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The manual said 9.5kw at 240v, drawing 39.6amps but worth remembering that it only draws 39.6 amps if you have an exactly 240v supply.
As a silly and extreme example if you actually had the UK minimum permitted voltage (230v - 6%) and had 5v further volt drop over 17m of 6mm T+E it's now pulling 45 amps. Unlikely of course.
10mm csa cable would permit a higher value MCB and suffer less volt drop, and as above be more suitable in the first place.
I've just read this thread for the first time, and then read it again. Can't believe that no one picked up on the fundamental error in the first quote, and then found it repeated in the second!Indeed. I was also going to point this out. Using 230 volts results in 41.3 amps, so a 45 or 50 amp OCPD would be needed.
The manufacturer's spec. for this heater is 9.5kW at 240V. I calculate that as a resistance of 6.06 ohms.
At 230V - 6% -5V (=211.2V) the heater will draw 34.9A NOT 45A, and at 230V it will draw 37.9A NOT 41.3A
It's the resistance of the element that's fixed, not the heating power in kW.
To draw 45A, the voltage at the heater's terminals would need to be 273V