My 2 cents. I would go with the water heater type as sold by Curtis and others. You have lots of hot water from the engine they are not difficult to install and you would not be adding extra load on you altenator system so extra lights don't become an issue later on. I was out in -8c / 17.6f winter storm plowing snow and had to turn the fan from hight to low because it was too warm in the cab.</p>
Thanks for the feedback. Since I am in southeast Texas, I cannot justify the higher cost of the Curtis heater. We just need a little heat to knock off the damp chill. Very seldom gets below 30 degrees F here. Don</p>