EP11 Heater hotspot

[UKPenguin]

After finally getting both the inverter and BMS firmware updates to enable the heater in the EP11, I have to say I'm underwhelmed...

With an ambient of 0C the battery heater managed to keep the battery pack at 2.8C - and both charge and discharge were subsequently disabled.
Additionally, when I touched the battery casing there was a hot spot (I'm guessing 35C?) roughly vertically in the middle, slightly to the left and the rest of the case felt barely more than ambient.
This hot spot immediately cooled when I turned off the heater so it was clearly working (ish).

So, my question is: does anyone else observe this behaviour?

If the battery shut down charge and discharge at 0C ambient then this is outside the manufacturer's spec (charge 0C, discharge -10C).
My installer is questioning these things with Fox UK but they seem to be short on information on this relatively new battery.

[Will]

Did you have the heat from grid option turned on?
The heater is around 200w so more than capable of bringing the battery up to 15c in a couple of hours overnight.