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Diode
I've got a tenant who claims her 3 storage heaters don't work. I wired an extension and plugged them in to see if they were functional. They all worked. I left power on for about half an hour then disconnected them. It then seemed Like they continued to heat. I was expecting them to only come on at night. They're not the type with the function to turn them on during the day. When I tried to turn them on during the day, nothing happened, as I'd expected. But why would there be no heat created through the night? The controls were set at about half way so they should've heated a bit at least.