I'd like to see a demo on YouTube of an induction cooktop of any power up to 1500 watts kicking the butt of an RV propane cooktop's high BTU burner when heating water. Note I'm NOT referring to a standard RV cooktop propane burner ... but the high output one that is included in some RV cooktops (like ours, for instance).
BTW, the new propane cooktop being installed in our stick house has one of it's five burners rated at a BTU level that's through the roof - the grill covering it is even extra large for holding crab pots, etc., right in the kitchen if we want so we don't have be outside for large boilings. We could kindof do that in the RV if we wanted to.
I will concede that propane cooking can heat up an RV more than induction cooking. However, that is often a desirable thing in an RV. Our RV's cooktop overhead fan does vent a lot of residual heat to the outside if the weather is warm and our roof vent fan can also aid the cooktop fan in getting rid of interior cooktop heat as it occurs.
I thought the claims-to-fame for induction cooking, if you have the electricity for it, were safety from hot burners and ease of cleanup on a smooth surface.
BTW and speaking of the ease of cleanup of a smooth surface cooktop - don't the marine diesel cooktops have a smooth surface where the cookware sits?