does the power switch to the cylinder need to be left on ?

[se London man]

Hello i have a 300l centre store unvented indirect cylinder. does the power need to be left on for this ?

is it left on to keep water at temperature all day ?

for a previous system i had a power switch for the immerison heater that was only turned on in an emergency

thanks

 

[Ric2013]

If the power switch is for an immersion heater and isn't just a backup to another heat source e.g. gas boiler, then you need to switch it on to allow the immersion heater to work. The immersion heater only runs as long as it needs to heat the cylinder, so you could turn it off overnight, say, if you wanted, though there would be very little advantage in doing so.

But you may find the cylinder is heated by a gas boiler elsewhere in the property and the immersion is merely a backup device.