Power Consumption Calculation

Check this out:
Power Computations

Based on Ohm's Law:

Vt = 440V

It = 5.5A

Rt = 80ohms

Pt = 2420W

KwH (12hrs) = 29.04 KwH

Kwh (24hrs) = 58.08 KwH

Yeah, I forgot that 440 is likely a three phase circuit.

(For those that don't know 1.732≈√3)

I presume that when you say "it has no resistance" that you mean that you are not given a value for the resistance. From the information you have, one cannot calculate the actual or anticipated power consumption for the whole day. This temperature controller will certainly not be heating the mold each and every second of your 24 hour period of time. If you did need it heating for every second of a constant 24 hours, you would not need a controller then. The only thing you can calculate is the maximum energy usage which is a very simple straight forward calculation of:

V*I*T=Energy → 440 V*5.5 A*24 hr≈58 kWh ≈209 mega-joules

I'm certain your ambient air temperature, insulation, mass of the mold and contents will alter your actual usage to a number less than this.

You need to make a distinction between the controller and the heater it is controlling.

The controller consumes very little power; it is the heater that is the major power consumer.

The controller may be rated at 5.5 amps, but what does the heater actually draw? If possible, find out the kW rating of the heater. Note also that the controller will cycle the heater intermittently, or will modulate the voltage to the heater. In either case, the heater does not draw its full rated power all the time. To get the actual energy usage of the heater you would need to determine what fraction of time it is on, or perhaps put a kWh meter or other instrument on it.