New shower - cable size?

Soldato
Joined
13 Jan 2004
Posts
12,751
Location
Leicestershire
Hi.
It is not a new install of cable so does not require part P(is that right?) as it is just the shower.
What shower size can a 6mm twin earth cable support?
Regardless of limiting factors the Triton T80i i have used for last 2 years has been fine.
Guessing that's an 8.5kw so I'd be ok with a direct replacement size - is my logic right?
 
If i was going 10.5kw i know I'd need to upgrade wiring.

As it's only 8.5kw I'm right in thinking i don't need it certified as like for like swap?
 
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