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Combination Copper Hot Water Cylinders

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Combination Copper Hot Water Cylinders by Gledhill

FORTIC TANK - Hot water cylinders with built in header tank

Index Page > Hot Water Cylinders > Combination Hot water Cylinders

What is a Combination hot water cylinder?

A combination cylinder (also known as a Fortic Tank) is one that incorporates a cold water header compartment that one would normally associate with a separate header tank. The convenience of a simple one-piece installation is clear and the design lends itself to properties like flats or apartments where a lack of loft space makes it difficult or impossible to site a header tank.

Drawbacks of combination type hot water cylinders

Combination cylinders are not the best solution to all installations. Resulting hot water pressure from a combination cylinder is generally poor because the header section (the bit that creates gravity pressure on the cylinder) is at such a low height. (note: the higher the header from the outlet point, the higher the pressure due to gravity)

The low pressure associated with combination cylinders can be frustrating. Mixer showers tend to suffer noticeably. The temptation exists to install a booster pump to improve performance, but consider carefully before you do so. The volume of cold water contained within the header can often prove inadequate to keep up with the extreme demands of a booster pump so you risk running your system dry fairly quickly. This is not good for the booster pump and can cause damage.

All cylinders are fully insulated with a thermally advanced and environmentally friendly jacket, offering continued high performance throughout the life of the cylinder. At the end of it's life the insulation decomposes so it's also environmentally friend too.

Delivery to most mainland destinations within 2-3 working days.

Speed, Superior Quality and check out these discounted prices...

Indirect combination hot water cylinder showing boiler coil, optional immersion heater and cold water header compartment with float valve

Above: A schematic showing how combination cylinders work.

Combination hot water cylinders can be either Direct (heated by an immersion heater), Economy 7 (fitted with two immersion heaters and extra thick insulation) or Indirect (fitted with a boiler coil and immersion heater). Indirect cylinders can be made to an Economy 7 pattern.

Rectangular Combination Units also available - please call for information

Direct and Indirect combination hot water cylinders

Hot water cylinder incorporating built-in cold water compartment. Heated electrically. (Historically known as 'Fortic Tanks'.

Direct Combination Copper Water Cylinder



Combination Direct hot water cylinder with built in header tank heated by immersion heater (also known as Fortic tank)




For Economy 7 model please click here



Capacity (hot/cold)


Price inc vat

900 x 400


36 x 16


1050 x 400


42 x 16


900 x 450


36 x 18


1050 x 450


42 x 18


1200 x 450


48 x 18


1400 x 450


55 x 18


1500 x 450


60 x 18


1800 x 450


72 x 18


For the ECONOMY 7 version Combination Cylinders please click here

Indirect Combination hot water cylinder (also known as Fortic Tank) heated via boiler coil and optional immersion heater. Built in cold water header tank.


For Economy 7 model please click here

mm Capacity (hot/cold) inches Price inc vat
900 x 400 65/15 36 x 16 294.46
1050 x 400 85/20 42 x 16 307.07
900 x 450 85/20 36 x 18 307.07
1050 x 450 115/20 42 x 18 329.55
1200 x 450 115/40 48 x 18 338.85
1400 x 450 144/40 55 x 18 417.56
1500 x 450 166/40 60 x 18 436.96
1800 x 450 210/40 72 x 18 480.74


Additions and optional extras

Options available at additional cost include:


Compression fittings (instead of threaded bosses)



Shower take-off



Additional Tappings (pairs)



Secondary return



Immersion Heater (Incalloy) 3kW alloy coated (corrosion resistant)



Drain valve (drain cock) [threaded boss included on cylinder]



Hi recovery boiler coil (pumped)



Super Recovery coil (Pumped)



Ball valve and overflow (supplied loose - not installed)



Additional immersion boss (already supplied with one)



Gravity boiler coil with 28mm connections

(Large bore for AGA, wood burner, unpumped heat source etc)


(please add to stated price)

Positioning tappings to your specification does not normally attract a supplementary charge


When sizing a cylinder remember the stated dimensions do not include the thickness of insulation. You must add the thickness of insulation to the cylinder dimension to obtain the finished size. This is most important if the cylinder needs to pass through a doorway or access hatch. Make sure you have enough room to make connections and service immersion heaters.

Illustrations are for guidance only and should not be interpreted as an exact representation.


Note: Cylinder illustrations are for guidance only. The relative location of the hot water outlet to the immersion heater may be positioned to customer requirements thereby enabling easy fitting/retrofit. Please refer to Designing a Cylinder section.

In the cylinder industry nothing should be assumed or regarded as 'standard'. Features such and as the position of connections, a shower take off, drain, boiler control stat/sensor pocket or any other item should be stated as a requirement, not assumed.



For ECONOMY 7 Combination Cylinders please click here


Combination Copper Hot Water Cylinders



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