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Economy 7 Combination Hot Water Cylinders

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Economy 7 Combination cylinders by Gledhill

Off-peak electric hot water storage by Gledhill

Index Page > Hot Water Cylinders > Economy 7 Combination Hot water Cylinders

Economy 7 Combination copper hot water cylinder

Direct and Indirect Economy 7 cylinders with combined cold water compartment

An Economy 7 cylinder is designed to exploit cheap 'off-peak' electricity, typically available through the night.

An E7 Combination cylinder combines a cold water header compartment at the top of the cylinder (removing the need for a separate header tank) and heats the water in the main body using electrical immersion heaters.

A feature of an E7 cylinder or tank is the addition of a second immersion heater (unlike a standard direct cylinder that only has one). The lower of the two elements is typically connected to the economy supply/tariff, the upper heater is usually used as a boost element and operated manually when demand for hot water exceeds that stored. Our cylinders are supplied with the two immersion heater bosses (the bit you screw the heater into) but immersion heaters are sold separately. Please enquire.

Because you are heating your cylinder overnight it is important to not to loose the stored heat by the morning. Economy 7 cylinders are therefore fitted with an extra thick jacket of insulation - Nominally 50mm thick, as opposed to the 30mm jacket on a standard cylinder.

Compliant with Part L of the Building Regulations. Furthermore, because it is biodegradable it will cause no future harm to the environment.



Economy 7 DIRECT Combination hot water cylinder heated by two immersion heaters



mm Capacity hot/cold (litres) inches Price inc vat
900 x 450 65 / 20 36 x 18 POA
1050 x 450 110 / 40 42 x 18 POA
1200 X 450 120 / 40 48 X 18 383.00
1400 x 450 144 / 40 55 x 18 386.47
1500 x 450 166 / 40 60 x 18 412.78
1850 x 450 210 / 40 72 x 18 455.35



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Economy 7 INDIRECT Combination hot water cylinder with two immersion heaters and boiler coil



mm Capacity hot/cold (litres) inches Price inc vat
900 x 400 65 / 15 36 x 16 341.74
1050 x 400 86 / 20 42 x 16 362.87
1200 x 400 110 / 20 48 x 16 419.43
1400 x 400 126 / 20 55 x 16 436.51
1500 x 400 140 / 25 60 x 16 457.99
1800 x 400 145 / 30 72 x 16 537.57
900 x 450 85 / 20 36 x 18 341.74
1050 x 450 115 / 20 42 x 18 362.87
1200 X 450 120 / 40 48 X 18 419.43
1400 x 450 144 / 40 55 x 18 436.51
1500 x 450 166 / 40 60 x 18 457.99
1800 x 450 210 / 40 72 x 18 537.57


Additions and optional extras

Options available at additional cost include:

  Compression fittings (instead of threaded bosses) 12.00
  Shower take-off 17.50
  Additional Tappings (pairs) 18.00
  Secondary return 12.00
  Immersion Heater (Incalloy) 3kW alloy coated (corrosion resistant) 34.00
  Drain valve (drain cock) [threaded boss included on cylinder] 7.50
  Hi recovery boiler coil (pumped) - indirect model only 45.00
  Super Recovery coil (Pumped)


  Ball valve and overflow (supplied loose - not installed) 15.00
  Additional immersion boss (already supplied with two) 18.00
  Gravity boiler coil with 28mm connections (Large bore for AGA, wood burner etc) - Indirect model only


(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.
Note: Cylinder illustrations are for guidance only. The relative location of the hot water outlet to immersion heaters (and boiler connections where applicable) may 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.

Economy 7 off peak combination hot water cylinders



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