Re: Do boats have heat?
You need a bigger boat, as the saying goes.
A small boat can't be all things, and yours is an open air boat with no cover at all. Overall, that's good, because in a boat under 22 feet an enclosure gets in the way most of the time in fair weather.
INstead of looking at outfitting the boat, outfit the bodies with better cold weather gear. Two prialry strategies: stop heat loss and cut wind exposure. For the first, wool hats. For the second, in addition to the clothes and face gators, windshields.
Add some hand and toe warmers and put them in your gloves (or hand pocket ) and on top of your toes.
Nothing does the job better than skins--serious fishermen bib overalls and jackets.
You need serious PFD's in cold weather boating. A good military issue float coat is warm as toast and safe safe safe.
Most cold weather fatalities are found wearing cotton.
I fish in open waters at night until Dec. 31 and duck hunt through the end of January, small open boats the whole time, often alone in remote and/or dark areas. I take comfort and safety very seriously and accomplish both at the same time.