On Mon, 3 May 2021 17:21:43 +0100, Andy Burns
wrote:

Scott wrote:

What fuse would you fit for an immersion heater though? It would need
to be more than 13 amps (or would it?).

No, a 3kW immersion needs no bigger fuse than a 3kW kettle.

I realise that but I just thought it would be running at the top end
of the range for extended periods whereas a kettle is only for
intermittent use. I thought some headroom would be needed but I may
be completely wrong.