The following is the approximate cubic footage the propane heater can heat depending on an average climate that it's installed in, the altitude being sea level and an average amount of insulation built into the structure.
P12000 - 12' x 12' x 8' = 1,100 cuft
TheDickinson Marine Newport Bulkhead Mount Propane Heater has a combustion process that is completely isolated from the inside of the boat by the unique, direct vent design. A built-in blower provides good heat circulation. The Heater is sold with a stainless steel backing plate and 28 inches of flexible, double stainless chimney (propane regulator, hose, tank, etc. sold separately).
Easy to install - easy to use
High temperature stainless burner and components
Large ceramic glass flame-viewing window with high radiant efficiency
Safe, direct-vent operation with airtight combustion chamber
Unaffected by motion, winds or weather conditions
Variable heat output and excellent thermal efficiency