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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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Water Storage Tank LWH: 442 x 296 x 305mm 4 Gallon
( 81 )

Product code: 38349

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

£11.49

ex. VAT £9.57Each

Byelaw 30 Tank Kit 4 Gallon
( 29 )

Product code: 37570

Byelaw 30 Tank Kit 4 Gallon

£27.99

ex. VAT £23.32Each

ZilmetZilmet / Zilmet Cal-Pro Heating Expansion Vessel 12L
( 78 )

Product code: 70204

Zilmet Cal-Pro Heating Expansion Vessel 12L

£34.99

ex. VAT £29.16Each

ZilmetZilmet / Zilmet Cal-Pro Heating Expansion Vessel 18L
( 78 )

Product code: 64278

Zilmet Cal-Pro Heating Expansion Vessel 18L

£36.29

ex. VAT £30.24Each

ZilmetZilmet / Zilmet Cal-Pro Heating Expansion Vessel 8L
( 29 )

Product code: 29704

Zilmet Cal-Pro Heating Expansion Vessel 8L

£30.69

ex. VAT £25.57Each

Storage Tank Lid 4 Gallon
( 48 )

Product code: 67700

Storage Tank Lid 4 Gallon

£4.75

ex. VAT £3.96Each

TeslaTesla / Tesla Long Life Incoloy Immersion Heater & Resettable Thermostat 27"
( 113 )

Product code: 65632

Tesla Long Life Incoloy Immersion Heater & Resettable Thermostat 27"

£31.49

ex. VAT £26.24Each

AristonAriston / Ariston Andris Expansion Vessel & Non-Return Valve KIT A
20%Off
( 15 )

Product code: 26919

Ariston Andris Expansion Vessel & Non-Return Valve KIT A

£45.59Was £56.99

ex. VAT £37.99Each

TeslaTesla / Tesla Copper Immersion Heater & Resettable Thermostat 27"
( 24 )

Product code: 40149

Tesla Copper Immersion Heater & Resettable Thermostat 27"

£26.99

ex. VAT £22.49Each

Water Tank Jacket 50 Gallon
( 92 )

Product code: 61470

Water Tank Jacket 50 Gallon

£23.49

ex. VAT £19.57Each

4 Panel Cylinder Jacket 36 x 18"
( 103 )

Product code: 89200

4 Panel Cylinder Jacket 36 x 18"

£21.89

ex. VAT £18.24Each

JouleJoule / Joule Invacyl Slimline Direct Unvented Cylinder 180L

Product code: 64909

Joule Invacyl Slimline Direct Unvented Cylinder 180L

£659.99

ex. VAT £549.99Each

TeslaTesla / Tesla Long Life Incoloy Immersion Heater & Resettable Thermostat 11"
( 60 )

Product code: 49984

Tesla Long Life Incoloy Immersion Heater & Resettable Thermostat 11"

£27.89

ex. VAT £23.24Each

TowerTower / Tower Shock Arrestor 1/2" BSP

Product code: AF056

Tower Shock Arrestor 1/2" BSP

£17.99

ex. VAT £14.99Each

JouleJoule / Joule Invacyl Slimline Indirect Unvented Cylinder 210L

Product code: 81978

Joule Invacyl Slimline Indirect Unvented Cylinder 210L

£765.99

ex. VAT £638.32Each

Water Tank Jacket 25 Gallon
( 25 )

Product code: 17512

Water Tank Jacket 25 Gallon

£14.79

ex. VAT £12.32Each

4 Panel Cylinder Jacket 42 x 18"
( 97 )

Product code: 97382

4 Panel Cylinder Jacket 42 x 18"

£25.79

ex. VAT £21.49Each

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

Product code: 93935

Joule Invacyl Unvented Direct Cylinder 150L

£529.99

ex. VAT £441.66Each

Expansion Vessel Control Kit
( 10 )

Product code: 49934

Expansion Vessel Control Kit

£57.69

ex. VAT £48.07Each

Byelaw 30 Kit
( 2 )

Product code: 40164

Byelaw 30 Kit

£11.49

ex. VAT £9.57Each

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

Product code: 85485

T-BAR Expansion Vessel Fixing Bar Kit

£45.89

ex. VAT £38.24Each

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

Product code: 79335

Joule Invacyl Unvented Direct Cylinder 210L

£559.99

ex. VAT £466.66Each

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

Product code: 12829

Tesla Copper Immersion Heater & Resettable Thermostat 11"

£21.49

ex. VAT £17.91Each

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

Product code: 98639

Heatrae Sadia Megaflo Eco Indirect Cylinder 300L

£1909.99Was £2122.14

ex. VAT £1591.66Each

ZilmetZilmet / Zilmet Cal-Pro Heating Expansion Vessel 24L
( 78 )

