In article , ARW
writes
On 19/08/2018 12:19, alan_m wrote:
On 19/08/2018 10:58, Andrew Gabriel wrote:

Clip-on power meters have been available for many years which do
this (albeit less accurately), and their impact was identical, so
it comes as no surprise.
+1
I've had a clip on meter for many years. The novelty wore off after
around a week. The only time I now look at it is before leaving the
house for an extended time (holiday etc.) just to see that I haven't
accidentally left something on such as the immersion heater.

Could you not just have a look at the immersion heater switch:-)?



Especially easy if it has a red light on it.
--
bert