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Before you install your heater cartridge, you should double check that you both purchased and received the correct voltage cartridge. This process is less annoying than putting out a house fire.

Your heater cartridge will be either 30w or 40w, with blue and red wires receptively.

If you have a 12v heater cartridge, your resistance reading will be (about) 3.5 or 4.8 Ω for 40w and 30w respectively.

If you have a 24v heater cartridge, your resistance reading will be (about) 14.4 or 19.2 Ω for 40w and 30w respectively.