Product code: 72473

Zilmet Cal-Pro Heating Expansion Vessel 24L

£43.59

ex. VAT £36.32Each

JouleJoule / Joule Invacyl Unvented Indirect Cylinder 250L

Product code: 30686

Joule Invacyl Unvented Indirect Cylinder 250L

£699.99

ex. VAT £583.32Each

JouleJoule / Joule Invacyl Unvented Direct Cylinder 120L

Product code: 13300

Joule Invacyl Unvented Direct Cylinder 120L

£519.99

ex. VAT £433.32Each

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

Product code: 96498

Joule Invacyl Unvented Direct Cylinder 180L

£534.99

ex. VAT £445.82Each

Expansion Vessel Bracket 5 to 24L
( 7 )

Product code: 14121

Expansion Vessel Bracket 5 to 24L

£31.49

ex. VAT £26.24Each

JouleJoule / Joule Invacyl Unvented Indirect Cylinder 210L

Product code: 51742

Joule Invacyl Unvented Indirect Cylinder 210L

£649.99

ex. VAT £541.66Each

JouleJoule / Joule Invacyl Unvented Indirect Cylinder 180L

Product code: 85192

Joule Invacyl Unvented Indirect Cylinder 180L

£626.99

ex. VAT £522.49Each

JouleJoule / Joule Invacyl Unvented Indirect Cylinder 300L

Product code: 77506

Joule Invacyl Unvented Indirect Cylinder 300L

£765.99

ex. VAT £638.32Each

JouleJoule / Joule Invacyl Slimline Indirect Unvented Cylinder 150L

Product code: 55265

Joule Invacyl Slimline Indirect Unvented Cylinder 150L

£745.99

ex. VAT £621.66Each

Heatrae SadiaHeatrae Sadia / Heatrae Sadia Megaflo Eco Indirect Cylinder 170L

Product code: 57431

Heatrae Sadia Megaflo Eco Indirect Cylinder 170L

£1480.00

ex. VAT £1233.33Each

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

Product code: 67812

Heatrae Sadia Megaflo Eco Indirect Cylinder 250L

£1748.99

ex. VAT £1457.49Each

JouleJoule / Joule Invacyl Unvented Indirect Cylinder 150L

Product code: 28579

Joule Invacyl Unvented Indirect Cylinder 150L

£606.99

ex. VAT £505.82Each

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

Product code: 80867

Joule Invacyl Unvented Direct Cylinder 250L

£647.99

ex. VAT £539.99Each

JouleJoule / Joule Invacyl Slimline Direct Unvented Cylinder 60L

Product code: 90334

Joule Invacyl Slimline Direct Unvented Cylinder 60L

£599.99

ex. VAT £499.99Each

TeslaTesla / Tesla Expansion Vessel Service Valve

Product code: 48463

Tesla Expansion Vessel Service Valve

£15.99

ex. VAT £13.32Each

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

Product code: 90455

Heatrae Sadia Megaflo Eco Direct Cylinder 125L

£996.99

ex. VAT £830.82Each

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

Product code: 38630

Joule Invacyl Unvented Direct Cylinder 300L

£698.99

ex. VAT £582.49Each

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

Product code: 88711

Heatrae Sadia Megaflo Eco Direct Cylinder 145L

£1144.99

ex. VAT £954.16Each

Heatrae SadiaHeatrae Sadia / Heatrae Sadia Megaflo Eco Indirect Cylinder 210L

Product code: 35834

Heatrae Sadia Megaflo Eco Indirect Cylinder 210L

£1758.99

ex. VAT £1465.82Each

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

Product code: 78463

Heatrae Sadia Megaflo Eco Direct Cylinder 250L

£1519.99

ex. VAT £1266.66Each

JouleJoule / Joule Invacyl Slimline Direct Unvented Cylinder 120L

Product code: 63781

Joule Invacyl Slimline Direct Unvented Cylinder 120L

£629.99

ex. VAT £524.99Each

JouleJoule / Joule Invacyl Unvented Indirect Cylinder 120L

Product code: 89481

Joule Invacyl Unvented Indirect Cylinder 120L

£599.99

ex. VAT £499.99Each

JouleJoule / Joule Invacyl Slimline Direct Unvented Cylinder 210L

Product code: 18313

Joule Invacyl Slimline Direct Unvented Cylinder 210L

£685.99

ex. VAT £571.66Each

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

Product code: 57545

Heatrae Sadia Megaflo Eco Indirect Cylinder 145L

£1266.99Was £1293.87

ex. VAT £1055.82Each