should i fully unwind it then , why what could happen ,is that what they meen, the extention will over heat.
i thought they ment the heater , forgive me for sounding thick by the way .
they are concerned that the power drain will make the extension cable get too hot
as its only a 800 W its not likely to happen
BUT YES unwind the cable from the reel
i once worked in a bit of a mini workshop doing joinery, we used to have loads of power tools running, once the power went, i went and checked the RCD board and it was being fed by a extension lead from the guys house

i was amazed and got on my high horse about it, you could feel the cable getting warm BUT this was running lights, hoover ( for extraction system ) planner, chop saw, radio