1. Central Heating Supplies
  2. Tanks & Vessels

Expansion Tanks & Vessels

At Toolstation, we stock a wide range of feed and expansion tanks from trusted brands like RM Cylinders, Tesla, Polytank and Ariston. Whether you need a 5L expansion tank, 25L hot water storage tank, immersion heater, thermostat, ball valve or tank jacket, we’ve got plenty of products to choose from.

What is a Central Heating Expansion Tank Used For?

Central heating tanks are an essential component for most domestic systems, helping to maintain the correct pressure throughout the system. Expansion vessels work similarly to an overflow tank, allowing excess water or air to be stored as the system heats and cools. All boilers are already fitted with an expansion tank, but they may need replacing if you frequently experience pressure loss, leaving you without heating or hot water. Browse our full selection of central heating expansion tanks here and find high-quality replacement parts.
Unbranded / Water Storage Tank LWH: 442 x 296 x 305mm 4 Gallon
( 76 )

£10.49

ex. VAT £8.74 Each

Unbranded / Storage Tank Lid 4 Gallon
( 46 )

Product code: 67700

Storage Tank Lid 4 Gallon

£4.29

ex. VAT £3.57 Each

Unbranded / Byelaw 30 Tank Kit 4 Gallon
( 28 )

Product code: 37570

Byelaw 30 Tank Kit 4 Gallon

£25.49

ex. VAT £21.24 Each

Ariston Ariston / Ariston Andris Expansion Vessel & Non-Return Valve KIT A
10% Off
( 13 )

£49.49 was £54.99

ex. VAT £41.24 Each

Zilmet Zilmet / Expansion Vessel 18L
( 75 )

Product code: 64278

Expansion Vessel 18L

£40.29

ex. VAT £33.57 Each

Zilmet Zilmet / Expansion Vessel 12L
( 75 )

Product code: 70204

Expansion Vessel 12L

£38.99

ex. VAT £32.49 Each

Unbranded / Ball Valve Pack
( 147 )

Product code: 18984

Ball Valve Pack

£15.89

ex. VAT £13.24 Each

Zilmet Zilmet / Expansion Vessel 8L
( 29 )

Product code: 29704

Expansion Vessel 8L

£30.79

ex. VAT £25.66 Each

Expansion Vessel Control Kit
( 9 )

Product code: 49934

Expansion Vessel Control Kit

£57.89

ex. VAT £48.24 Each

Zilmet Zilmet / Expansion Vessel 25L
( 75 )

Product code: 72473

Expansion Vessel 25L

£43.69 was £44.26

ex. VAT £36.41 Each

4 Panel Cylinder Jacket 42 x 18"
( 96 )

£23.49

ex. VAT £19.57 Each

Joule Joule / Joule Invacyl Unvented Direct Cylinder 300L
( 1 )

£698.99

ex. VAT £582.49 Each

Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Indirect Cylinder 300L
Save £212

£1909.99 was £2122.14

ex. VAT £1591.66 Each

Joule Joule / Joule Invacyl Slimline Indirect Unvented Cylinder 180L

£759.99

ex. VAT £633.32 Each

Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Direct Cylinder 125L

£948.99

ex. VAT £790.82 Each

Tower Tower / Tower Shock Arrestor 1/2" BSP

£17.99

ex. VAT £14.99 Each

4 Panel Cylinder Jacket 36 x 18"
( 103 )

£19.99

ex. VAT £16.66 Each

Joule Joule / Joule Invacyl Slimline Direct Unvented Cylinder 120L

£629.99

ex. VAT £524.99 Each

Joule Joule / Joule Invacyl Unvented Direct Cylinder 120L

£519.99

ex. VAT £433.32 Each

Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Indirect Cylinder 250L

£1748.99

ex. VAT £1457.49 Each

Tesla Tesla / Tesla Copper Immersion Heater & Resettable Thermostat 11"
( 14 )

£21.99

ex. VAT £18.32 Each

Joule Joule / Joule Invacyl Unvented Direct Cylinder 210L
( 1 )

£559.99

ex. VAT £466.66 Each

Joule Joule / Joule Invacyl Unvented Indirect Cylinder 300L

£765.99

ex. VAT £638.32 Each

Joule Joule / Joule Invacyl Unvented Indirect Cylinder 250L

£699.99

ex. VAT £583.32 Each