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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 ACV, Telford, RM Cylinders, Ariston, Heatrae Sadia and more.

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!


Ariston ST100 Wall Hung Unvented Stainless Steel Cylinder, Direct, 100 Litres
£347.17 RRP: £718.80
SAVE 52%
Ariston Classico STD125HE Unvented Glass Lined Steel Cylinder, Direct, 125 Litres
£351.83 RRP: £729.60
SAVE 52%
Warmflow DIRECT Unvented Stainless Steel Hot Water Cylinder 90 LITRE
£361.84 RRP: £524.40
SAVE 31%
Ariston Classico STD150HE Unvented Glass Lined Steel Cylinder, Direct, 150 Litres
£362.75 RRP: £754.80
SAVE 52%
Ariston Classico STD210HE Unvented Glass Lined Steel Cylinder, Direct, 210 Litres
£389.75 RRP: £817.20
SAVE 52%
Ariston Aquabravo ITD130 Unvented Stainless Steel Cylinder, Direct, 130 Litres
£400.14 RRP: £841.20
SAVE 52%
Warmflow DIRECT Unvented Stainless Steel Hot Water Cylinder 120 LITRE
£407.38 RRP: £590.40
SAVE 31%
Ariston Classico STI125HE Unvented Glass Lined Steel Cylinder, Indirect, 125 Litres
£415.24 RRP: £876.00
SAVE 53%
Ariston Aquabravo ITD150 Unvented Stainless Steel Cylinder, Direct, 150 Litres
£418.34 RRP: £883.20
SAVE 53%
Ariston Classico STI Unvented Glass Lined Steel Cylinder, Indirect, 150 Litres
£428.73 RRP: £907.20
SAVE 53%
Warmflow DIRECT Unvented Stainless Steel Hot Water Cylinder 150 LITRE
£429.73 RRP: £622.80
SAVE 31%
Telford Tempest DIRECT Unvented Stainless Steel Hot Water Cylinder 90 LITRE
£429.73 RRP: £717.82
SAVE 40%
Telford Tempest DIRECT Unvented Stainless Steel Hot Water Cylinder 125 LITRE
£429.83 RRP: £714.00
SAVE 40%
Telford Tempest DIRECT Unvented Stainless Steel Hot Water Cylinder 150 LITRE
£443.99 RRP: £733.20
SAVE 39%
Warmflow DIRECT Unvented Stainless Steel Hot Water Cylinder 180 LITRE
£452.09 RRP: £655.20
SAVE 31%
Telford Tempest DIRECT Unvented Stainless Steel Hot Water Cylinder 170 LITRE
£464.61 RRP: £757.20
SAVE 39%
Ariston Aquabravo ITI80 Unvented Stainless Steel Cylinder, Indirect, 80 Litres
£465.10 RRP: £991.20
SAVE 53%
Warmflow DIRECT Unvented Stainless Steel Hot Water Cylinder 210 LITRE
£466.16 RRP: £675.60
SAVE 31%
Ariston Classico STI210HE Unvented Glass Lined Steel Cylinder, Indirect, 210 Litres
£469.26 RRP: £1,000.80
SAVE 53%
Ariston Aquabravo ITD215 Unvented Stainless Steel Cylinder, Direct, 215 Litres
£470.80 RRP: £1,004.40
SAVE 53%
Warmflow INDIRECT Unvented Stainless Steel Hot Water Cylinder 120 LITRE
£475.27 RRP: £688.80
SAVE 31%
Biasi Hydras Unvented Stainless Steel Cylinder, Direct, 125 Litres
£475.64 RRP: £646.80
SAVE 26%
Joule Cyclone Standard Direct Unvented Cylinder, 90 Litre, Stainless Steel
£476.40 RRP: £605.28
SAVE 21%
Ariston Aquabravo ITI130 Unvented Stainless Steel Cylinder, Indirect, 130 Litres
£478.61 RRP: £1,022.40
SAVE 53%
Telford Tornado DIRECT Unvented Stainless Steel Hot Water Cylinder 125 LITRE
£480.00 RRP: £834.00
SAVE 42%
Joule Cyclone Standard Direct Unvented Cylinder, 125 Litre, Stainless Steel
£484.54 RRP: £616.32
SAVE 21%
Ariston Classico STD300HE Unvented Glass Lined Steel Cylinder, Direct, 300 Litres
£485.88 RRP: £1,039.20
SAVE 53%
Telford Tempest DIRECT Unvented Stainless Steel Hot Water Cylinder 200 LITRE
£489.59 RRP: £781.20
SAVE 37%
Telford Tornado DIRECT Unvented Stainless Steel Hot Water Cylinder 150 LITRE
£492.00 RRP: £853.20
SAVE 42%
Joule Cyclone Standard Direct Unvented Cylinder, 150 Litre, Stainless Steel
£492.78 RRP: £627.49
SAVE 21%
Joule Cyclone Standard Direct Unvented Cylinder, 170 Litre, Stainless Steel
£493.46 RRP: £628.43
SAVE 21%
Ariston Aquabravo ITI150 Unvented Stainless Steel Cylinder, Indirect, 150 Litres
£495.22 RRP: £1,060.80
SAVE 53%
Warmflow INDIRECT Unvented Stainless Steel Hot Water Cylinder 150 LITRE
£497.63 RRP: £721.20
SAVE 31%
Joule Cyclone Standard Direct Short Unvented Cylinder, 200 Litre, Stainless Steel
£498.19 RRP: £634.84
SAVE 22%
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