8 Litre Expansion Vessel – Safety for Unvented Hot Water Systems

8 Litre Expansion Vessel – Safety for Unvented Hot Water Systems

The 8 Litre Expansion Vessel is an essential safety component for any unvented hot water system. Designed for compatibility with TESY Hot Water Cylinders ranging from 30 to 150 litres, this expansion vessel ensures your installation remains safe, efficient, and compliant with UK regulations. Its robust capacity and compact footprint make it suitable for a wide range of domestic and light commercial applications.

Why Choose the 8 Litre Expansion Vessel?

The 8 Litre Expansion Vessel is engineered to absorb excess pressure caused by water expansion during the heating cycle. By maintaining stable system pressure, it protects your pipework, appliances, and fittings from unnecessary stress and potential leaks. This vessel is a recommended addition for all unvented hot water installations, particularly when using TESY cylinders.

Key Features

Robust Capacity: 8 litre volume, ideal for hot water systems with 30–150 litre cylinders.
Compact Design: At just 345 mm in length and 190 mm in width, it fits easily into most airing cupboards or plant rooms.
Easy Connection: 22 mm thread diameter for straightforward installation with standard pipework.
Quality Construction: Manufactured to meet stringent UK safety standards for unvented systems.
Flexible Mounting: No wall bracket required for most installations, keeping fitting simple and tidy.

Installation & Compliance

Proper installation of an 8 Litre Expansion Vessel is required under UK Building Regulations G3 for any unvented hot water system. For best results, pair this vessel with a TESY hot water cylinder and a pressure relief valve to ensure full compliance and system safety. For installation accessories, browse our heating accessories.

Delivery & Support

Enjoy free delivery to UK mainland addresses on all orders over £100. For non-mainland UK delivery or trade enquiries, please contact us before purchasing.

Additional Information 

FREE Delivery: Available on orders over £100. Next working day delivery is available for orders placed before 2 pm. Please click here to check delivery to your area.

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Need Assistance? Contact us for expert advice on 0161 439 1400.

Looking for reliable hot water cylinders, electric heating solutions, or technical support? Visit tesy.com for full product information, technical documentation, and expert advice.