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  2. Central Heating Supplies
  3. 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...
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.
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Unbranded / Water Storage Tank LWH: 442 x 296 x 305mm 4 Gallon
( 79 )

Product code: 38349

Water Storage Tank LWH: 442 x 296 x 305mm 4 Gallon

£11.49

ex. VAT £9.57 Each

Unbranded / Ball Valve Pack
( 153 )

Product code: 18984

Ball Valve Pack

£17.49

ex. VAT £14.57 Each

Unbranded / Storage Tank Lid 4 Gallon
( 47 )

Product code: 67700

Storage Tank Lid 4 Gallon

£4.75

ex. VAT £3.96 Each

Ariston Ariston / Ariston Andris Expansion Vessel & Non-Return Valve KIT A
( 14 )

Product code: 26919

Ariston Andris Expansion Vessel & Non-Return Valve KIT A

£56.99

ex. VAT £47.49 Each

Unbranded / Byelaw 30 Tank Kit 4 Gallon
( 28 )

Product code: 37570

Byelaw 30 Tank Kit 4 Gallon

£27.99

ex. VAT £23.32 Each

Tesla Tesla / Tesla Long Life Incoloy Immersion Heater & Resettable Thermostat 11"
( 59 )

Product code: 49984

Tesla Long Life Incoloy Immersion Heater & Resettable Thermostat 11"

£27.89

ex. VAT £23.24 Each

Zilmet Zilmet / Expansion Vessel 8L
( 29 )

Product code: 29704

Expansion Vessel 8L

£30.69

ex. VAT £25.57 Each

Zilmet Zilmet / Expansion Vessel 18L
( 76 )

Product code: 64278

Expansion Vessel 18L

£36.29

ex. VAT £30.24 Each

Tesla Tesla / Tesla Long Life Incoloy Immersion Heater & Resettable Thermostat 27"
( 112 )

Product code: 65632

Tesla Long Life Incoloy Immersion Heater & Resettable Thermostat 27"

£31.49

ex. VAT £26.24 Each

Zilmet Zilmet / Expansion Vessel 12L
( 76 )

Product code: 70204

Expansion Vessel 12L

£34.99

ex. VAT £29.16 Each

Tower Tower / Tower Shock Arrestor 1/2" BSP

Product code: AF056

Tower Shock Arrestor 1/2" BSP

£17.99

ex. VAT £14.99 Each

Tesla Tesla / Tesla Copper Immersion Heater & Resettable Thermostat 27"
( 23 )

Product code: 40149

Tesla Copper Immersion Heater & Resettable Thermostat 27"

£26.99

ex. VAT £22.49 Each

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

Product code: 38630

Joule Invacyl Unvented Direct Cylinder 300L

£698.99

ex. VAT £582.49 Each

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

Product code: 79335

Joule Invacyl Unvented Direct Cylinder 210L

£559.99

ex. VAT £466.66 Each

Joule Joule / Joule Invacyl Unvented Indirect Cylinder 250L

Product code: 30686

Joule Invacyl Unvented Indirect Cylinder 250L

£699.99

ex. VAT £583.32 Each

Joule Joule / Joule Invacyl Slimline Indirect Unvented Cylinder 180L

Product code: 93426

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

Product code: 90455

Heatrae Sadia Megaflo Eco Direct Cylinder 125L

£996.99

ex. VAT £830.82 Each

Unbranded / Water Tank Jacket 50 Gallon
( 92 )

Product code: 61470

Water Tank Jacket 50 Gallon

£23.49

ex. VAT £19.57 Each

Tesla Tesla / T-BAR Expansion Vessel Fixing Bar Kit
( 4 )

Product code: 85485

T-BAR Expansion Vessel Fixing Bar Kit

£45.89

ex. VAT £38.24 Each

Joule Joule / Joule Invacyl Slimline Direct Unvented Cylinder 120L

Product code: 63781

Joule Invacyl Slimline Direct Unvented Cylinder 120L

£629.99

ex. VAT £524.99 Each

Joule Joule / Joule Invacyl Slimline Direct Unvented Cylinder 180L

Product code: 64909

Joule Invacyl Slimline Direct Unvented Cylinder 180L

£659.99

ex. VAT £549.99 Each

Zilmet Zilmet / Expansion Vessel 25L
( 76 )

Product code: 72473

Expansion Vessel 25L

£43.59 was £44.26

ex. VAT £36.32 Each

Unbranded / Byelaw 30 Kit
( 2 )

Product code: 40164

Byelaw 30 Kit

£11.49

ex. VAT £9.57 Each

Joule Joule / Joule Invacyl Unvented Direct Cylinder 120L

Product code: 13300

Joule Invacyl Unvented Direct Cylinder 120L

£519.99

ex. VAT £433.32 Each

Joule Joule / Joule Invacyl Slimline Direct Unvented Cylinder 90L

Product code: 41594

Joule Invacyl Slimline Direct Unvented Cylinder 90L

£619.99

ex. VAT £516.66 Each

Expansion Vessel Control Kit
( 10 )

