Our boat does have a cored hull
. There is a lot of heat loss through the glass though, and we do not get condensation
forming on the windows except when boiling water
in a closed cabin
. I am wondering if those with humidity problems are using all radiant heaters and do not have any ventilation. Our system uses fan heaters (small radiators with a fan) which heat the air in the boat. Hydronic simply means that liquid is used to transfer energy from the heater to the spaces to be heated. Fan heaters, radiators, or loops of tubing below the floors are the various means of delivering the heat energy to the desired locations. In any event it seems the hunidity issue is a function related directly to lack of adequate ventilation rather than heating
method. It might also be worsened if the heat system is undersized, making one reluctant to ventilate adequately.