Bottle Air Vents
Automatic bottle air vents remove trapped air from sealed central heating and plumbing systems, supporting efficient circulation and reducing common issues such as noise, airlocks and uneven heat distribution. At BES, we stock a practical range of automatic bottle air vents for heating and plumbing installations, including 1/2", 3/8" and 15mm compression options.
With next working day delivery, 30-day returns, and thousands of positive reviews, finding the right bottle air vent couldn’t be easier.
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A Dependable Selection Of Automatic Bottle Air Vents
Our selection includes bottle air vents with check valves, plus trusted options from Caleffi and Reliance.
Automatic Air Bottle Vents With Check Valves
Bottle air vents with check valves are designed to allow the automatic release of air while making servicing or replacement more straightforward. The check valve can help isolate the vent when it is removed, reducing the need to drain down more of the system, depending on the installation. At BES, we stock 1/2" and 3/8" automatic air bottle vents with check valves, giving installers options for different system layouts, connection points and component requirements.
Automatic Air Bottle Vents
The Caleffi Robocal automatic air bottle vent automatically removes air from suitable heating and plumbing systems. As with any air vent, the correct product should be chosen according to the system type, connection size, pressure, temperature and installation position.
15mm Compression Air Vents
15mm compression air vents are useful when the vent needs to connect directly to compatible 15mm pipework. They are often chosen for practical installation on heating pipework where a threaded connection is not already available. Our selection includes a standard 15mm compression air vent and a Reliance automatic air bottle vent in 15mm, helping installers choose the connection style that best suits the job.
How Automatic Bottle Air Vents Work
Automatic bottle air vents typically use an internal float mechanism. When air collects inside the vent body, the float drops, opening the vent and allowing trapped air to escape. As water enters the chamber, the float rises again, sealing the vent to help prevent water from escaping. This automatic process helps remove air from the system during operation, commissioning or refilling. The vent must be installed in the correct position, usually upright and at a suitable high point where air is likely to collect.
Where Are Bottle Air Vents Installed?
Automatic bottle air vents are commonly installed at high points in heating and plumbing systems, where trapped air naturally collects. This may include pipework runs, boiler circuits, manifolds, cylinders, or other suitable venting points, depending on the system design. They should normally be installed vertically to ensure the float mechanism operates correctly. The system should be depressurised before fitting, and the air vent should be installed by a competent person in line with the system design and the manufacturer's guidance.
How To Choose The Right Bottle Air Vent
When choosing an automatic bottle air vent, check the connection size first. BES stocks common options, including 1/2", 3/8" and 15mm compression, so it is important to match the vent to the pipework, fitting or system component it will connect to. You should also consider whether a check valve is required. A bottle air vent with a check valve can make future maintenance easier, as it may allow the vent to be removed with less disruption to the system.
Why Choose BES?
BES has supplied the trade for over five decades, offering a wide range of plumbing, heating, brassware and installation products for professional and domestic customers. Our bottle air vent range helps installers source common sizes and trusted brands from one trade-focused supplier.
With fast delivery options, free UK mainland delivery on qualifying orders over £50, Click & Collect and straightforward online ordering, BES helps you get the parts you need quickly.
Order Air Bottle Vents Online
View our selection of Caleffi Robocal vents, Reliance compression vents, and standard threaded air bottles below to keep your central heating systems running silently and efficiently. For support or help sourcing a particular product, contact our team on 0800 80 10 90.
FAQs
How does an automatic bottle air vent work?
An automatic bottle air vent uses an internal float mechanism. When air enters the vent body, the float drops, opening the vent so air can escape. When water fills the chamber, the float rises, closing the vent.
Where should an automatic bottle air vent be installed?
Automatic bottle air vents are usually installed at high points in a heating or plumbing system, where trapped air is likely to accumulate. They should normally be fitted upright so the internal float can operate correctly.
What sizes of automatic air bottle vents does BES stock?
BES stocks automatic bottle air vents in common sizes, including 1/2", 3/8" and 15mm compression, with options from brands such as Caleffi and Reliance.
What does the check valve do on a bottle air vent?
A check valve can help isolate the air vent when it is removed, which may make maintenance or replacement easier and reduce the need to drain down more of the system. Suitability depends on the installation and product type.
Why is my automatic air vent leaking water?
An automatic air vent may leak if dirt or debris affects the float mechanism, the seal is worn, system pressure is too high, or the vent has been installed incorrectly. The system should be inspected by a competent person before the vent is cleaned, repaired or replaced.
Can you clean or replace a clogged automatic air vent?
In some cases, an automatic air vent can be cleaned or replaced if debris is preventing it from sealing properly. The system should be isolated and depressurised before work begins.
What is the difference between a manual radiator vent and an automatic bottle vent?
A manual radiator vent is opened by hand, usually with a radiator key, to release trapped air from a radiator. An automatic bottle air vent is designed to release trapped air automatically from suitable points in a heating or plumbing system.