In article , simon
mitchelmore wrote:
My friend is too scared to turn on the immersion heater during the day
because she is absent minded and only remembers its on a few days later
and so gets big bills. She'e on Economy 7, so its set for night time
operation but being a small capacity it sometimes runs out of hot water
in the afternoon.

Does anyone know of a simple button type switch I could fit for her which
could be preset for say 2 hours (ON), so she can hit it (to boost the hot
water) and forget it. I've already fitted a red indicator light in the
hall but this does not solve the problem.

I've seen similar device for communal lighting but they only work for say
5 mins.

TLC sell such a device. I fitted one in our village hall on an electric
room heater - in case the hirer forgets to turn it off.

https://www.tlc-direct.co.uk/Main_In..._2/index.htmle

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle