plastic head, longer non-heating end, nickel-plated, single-phase, el. plug
Heating elements with no thermostatic head are intended to be controlled by a heating system controller only, or possibly by a separate contactor, adjustable and safety thermostat.
Heating elements with a thermostatic head are intended to be controlled by the integrated adjustable thermostat. The head is also fitted with a safety thermostat, power cable and contactor that permits control also by Ripple control and by a heating system controller.
Heating elements are either made of nickel-plated copper for use in enamelled hot water tanks and thermal stores, or of copper with no surface treatment for use in thermal stores only (not designed for use in drinking water), or possibly also of stainless steel for use in stainless-steel hot water tanks and thermal stores. The heating elements with a longer non-heating end (180 mm) are intended for use in combination tanks, e.g. DUO, HSK.