.

Thereof, do you leave storage heaters on all the time?

they should be left on all the time if they have been wired correctly. Depending on the heater there may be 2 connections at the wall, one will be for a convector heater built in to the storage heater and is there to add additional heating if required.

Likewise, how long should a storage heater last? 6 to 8 years

Similarly one may ask, do storage heaters use electricity during the day?

There is no need to touch the input switch during the day, as storage heaters only use electricity at night. The output switch may require attention throughout the day.

How do night storage heaters know when to come on?

It's not some sort of mystic telepathy with the electric company – the reason storage heaters know when to switch to night-time rates is because they're wired into a separate electricity meter that only activates during the designated off-peak hours.