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Hot Water Cylinders

Find hot water cylinders compatible with a range of central heating systems, including unvented, vented, direct and indirect hot water cylinders. At... 

Find hot water cylinders compatible with a range of central heating systems, including unvented, vented, direct and indirect hot water cylinders. At Toolstation, we stock hot water tanks from trusted brands like RM Cylinders and Tesla.

Types of Hot Water Cylinder

Several different hot water cylinders are available in various sizes and materials, including stainless steel and copper. Find the right option for your home based on your hot water usage and central heating system.

Unvented hot water cylinder: 

Connected to the mains water system for higher water pressure and better flow 
Cold water storage tank is not required.

Vented hot water cylinder:

Used for systems that rely on cold water storage.
Fed from a cold water tank in the loft, uses gravity pressure.

Direct hot water cylinders heat water using an internal element, like an immersion heater, whilst indirect hot water cylinders use an external source like a boiler. Indirect cylinders are available in vented and unvented models.

How do I know what size hot water cylinder I need?

  • 1–2 people: 120–150 L
  • 3–4 people: 180–210 L
  • 5+ people: 250 L+

Always size up if you have multiple bathrooms or high hot water demand.

Are unvented hot water cylinders safe?

Yes, when installed by a qualified G3‑certified engineer. They include safety valves and expansion vessels to handle pressure safely.

How can I make my hot water cylinder more efficient?

Fit a well‑insulated jacket (for vented cylinders), set the thermostat to around 60 °C, and service it regularly. For immersion heaters, use a timer to heat only when needed.

Shop our full range of hot water cylinders and accessories here.

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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 27"
( 113 )

Product code: 65632

Tesla Long Life Incoloy Immersion Heater & Resettable Thermostat 27"

£31.49

ex. VAT £26.24Each

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

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

Product code: 93935

Joule Invacyl Unvented Direct Cylinder 150L

£529.99

ex. VAT £441.66Each

JouleJoule / Joule Invacyl Slimline Indirect Unvented Cylinder 210L

Product code: 81978

Joule Invacyl Slimline Indirect Unvented Cylinder 210L

£765.99

ex. VAT £638.32Each

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 Slimline Indirect Unvented Cylinder 150L

Product code: 55265

Joule Invacyl Slimline Indirect Unvented Cylinder 150L

£745.99

ex. VAT £621.66Each

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

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 Unvented Indirect Cylinder 300L

Product code: 77506

Joule Invacyl Unvented Indirect Cylinder 300L

£765.99

ex. VAT £638.32Each

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

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

Product code: 96498

Joule Invacyl Unvented Direct Cylinder 180L

£534.99

ex. VAT £445.82Each

JouleJoule / Joule Invacyl Unvented Indirect Cylinder 210L

Product code: 51742

Joule Invacyl Unvented Indirect Cylinder 210L

£649.99

ex. VAT £541.66Each

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

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

Product code: 79335

Joule Invacyl Unvented Direct Cylinder 210L

£559.99

ex. VAT £466.66Each

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 Unvented Indirect Cylinder 250L

Product code: 30686

Joule Invacyl Unvented Indirect Cylinder 250L

£699.99

ex. VAT £583.32Each

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

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 Slimline Direct Unvented Cylinder 60L

Product code: 90334

Joule Invacyl Slimline Direct Unvented Cylinder 60L

£599.99

ex. VAT £499.99Each

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

Product code: 38630

Joule Invacyl Unvented Direct Cylinder 300L

£698.99

ex. VAT £582.49Each

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 120L

Product code: 13300

Joule Invacyl Unvented Direct Cylinder 120L

£519.99

ex. VAT £433.32Each

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 Direct Cylinder 125L

Product code: 90455

Heatrae Sadia Megaflo Eco Direct Cylinder 125L

£996.99

ex. VAT £830.82Each

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

JouleJoule / Joule Invacyl Unvented Indirect Cylinder 120L

Product code: 89481

Joule Invacyl Unvented Indirect Cylinder 120L

£599.99

ex. VAT £499.99Each

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

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 Indirect Cylinder 145L
Save£26

Product code: 57545

Heatrae Sadia Megaflo Eco Indirect Cylinder 145L

£1266.99Was £1293.87

ex. VAT £1055.82Each

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

Product code: 24405

Heatrae Sadia Megaflo Eco Indirect Cylinder 125L

£1154.99

ex. VAT £962.49Each

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

Product code: 12489

Heatrae Sadia Megaflo Eco Direct Cylinder 170L

£1248.99

ex. VAT £1040.82Each

JouleJoule / Joule Invacyl Slimline Indirect Unvented Cylinder 180L

Product code: 93426

Joule Invacyl Slimline Indirect Unvented Cylinder 180L

£759.99

ex. VAT £633.32Each

JouleJoule / Joule Invacyl Slimline Direct Unvented Cylinder 210L

Product code: 18313

Joule Invacyl Slimline Direct Unvented Cylinder 210L

£685.99

ex. VAT £571.66Each

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 Slimline Direct Unvented Cylinder 90L

Product code: 41594

Joule Invacyl Slimline Direct Unvented Cylinder 90L

£619.99

ex. VAT £516.66Each

JouleJoule / Joule Invacyl Slimline Indirect Unvented Cylinder 90L

Product code: 73635

Joule Invacyl Slimline Indirect Unvented Cylinder 90L

£709.99

ex. VAT £591.66Each

JouleJoule / Joule Invacyl Slimline Indirect Unvented Cylinder 120L

Product code: 66596

Joule Invacyl Slimline Indirect Unvented Cylinder 120L

£729.99

ex. VAT £608.32Each

JouleJoule / Joule Invacyl Slimline Direct Unvented Cylinder 150L

Product code: 57767

Joule Invacyl Slimline Direct Unvented Cylinder 150L

£649.99

ex. VAT £541.66Each