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 Tank Jacket 25 Gallon
( 20 )

Product code: 17512

Water Tank Jacket 25 Gallon

£13.18

ex. VAT £10.98 Each

Product options Select from 1 option
Joule Joule / Joule Invacyl Unvented Indirect Cylinder 250L

£699.98

ex. VAT £583.32 Each

Product options Select from 5 options
Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Direct Cylinder 70L

£856.98

ex. VAT £714.15 Each

Product options Select from 5 options
Expansion Vessel Bracket 5 to 24L
( 7 )

£30.67

ex. VAT £25.56 Each

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

£20.98

ex. VAT £17.48 Each

Product options Select from 1 option
Tesla Tesla / T-BAR Expansion Vessel Fixing Bar Kit
( 4 )

£44.98

ex. VAT £37.48 Each

Joule Joule / Joule Invacyl Slimline Indirect Unvented Cylinder 210L

£765.98

ex. VAT £638.32 Each

Product options Select from 4 options
Joule Joule / Joule Invacyl Slimline Direct Unvented Cylinder 180L

£659.98

ex. VAT £549.98 Each

Product options Select from 5 options
Joule Joule / Joule Invacyl Unvented Direct Cylinder 120L

£519.98

ex. VAT £433.32 Each

Product options Select from 5 options
RM Cylinders RM Cylinders / RM Optimum Stainless Steel Indirect Unvented Hot Water Cylinder 1470 x 545 210L

£769.98

ex. VAT £641.65 Each

Product options Select from 5 options
Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Indirect Cylinder 145L
Save £73

£1219.88 was £1293.87

ex. VAT £1016.57 Each

Product options Select from 5 options
Joule Joule / Joule Invacyl Slimline Direct Unvented Cylinder 90L

£619.98

ex. VAT £516.65 Each

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Joule Joule / Joule Invacyl Unvented Indirect Cylinder 210L

£649.98

ex. VAT £541.65 Each

Product options Select from 5 options
Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Indirect Cylinder 170L

£1520.69

ex. VAT £1267.24 Each

Product options Select from 5 options
Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Direct Cylinder 125L
Save £58

£949.00 was £1007.87

ex. VAT £790.83 Each

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Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Indirect Cylinder 125L
Save £21

£1097.98 was £1119.94

ex. VAT £914.98 Each

Product options Select from 5 options
Joule Joule / Joule Invacyl Unvented Indirect Cylinder 300L

£765.98

ex. VAT £638.32 Each

Product options Select from 5 options
Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Indirect Cylinder 210L

£1758.82

ex. VAT £1465.68 Each

Product options Select from 5 options
Heatrae Sadia Heatrae Sadia / Heatrae Sadia Megaflo Eco Direct Cylinder 145L

£1089.73

ex. VAT £908.11 Each

Product options Select from 5 options
Joule Joule / Joule Invacyl Unvented Indirect Cylinder 150L

£606.98

ex. VAT £505.82 Each

Product options Select from 5 options
Joule Joule / Joule Invacyl Slimline Indirect Unvented Cylinder 90L

£709.98

ex. VAT £591.65 Each

Product options Select from 4 options
Joule Joule / Joule Invacyl Slimline Direct Unvented Cylinder 120L

£629.98

ex. VAT £524.98 Each

Product options Select from 5 options
Joule Joule / Joule Invacyl Slimline Indirect Unvented Cylinder 150L

£745.98

ex. VAT £621.65 Each

Product options Select from 4 options
RM Cylinders RM Cylinders / RM Optimum Stainless Steel Indirect Unvented Hot Water Cylinder 1980 x 545 300L

£814.98

ex. VAT £679.15 Each

Product options Select from 5 options