In article , Mike Tomlinson
writes
In article , fred writes

V clever little design, transparent plastic case in two parts with a
central divider, keeping the two elements apart and forming a narrow
channel for the water to pass over the coiled resistance wire elements.
Unsurprisingly, the cold water enters on the blue flexible plastic pipe,
flows left along the bottom and returns to the right along the top
channel, exiting on the red.

Looks a fairly modern design (plastic cable ties, brown for live, blue
for neutral etc.) but the concept still scares the **** out of me.
Reminds me of those toasters from the last century with drop-down sides
that exposed the live elements.

Installed 1983 the sticker says, so 25 years old.

I see where you are coming from with the scary concept idea but water
really isn't that good a conductor. IIRC 6mm is the safe air clearance
distance live to earth so 500mm (along the plastic pipe) of water should
do just as well.
--
fred
BBC3, ITV2/3/4, channels going to the DOGs