Back in 1992, I fitted a 3 kW Eberspacher forced air diesel heater. It has been reliable.
A long time, somebody warned me that although they will heat the boat, they will not dry the boat. They are right, and I have grown tired of it. You arrive with the boat damp, you start the heater, and 12 hours later you leave with the boat warm and damp, with condensaton just about everywhere. I have tried opening the hatches a wee bit to gain some air circulation, but it made little difference, and there is no point in opening all the hatches as the heat leaks out. I guess the problem is that the Eberspacher just re-cycles the boat's air, and does not draw in "new" air to aid the boat to dry.
So here comes the question. I have been on board a few ships that used a solid fuel heater, using charcoal. They certainly dry the boat, and very quickly. But, will a diesel heater operating on the same idea do the same job, namely, will it dry the boat? I dare not burn wood in a solid fuel heater, as there will be smoke a-plenty and I am not into that. I could go the charcoal route, perhaps even the diesel route with one of these, for example...
Newport Diesel Heater for boats.* Manufacturer: Dickinson Marine
.... but I have got to be sure it will dry the boat before I begin that installation.
This looks like another good one....
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I have not got a great deal of space, but there is one place on the ship where it could go, as long as it will be effective when it does. It really must assist in drying the boat.