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: 57545
Heatrae Sadia Megaflo Eco Indirect Cylinder 145L
£1219.88 was £1293.87
ex. VAT £1016.57 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: 90455
Heatrae Sadia Megaflo Eco Direct Cylinder 125L
£949.00 was £1007.87
ex. VAT £790.83 Each
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Product code: 18313
Joule Invacyl Slimline Direct Unvented Cylinder 210L
£685.98
ex. VAT £571.65 Each
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Product code: 57431
Heatrae Sadia Megaflo Eco Indirect Cylinder 170L
£1520.69
ex. VAT £1267.24 Each
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Product code: 96498
Joule Invacyl Unvented Direct Cylinder 180L
£534.98
ex. VAT £445.82 Each
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Product code: 38630
Joule Invacyl Unvented Direct Cylinder 300L
£698.98
ex. VAT £582.48 Each
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Product code: 78838
Heatrae Sadia Megaflo Eco Direct Cylinder 210L
£1714.88
ex. VAT £1429.07 Each
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Product code: 35834
Heatrae Sadia Megaflo Eco Indirect Cylinder 210L
£1758.82
ex. VAT £1465.68 Each
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Product code: 55265
Joule Invacyl Slimline Indirect Unvented Cylinder 150L
£745.98
ex. VAT £621.65 Each
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Product code: 12489
Heatrae Sadia Megaflo Eco Direct Cylinder 170L
£1189.00 was £1272.07
ex. VAT £990.83 Each
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Product code: 88711
Heatrae Sadia Megaflo Eco Direct Cylinder 145L
£1089.73
ex. VAT £908.11 Each
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Product code: 24405
Heatrae Sadia Megaflo Eco Indirect Cylinder 125L
£1097.98 was £1119.94
ex. VAT £914.98 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: 93935
Joule Invacyl Unvented Direct Cylinder 150L
£529.98
ex. VAT £441.65 Each
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Product code: 89481
Joule Invacyl Unvented Indirect Cylinder 120L
£599.98
ex. VAT £499.98 Each
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