In message ,
"Christian McArdle" wrote:

Fixed immersion water heaters 15 litres should be powered by their own
separate circuits.

Not to my knowledge. However, you may not apply diversity, so a 3kW @ 240V
heater needs to have 12.5A of a circuit dedicated to only its requirements
that can't be borrowed by another device. This would preclude it from being
installed on a ring main or socket radial circuit. However, a 16A radial
circuit with a 13A FCU to the immersion and a 3A FCU to the pump is fine.


Ok, looked it up. The requirement isn't in the regs, per-se, but is in
the OSG, Apx 8, p 154. The setup you describe will probably be ok, but
given the above probably wouldn't be considered "best practice".

Hwyl!

M.

--
Martin Angove: http://www.tridwr.demon.co.uk/
Don't fight technology, live with it: http://www.livtech.co.uk/
.... I like Boolean logic. NOT!