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Unvented Mains Pressure Cylinders

Known for superb longevity and durability, stainless steel is the material of choice for modern hot water cylinders. We list unvented hot water cylinders from all the big brands including Warmflow, Telford, Joule, Ariston and Heatrae Sadia.

The most common type of unvented cylinder is indirectly heated by a boiler, with direct models heated by immersions. Solar models have the addition of a solar coil. Often commonly called a Megaflo, most unvented stainless steel cylinders contain the same parts as the Heatrae Sadia model, but are available at a far better price. We advise customers not to pay over the odds for their hot water cylinder!

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1 - 36 Of 166 Products
Ariston ST100 Wall Hung Unvented Enamel Steel Cylinder, Direct, 100 Litres
SAVE 52%
£355.95 RRP £747.60
Ariston Classico STD125HE-2 Unvented Glass Lined Steel Cylinder, Direct, 125 Litres
SAVE 52%
£376.95 RRP £790.80
Ariston Classico STD150HE-2 Unvented Glass Lined Steel Cylinder Direct 150 Litres
SAVE 52%
£390.95 RRP £820.80
Ariston Classico STD210HE-2 Unvented Glass Lined Steel Cylinder, Direct, 210 Litres
SAVE 52%
£412.95 RRP £866.40
Warmflow DIRECT Unvented Stainless Steel Hot Water Cylinder 90 LITRE
SAVE 29%
£413.95 RRP £583.20
Ariston Aquabravo ITD130 Unvented Stainless Steel Cylinder, Direct, 130 Litres
SAVE 52%
£418.95 RRP £880.80
Ariston Aquabravo ITD150 Unvented Stainless Steel Cylinder, Direct, 150 Litres
SAVE 52%
£436.95 RRP £918.00
Warmflow DIRECT Unvented Stainless Steel Hot Water Cylinder 120 LITRE
SAVE 31%
£454.95 RRP £657.60
Joule Cyclone Standard Direct Unvented Cylinder, 90 Litre, Stainless Steel
SAVE 21%
£459.95 RRP £582.71
Joule Cyclone Standard Direct Unvented Cylinder, 125 Litre, Stainless Steel
SAVE 21%
£464.95 RRP £589.68
Ariston Classico STI125HE-2 Unvented Glass Lined Steel Cylinder, Indirect, 125 Litres
SAVE 52%
£473.95 RRP £994.80
Warmflow DIRECT Unvented Stainless Steel Hot Water Cylinder 150 LITRE
SAVE 31%
£479.95 RRP £693.60
Joule Cyclone Standard Direct Unvented Cylinder, 150 Litre, Stainless Steel
SAVE 21%
£479.95 RRP £609.71
Joule Cyclone Standard Direct Unvented Cylinder, 170 Litre, Stainless Steel
SAVE 21%
£483.95 RRP £614.68
Ariston Aquabravo ITI80 Unvented Stainless Steel Cylinder, Indirect, 80 Litres
SAVE 52%
£490.95 RRP £1,030.80
Ariston Aquabravo ITD215 Unvented Stainless Steel Cylinder, Direct, 215 Litres
SAVE 52%
£496.95 RRP £1,044.00
Warmflow DIRECT Unvented Stainless Steel Hot Water Cylinder 180 LITRE
SAVE 31%
£503.95 RRP £729.60
Ariston Aquabravo ITI130 Unvented Stainless Steel Cylinder, Indirect, 130 Litres
SAVE 52%
£505.95 RRP £1,063.20
Warmflow DIRECT Unvented Stainless Steel Hot Water Cylinder 210 LITRE
SAVE 31%
£519.95 RRP £752.40
Ariston Classico STI210HE-2 Unvented Glass Lined Steel Cylinder Indirect 210 Litres
SAVE 52%
£523.95 RRP £1,102.80
Ariston Classico STD300HE-2 Unvented Glass Lined Steel Cylinder Direct 300 Litres
SAVE 52%
£523.95 RRP £1,101.60
Ariston Aquabravo ITI150 Unvented Stainless Steel Cylinder, Indirect, 150 Litres
SAVE 52%
£527.95 RRP £1,108.80
Warmflow INDIRECT Unvented Stainless Steel Hot Water Cylinder 120 LITRE
SAVE 31%
£528.95 RRP £765.60
Ariston Classico STI150HE-2 Unvented Glass Lined Steel Cylinder Indirect 150 Litres
SAVE 49%
£531.95 RRP £1,042.80
Joule Cyclone Standard Direct Short Unvented Cylinder, 200 Litre, Stainless Steel
SAVE 22%
£534.95 RRP £683.76
Joule Cyclone Standard Direct Unvented Cylinder, 200 Litre, Stainless Steel
SAVE 22%
£534.95 RRP £683.76
Joule Cyclone Standard In-Direct Unvented Cylinder, 150 Litre, Stainless Steel
SAVE 22%
£545.95 RRP £699.07
Joule Cyclone Standard In-Direct Unvented Cylinder, 125 Litre, Stainless Steel
SAVE 20%
£553.95 RRP £695.83
Warmflow INDIRECT Unvented Stainless Steel Hot Water Cylinder 150 LITRE
SAVE 31%
£554.95 RRP £802.80

BTU Calculator

Below is a tool that can enable you to calculate the BTU requirements needed for your room.

There are many factors that affect this calculation including the outdoor temperature, thickness of exterior walls and the quality of insulation installed. You should also ensure you have a boiler that is capable of generating necessary output for all of the radiators in your property.

Our BTU calculator should be used as a guide only, the actual BTU requirements may be slightly different to what our calculator will produce. If you need further help, please contact us.

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1 - 36 Of Products