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 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.
Product code: 85192
Joule Invacyl Unvented Indirect Cylinder 180L
£626.98
ex. VAT £522.48 Each
Select from 5 options
Product code: 89200
4 Panel Cylinder Jacket 36 x 18"
£19.98
ex. VAT £16.65 Each
Select from 1 option
Product code: 67812
Heatrae Sadia Megaflo Eco Indirect Cylinder 250L
£1749.00 was £1979.52
ex. VAT £1457.50 Each
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Product code: 13300
Joule Invacyl Unvented Direct Cylinder 120L
£519.98
ex. VAT £433.32 Each
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Product code: 57767
Joule Invacyl Slimline Direct Unvented Cylinder 150L
£649.98
ex. VAT £541.65 Each
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Product code: 97382
4 Panel Cylinder Jacket 42 x 18"
£22.98
ex. VAT £19.15 Each
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Product code: 93426
Joule Invacyl Slimline Indirect Unvented Cylinder 180L
£759.98
ex. VAT £633.32 Each
Select from 4 options
Product code: 30686
Joule Invacyl Unvented Indirect Cylinder 250L
£699.98
ex. VAT £583.32 Each
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Product code: 66596
Joule Invacyl Slimline Indirect Unvented Cylinder 120L
£729.98
ex. VAT £608.32 Each
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Product code: 65632
Tesla Long Life Incoloy Immersion Heater & Resettable Thermostat 27"
£29.38
ex. VAT £24.48 Each
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Product code: 49984
Tesla Long Life Incoloy Immersion Heater & Resettable Thermostat 11"
£26.23
ex. VAT £21.86 Each
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Product code: 90334
Joule Invacyl Slimline Direct Unvented Cylinder 60L
£599.98
ex. VAT £499.98 Each
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Product code: 28579
Joule Invacyl Unvented Indirect Cylinder 150L
£606.98
ex. VAT £505.82 Each
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Product code: 41594
Joule Invacyl Slimline Direct Unvented Cylinder 90L
£619.98
ex. VAT £516.65 Each
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Product code: 77506
Joule Invacyl Unvented Indirect Cylinder 300L
£765.98
ex. VAT £638.32 Each
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Product code: 63781
Joule Invacyl Slimline Direct Unvented Cylinder 120L
£629.98
ex. VAT £524.98 Each
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Product code: 64909
Joule Invacyl Slimline Direct Unvented Cylinder 180L
£659.98
ex. VAT £549.98 Each
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Product code: 81978
Joule Invacyl Slimline Indirect Unvented Cylinder 210L
£765.98
ex. VAT £638.32 Each
Select from 4 options
Product code: 38630
Joule Invacyl Unvented Direct Cylinder 300L
£698.98
ex. VAT £582.48 Each
Select from 5 options
Product code: 51742
Joule Invacyl Unvented Indirect Cylinder 210L
£649.98
ex. VAT £541.65 Each
Select from 5 options
Product code: 54595
Heatrae Sadia Megaflo Eco Direct Cylinder 70L
£856.98
ex. VAT £714.15 Each
Select from 5 options
Product code: 78463
Heatrae Sadia Megaflo Eco Direct Cylinder 250L
£1520.00
ex. VAT £1266.67 Each
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Product code: 40149
Tesla Copper Immersion Heater & Resettable Thermostat 27"
£25.48
ex. VAT £21.23 Each
Select from 1 option
Product code: 12829
Tesla Copper Immersion Heater & Resettable Thermostat 11"
£20.98
ex. VAT £17.48 Each
Select from 1 option