and Indirect Economy 7 hot water cylinders with combined cold water
A feature of an Economy 7
cylinder is the addition of a second immersion heater port (unlike a
standard direct cylinder that only has one). The lower of the two
immersion heaters is typically connected to an economy supply/tariff to
reap the savings of cheap rate electricity, whereas the upper
heater is normally used as a boost element and energised manually when
demand for hot water exceeds that stored.
An E7 DIRECT Combination cylinder combines a cold
water header compartment at the top of the cylinder (removing the need
for a separate header tank).
An E7 INDIRECT Combination adds a boiler
coil (heat exchanger) to the cylinder configuration facilitating a heat
input from a separate boiler. Now the cylinder can be heated by an
off-peak supply with boost if required and a boiler.
Economy 7 cylinders are well insulated so as not to
loose the heat stored overnight. All cylinders are compliant with Part L of the Building Regulations.
Furthermore, because insulation the insulation contains Polyol which is
derived from rapeseed oil the entire cylinder is 100% biodegradable and will cause no future harm to