Answer
The chart below can be used to guide your choice. It is recommended that you use 24 gage wire for power or double up 28 gage wires.
Wire Count: 9KW Power = 2 wires (54 suffix if power is doubled up, or 66 suffix with 4 unused 28AWG wires) 9KW w/ RQE = 4 wires (56 suffix if power is doubled up, or 66 suffix with 2 unused 28AWG wires)
45HW Power = 2 wires (54 suffix if power is doubled up, or 66 suffix with 4 unused 28AWG wires) You will need a 2 additional 28AWG wires if the following sensors are called out on your model number: RQE, DS, or LS. Also IDH* is a sensor option that would require 4 additional 28AWG wires)
*IDH = a sensor option for 45HW that adds both RQE and DS.
IDH MAX Always has 2 power wires and 2 data wires = 56 Suffix (if you double up the power wires) or 66
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