Maxistore was developed for use on an open-vented system in electric only applications. The cylinders carry full Economy 7 accreditation and is manufactured to BS1566:2002 (Part L). To ensure maximum efficiency the cylinder is foamed twice, which reduces the heat-loss values. Two side entry immersion heater connections are fitted as standard to maximise the use of Economy tariff electricity.

Telford Copper Cylinders can also supply, as a cost option, suitable immersion heaters and economy tariff time clocks. These can be supplied either factory fitted or supplied separate for on-site installation.