I don’t have a shed and probably will leave this unit out on the patio. How rustproof is it?

I don’t have a shed and probably will leave this unit out on the patio. How rustproof is it? Do I have to get a separate cover to protect it from the elements?

It is the same as any grill product.  If it sits under rain, eventually it will start to rust.  In fact I just had an early morning rain here.  This afternoon after I flip the burner upside down to pour out any water, it works as usual.  The high temperature grill paint does not last for 2 years primarily because of the stove power.  If you mind, you can clean off the cooking oil with Easy Off Oven Cleaner, then wire brush any remaining rust off the steel, then paint with the high temperature grill paint. However I do not care that much since I’m cooking in a wok, rusty wind guard does not affect my food.  You might agree that rusty grill is an issue. Another way of protecting the stove from rusting is to put a 5-gallon plastic bucket upside down on top of the stove.  Typically you can get a 5 gallon plastic bucket for a few dollars from your local hardware store.  Although the bucket on top of the stove does not look nice, it is a practical approach.