I just removed my electric heater element and measured the resistance to be 38 ohms. Ohms measurements are tricky since at this low resistance meters can be off due to resistance in leads, etc. I see no indications on the heater element about Watts. Anyway, 38 ohms gives me 378 Watts at 120 V and 348 Watts at 115 V. I got nearly the same Watt number at 120 V when making an AC current measurement, so it seems credible. After reading this thread I decided that replacing the heater would be a good precaution, so I have ordered one from RV Mobile as suggest by Chris Bryant. They have one for $30 with the rating of 325 W, 120 V and I hope a measurement shows that it meets that rating. At this point I am glad I have ordered the new heater. Dometic customer service says that even 378 W is within the acceptable range and that the propane presents the greater heat input, but they have nearly a million refrigerators involved and I am sure they don't want to provide a new heater to all of them. If a new heater extends the life of my seven year old Dometic I will be very happy, though I will never know if it did or not.
