We have a properly vented propane fireplace in the main salon which keeps that and the galley 70-degrees, a Wallas 40Dt forced air diesel heater below decks which keeps the three staterooms at 65-68-degrees (and keeps the engine room warm, too), and we apply shrink plastic on the main salon windows which really helps keep the heat in and prevents condensation. We have a single AC ceramic heater for spot heating below decks if it dips into the mid-20s. However, in the event of a power outage, we don't skip a beat.
For just heating purposes we burn an average of 30 gallons of diesel per month, and use an average of 14 gallons of propane per month. So we're around $110/mo (electricity is included in our slip fee) to keep the boat warm and dry all winter, 24/7.
For just heating purposes we burn an average of 30 gallons of diesel per month, and use an average of 14 gallons of propane per month. So we're around $110/mo (electricity is included in our slip fee) to keep the boat warm and dry all winter, 24/7.