It has been suggested that I measure the resistance of the nozzle heater on my printer since I've had some thermal runaway errors. The machine is brand new. I have done so by connecting my multimeter across the two pins on the connector. I get a value of 14.5 Ohms. Is this a reasonable value?
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Your printer uses a 24 V power supply, this implies that the peripherals also need to be for this voltage. Therefor a 24 V heater cartridge is needed.
From this answer on question Heater cartridge with 7.2 ohms - 12 or 24 V? gives you the answer:
e3D Heater Cartridges are documented to be around 4.8 Ω for 12 V & 30 W, 3.6 Ω for 12 V & 40 W, 19.2 Ω for 24 V 30 W and 14.4 Ω for 24 V 40 W.
A heater cartridge of 14.5 Ω is a 24 V heater cartridge of 40 W, this is the correct heater cartridge for your printer.

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