Has anyone used anything on a h23 for heat on chilly nights ,I know there was lenghty discussion forlarger boats but what do u do when it gets cold ? I have an older coleman radiant type heater that I had used in tents for years it does not burn it sort of glows, I know a tent has a porous surface was afraid to use this on the boat for lack of ventilation , thanks for all of the responses, Mike B