The Xtreme website is awesome ! If you can’t find the information you need, you can always call Steve. They were easy to install and think they will certainly serve their purpose so we get to use our boat throughout the winter months without having to winterize.
We were short a bracket so they shipped one right away.Unfortunately we did not realize we really did not need them. Hope there is no problem in returning. I think the purchase of our heaters was a great choice and saved us big buying the two for the price of one.