and Indirect Economy 7 cylinders with combined cold water
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
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
Compliant with Part L of the Building Regulations.
Furthermore, because it is biodegradable it will cause no future harm to