If I could give 0 Stars I would! Will take my business else where to a place that takes care of their customer! I bought a unit that didn't go with a tank I already use. Didn't even use it and came back a few hours later to exchange it for what I actual needed and they would not exchange it! They did not tell me all sales final either! So now I am stuck with it and can't even use it! Waste of $40! Also I have a friend that went in and bought coils and they sold him the wrong ones! If you don't know your products then why have that person working for you! Guess what he is stuck with the wrong coils they won't exchange them either for the correct ones!!