Do all water haters have a magnesium rod in them

They are called anode rods and every heater has one to protect the tank. They can be either aluminum, or magnesium depending on the mineral content of the water.
Did that answer your question? Regards, Tom

This applies to tank type heater, a tankless heater will not have a sacrificial anode or stink rod. Why do you ask?

Thanks for the backup Bob! I tried to rate you but it wouldn't let me. Thanks, Tom PS. I'm not even going to rag on you about the weather I see on TV in your area. Stay warm, Tom

Chicago, weather is bad now so you know it will be worse tomorrow. 5 degrees when I wake up, if I wake up.

Hey, it's nice that the south takes a little snow and cold for us up in on the north side. Good citizenship indeedy.

I heard it snowed once in Florida, Governor declared it a state of emergency

Hehehehe

Last time it snowed in hollywood all the actors were in the street trying to sniff the stuff up their nose.