Go to a marine supply store that sells driftboats and you can get one that will have a mounting bracket to put it under the foredeck. It will radiate heat right at the front passengers.

I used to take a big beach towel and lay it over the top of the foredeck, and then put the other edge over my lap. That keeps in all the heat. Be careful if your seat is moved all the way forward, tho. It can burn the fuzz off your shins. Turn the adjustment down to the lowest level.

There is also another mounting bracket that enables you to put a heater aimed at the oarsman, tho when I'm reefing on the oars, the last thing I want is a heater making me sweat more.

diana