What is the specification of the heater inside the Flir A310f housing?

External power operation (heater) 24 VDC.
25 W max w/heater @ 24 VDC.
External power, connector type (heater) 2-pole jackable screw terminal.
Voltage (heater) Allowed range 21-30 VDC.
The heater is switched on at +4°C and off at +15°C.
The heater is on or off so it is 0% or 100%.