I have a '92 H28 that I sail in Maine. I would like to extend the sailing season on both ends by adding some sort to heat to my boat. A friend of mine installed an Espar diesel fired forced hot air system (dry heat) on his boat and it is great. I am considering installing an Airtronic D2 unit in mine but they are a fairly expensive. Does anyone have any first hand knowledge on these units (especially in a H28) or a better alternative? Thanks.