Product code: 49934

Expansion Vessel Control Kit

£57.69

ex. VAT £48.07 Each

Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Direct Cylinder 145L

Product code: 88711

Heatrae Sadia Megaflo Eco Direct Cylinder 145L

£1144.99

ex. VAT £954.16 Each

Expansion Vessel Bracket 5 to 24L
( 7 )

Product code: 14121

Expansion Vessel Bracket 5 to 24L

£31.49

ex. VAT £26.24 Each

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

Product code: 12829

Tesla Copper Immersion Heater & Resettable Thermostat 11"

£21.49

ex. VAT £17.91 Each

Joule Joule / Joule Invacyl Unvented Direct Cylinder 150L
( 1 )

Product code: 93935

Joule Invacyl Unvented Direct Cylinder 150L

£529.99

ex. VAT £441.66 Each

4 Panel Cylinder Jacket 42 x 18"
( 96 )

Product code: 97382

4 Panel Cylinder Jacket 42 x 18"

£25.79

ex. VAT £21.49 Each

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

Product code: 78463

Heatrae Sadia Megaflo Eco Direct Cylinder 250L

£1519.99

ex. VAT £1266.66 Each

Joule Joule / Joule Invacyl Unvented Direct Cylinder 180L
( 1 )

Product code: 96498

Joule Invacyl Unvented Direct Cylinder 180L

£534.99

ex. VAT £445.82 Each

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

Product code: 98639

Heatrae Sadia Megaflo Eco Indirect Cylinder 300L

£1909.99 was £2122.14

ex. VAT £1591.66 Each

4 Panel Cylinder Jacket 36 x 18"
( 103 )

Product code: 89200

4 Panel Cylinder Jacket 36 x 18"

£21.89

ex. VAT £18.24 Each

Joule Joule / Joule Invacyl Slimline Direct Unvented Cylinder 60L

Product code: 90334

Joule Invacyl Slimline Direct Unvented Cylinder 60L

£599.99

ex. VAT £499.99 Each

Joule Joule / Joule Invacyl Unvented Indirect Cylinder 300L

Product code: 77506

Joule Invacyl Unvented Indirect Cylinder 300L

£765.99

ex. VAT £638.32 Each

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

Product code: 67812

Heatrae Sadia Megaflo Eco Indirect Cylinder 250L

£1748.99

ex. VAT £1457.49 Each

Joule Joule / Joule Invacyl Unvented Indirect Cylinder 180L

Product code: 85192

Joule Invacyl Unvented Indirect Cylinder 180L

£626.99

ex. VAT £522.49 Each

Tesla Tesla / Tesla Expansion Vessel Service Valve

Product code: 48463

Tesla Expansion Vessel Service Valve

£15.99

ex. VAT £13.32 Each

Joule Joule / Joule Invacyl Unvented Direct Cylinder 250L
( 1 )

Product code: 80867

Joule Invacyl Unvented Direct Cylinder 250L

£647.99

ex. VAT £539.99 Each

Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Direct Cylinder 70L

Product code: 54595

Heatrae Sadia Megaflo Eco Direct Cylinder 70L

£856.99

ex. VAT £714.16 Each

Joule Joule / Joule Invacyl Unvented Indirect Cylinder 150L

Product code: 28579

Joule Invacyl Unvented Indirect Cylinder 150L

£606.99

ex. VAT £505.82 Each

Joule Joule / Joule Invacyl Slimline Direct Unvented Cylinder 210L

Product code: 18313

Joule Invacyl Slimline Direct Unvented Cylinder 210L

£685.99

ex. VAT £571.66 Each

Joule Joule / Joule Invacyl Slimline Indirect Unvented Cylinder 210L

Product code: 81978

Joule Invacyl Slimline Indirect Unvented Cylinder 210L

£765.99

ex. VAT £638.32 Each

Joule Joule / Joule Invacyl Slimline Indirect Unvented Cylinder 150L

Product code: 55265

Joule Invacyl Slimline Indirect Unvented Cylinder 150L

£745.99

ex. VAT £621.66 Each

Joule Joule / Joule Invacyl Slimline Direct Unvented Cylinder 150L

Product code: 57767

Joule Invacyl Slimline Direct Unvented Cylinder 150L

£649.99

ex. VAT £541.66 Each

Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Indirect Cylinder 145L
Save £26

Product code: 57545

Heatrae Sadia Megaflo Eco Indirect Cylinder 145L

£1266.99 was £1293.87

ex. VAT £1055.82 Each