FORD 2015 Transit Connect - Manual (Page 121)

The heater uses 0.4 to 1.0 kilowatt-hours
of energy per hour of use. The system does
not have a thermostat. It achieves
maximum temperature after
approximately three hours of operation.
Using the heater longer than three hours
does not improve system performance and
unnecessarily uses electricity.
118
Transit Connect (CHC) Canada/United States of America, enUSA, First Printing
Starting and Stopping the Engine