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Expansion Vessel
Expansion Vessel

Expansion Vessel

With many looking to reduce their carbon footprint and energy bills, solar systems are an increasingly popular choice. One key component that helps a solar thermal heating system function efficiently is the expansion vessel. At BES, we offer a range of high-quality expansion vessels to suit different system requirements.  

With great prices, fast shipping and free returns, shop for expansion vessels confidently with BES. 

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Helping you find the right expansion vessel for your solar thermal system 

An expansion vessel works by providing a cushion of air that absorbs the excess pressure caused by the expansion of water in the system. When the water expands, it enters the expansion vessel, compressing the air inside it. This compression of air allows the expansion vessel to absorb the pressure caused by the expansion of water, thus protecting the system from damage. 

Available in 12, 18, 24, 35 and 50 litre sizes, we offer a wide range of expansion vessels made from durable materials and specifically designed for solar thermal heating systems. Our range of solar thermal expansion vessels includes the following: 

Solar Expansion Vessels 

Solar expansion vessels from top manufacturers such as Solar-Plus and Eres are available in this range. With all available solar expansion vessels designed for solar heating systems, they come in a variety of sizes to suit different system requirements and have a maximum working temperature of 130°C.  

Solar Expansion Vessels Connection Kits 

BES stocks a wide range of connection kits for solar expansion vessels. Our most popular connection kit can be used with 12, 18 and 24 litre vessels.   

Recovery Containers 

Essential in storing expelled solar glycol fluid, the most popular recovery container we have here at BES is the Safe Valve Solar Fluid Recovery Container, which comes with a drain valve. 

A selection of solar thermal system products like no other 

Shopping for renewable solar thermal products is easy and straightforward when you shop online at BES. 

Our solar thermal system parts range includes controls, circulator pumps, valves, system fluid, pipe & fittings, pump stations, fill & test, pipe insulation, consumables, air vent and cylinders 

You can also view our entire range of renewable heating & ventilation products here. 

Unrivalled experience & top-rated customer reviews 

Experience is everything to us; our customer experience reflects this. With an excellent rating from thousands of reviews on Reviews.co.uk, we take pride here at BES in helping customers nationwide source expansion vessels for solar systems.  

And with over 15,000 products in stock and free delivery on qualifying orders, choosing to shop with us is easy.   

Helping you get the solar thermal expansion vessel you need 

At BES, we want your solar thermal system to stay protected and work at its best, so we aim to deliver your expansion vessel as quickly as possible, with next-day delivery available on thousands of products. 

Need a solar expansion vessel for a specific solar thermal heating system, but have trouble finding it? There’s a good chance BES can help – call us on 0800 801090; we’ll gladly help you source it or offer a suitable alternative. 

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