wrote:
On 17 Mar, 13:36, David Hansen
wrote:

"Water heaters having immersed and uninsulated heating elements" and
electrode boilers are the same thing.

Sorry that's completely wrong. An electrode boiler passes current
directly through the medium to be heated. See, for example,

http://www.collins-walker.co.uk/summary.html

(should you happen to need a 3.5 MW 'immersion heater' :~) ).

OTOH an immersed and uninsulated heating element is just that - ever
seen an Australian electric kettle?

--
Andy