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Direct copper hot water cylinders

Direct Hot Water Cylinders

Immersion heater open vented gravity copper cylinders


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Direct Copper Cylinders

Direct hot water cylinder showing side mounted immersion heaters

Direct hot water cylinders were originally designed to be used in conjunction with solid fuel appliances and copper back boilers. Water from the cylinder was heated as it passed through a copper back boiler then returned to the cylinder.

Today DIRECT hot water cylinders tend to use electrical immersion heaters to warm their contents. Economy 7 versions are available designed to reap the benefit of off-peak cheap rate electricity tariffs.

Direct copper cylinder (shown without insulation)

Still available however for the replacement market these cylinders can be specified with boiler connections either as high flow or low flow and are manufactured in accordance with the new British Standard, BS 1566-1: 2002. They also comply with the new Part L Building Regulations.

Please note: Modern Direct cylinders are supplied with a single immersion heater boss (heater is extra). However, those designed for use on economy tariffs will usually have two heater bosses (one for off-peak heater, the other for the boost heater - as shown).  For Economy 7 models click here. Economy 7 cylinders have a thicker insulating jacket for super-low standing heat loss.

Direct vented cylinder prices

Height   Dia Capacity (litres)

inc VAT

          Direct hot water cylinder
900 x 400 98 203.27
1050 x 400 116 222.23
825 x 450 91 212.43
900 x 450 120 196.30
1050 x 450 144 212.57
1200 x 450 166 248.74
1500 x 450 222 356.94
1800 x 450 268 403.26
1500 x 500 248 520.04
1800 x 500 276 580.12

Extras and additions (please add where appropriate to prices above) inc VAT
Immersion Heater  
Cylinder boss included if required, 3kW Incalloy Immersion heater additional extra 32.00 ea
Standard foam insulation (approx 50mm) exceeding Part L heat loss Included
Upgrade insulation to 75mm thickness 68.00
Upgrade insulation to 100mm thickness 132.00
Cylinder connections  
Drain valve (drain cock) 7.50
High recovery boiler coil (improves cylinder reheat time given sufficient input) 45.00
Power shower take-off 17.50
Secondary return 12.00
Compression fittings (instead of male or female threaded bosses) 12.00
For cylinder with gravity coil (for AGA, Rayburn, Woodburner etc) click here
Configuring the position of connections (please refer to guide) No additional cost
For other modifications please don't hesitate to ask  

Somebody offered to price match? Click here to read more.....

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Direct copper hot water cylinders






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