The seller was a very interesting man and a self described "sailboat guy". He told me that he installed the Sig marine wood burning heater as it was easy & safe to use on a boat & he wanted one in his RV.
Here is the official info-
Sig Marine wood heater website-
http://www.sigmarine.com/products.htmlThe one in my RV is called a "Cozy Cabin" -
http://www.sigmarine.com/SIG-CCHSF.html
The seller must have been an engineer because he made serious accommodations for this heater installation including a powder coated steel isolation box-

He used the factory stainless steel vent pipe through wood doughnuts-
inside-

On the roof the all weather cap (I sealed this wood ring up ) -

I plan on replacing the wood rings with ones made from aluminum in the spring.
A full area view-

I fired it up and it works great -

The seller also made a holder for a bottle of lighter fluid, a barbeque style lighter and a box to hold small pieces of wood fuel. And all of it does not impede the use of the entrance door or stairs -