@KimSJ yes, however in their favour they are very transient - more like a kettle.

Electric showers are only in use for say 5-7 minutes (on average), so not really a big issue for cutout fuses (thermal heat) or the grid (power demand) here due to diversity (ie not everyone will be showering at the same time).

That said, an electrician probably has to add this in which pushes up the diversity load.

Strategically there should be a move to stored hot water using #HeatPump #ASHP

@Stephencrown I confess I’d never considered that an 80A fuse might take more than four hours to blow with 100A current. I also didn’t realise that a supply could be upgraded just by changing the fuse. (I assumed I was stuck with my 60A feed unless I paid a fortune to have the road dug up.) That’s stopped me considering installing a second electric shower, in fact. I guess I need to talk to my supplier…

So, thank you for opening new possibilities!

@KimSJ fuse upgrades (to 100 or 80amp) are free!

Ours was (4 hour service cutout replacement as original from ~1940’s only allowed up to 60amp fuse max, and that included digging the garden up to isolate it while work was going on), and my dads was (5min fuse replacement job)

Which area of the country are you in?

#UKPowerNetworks for example has this page:

https://www.ukpowernetworks.co.uk/i-already-have-electricity-domestic/adding-more-power/fuse-upgrade#Apply