Heating Expansion Vessels

Overview

GMS Expansion Vessel

Expansion vessels are commonly used to protect closed water heating systems and domestic hot water heating systems from being exposed to high pressure. Expansion vessels work by being part filled with air, this then protects the system by cushioning any shock which is caused by water hammer and also absorbing any excessive water pressure which may have been caused by thermal expansion.

Modern expansion vessels are split, air is contained next to the steel interior wall of the vessel and the centre of the vessel contains a butyl membrane which holds water which is pushed from the water system when the pressure within that system becomes too high. The butyl membrane used within an expansion vessel can be suitable for potable domestic hot water systems and meet drinking water regulations. When the heating system is empty the butyl membrane is pushed against the water inlet which is connected to the heating system and supplies the hot water, as the water increases within the water heating system, water is pushed into the expansion vessel and the butyl membrane fills, this then expands and compresses the air that is contained within the vessel.

Specification

Shell Material: Carbon Steel

Maximum Working Pressure: As stated in table

Maximum Operating Temperature: 120°C

GMS Heating Expansion Vessels are CE marked.

Prices

Please note all prices are in Pounds Sterling, exclude VAT and are subject to change. Dimensions and connection sizes may differ slighlty due to stock levels. Please confirm sizes at time of order with our sales department.

Capacity (Litres)

Diameter (mm)

Overall Height (mm)

Connection

Max Pressure (Bar)

Price

8

272

235

3/4”

3.00

£19.00

12

272

315

3/4”

3.00

£24.00

18

308

365

3/4”

3.00

£26.00

25

308

485

3/4”

3.00

£27.00

35

376

465

3/4”

3.00

£50.00

50

441

495

3/4”

6.00

£55.00

80

512

570

1”

6.00

£125.00

100

512

680

1”

6.00

£140.00

140

512

895

1”

6.00

£150.00

200

634

760

1”

6.00

£180.00

250

634

890

1”

6.00

£270.00

300

634

1090

1”

6.00

£285.00

400

740

1090

1”

6.00

£350.00

500

740

1290

1”

6.00

£470.00

600

740

1530

1”

6.00

£570.00

800

740

1995

1”

6.00

£660.00

 

Please also note GMS have a minimum order value of £100.00.

Information Pages

     Overview

Options Available

     Heating Expansion Vessel

     Potable Water Expansion Vessel 

     Complete Spares Brochure 

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