjör) can be in these locations:
On top of tank
On the manifold
💡 Some systems have an automatic air discharge valve.
Loosen the Air Vent Valve
Main step - be careful:
- • Use an adjustable wrench or pliers
- • Open the valve only half a turn (do not open completely!)
- • Place a water bucket under it
- • You will hear a "hissing" air discharge sound
Slowly Open the Main Valve
Turn water back into the system:
- • Open the cold water inlet valve slowly
- • Water will start to fill the system
- • Air will continue to exit from the air vent
Close When Water Comes
Critical moment:
- • When water instead of air starts coming from the vent...
- • Close the valve immediately and tightly
- • Some water spilling is normal
Test and Control
Verify the process:
- • Open the hot water faucet
- • Check that flow is smooth and continuous
- • Verify that no noise is coming from the pipes
- • If there is still a problem, repeat the process
Alternative Method: Bleeding Air from Faucet
Use this method if there is no air vent or if it cannot be reached:
- 1 Open the hot water faucet at the highest point in the house
- 2 First air, then intermittent water, and finally smooth water will come
- 3 Keep the faucet open until the flow improves (1-2 minutes)
- 4 Repeat same process with other faucets
Preventing Air Entry
Provide continuous air discharge by installing an automatic vent at the highest point of the system.
Check all connection points for leaks once a year.
Use water regularly in summer months to prevent it from boiling.
Always bleed air after every maintenance operation.
Professional Support
If you cannot solve the problem or are experiencing other issues, you can get technical support via WhatsApp.
Get HelpFrequently Asked Questions
How do I know if there is air in the system?
Water flow becomes intermittent, clanking/gurgling noises come from the pipes, hot water temperature drops, and air comes before water from the faucet.
Why does the system produce air?
Air can enter the system during initial installation, after maintenance, water cuts, leaks, or overheating.
Where is the air vent located?
The air vent is usually located at the highest point of the tank or on the manifold. Some systems have an automatic air bleed valve.
How often should I bleed the air?
Under normal conditions, air bleeding is not necessary. It should only be done when symptoms are seen or after maintenance. If there is an automatic vent, the system will bleed itself.
