You always buy these cheap heaters Steve. I don't know how many time i've told you no to cheap out on heaters and buy one that costs more than $10.
I only use glass heaters and prefer visi something from marineland. There is no reason to spend money for Ti heaters if your tank doesn't include what is known as tank busters.
But yes if it is metal and you're using it in the saltwater setup then Titanium is inert and will not corode in the salty water.