Watts of F250 block heater?

[ChuckN]

I'm curious if anyone knows the draw from a block heater in a 7.3L F250 diesel.

Reason I ask is I may need a generator for a trip in extreme cold and I don't want the old beast frozen on the lake. I would love to bring a generator just in case, but unsure what size generator I'd need to get the job done. Thanks

[Jeremy airjer W]

500 watts.

[ChuckN]

Thanks Airjer.

[Macgyver55]

Chuck, we have many in our trucks that are 1000 watt but I've run them with my Honda 1000 and it works fine. It is working hard but it handles it ok.

[Jeremy airjer W]

I should have said aftermarkets are generally around 500 watts, Factory can be a whole nother ball game.

[ChuckN]

Thanks Mac. I know my aftermarket car block heater is 500 watts, but my diesel one sounds 10X the power as it's loud and does a great job. I'll be putting a generator to the test soon, just wanted some advice before I possibly harm one.