Is the Frigoboat keel cooler more efficient than another system I have seen that uses a modified thru-hull fitting for the condenser?
Both systems work on the same principle & will probably show comparable performance when the boat is under way or rocking in a choppy anchorage. But whereas the Frigoboat keel cooler dissipates the heat into the water surrounding it, the modified thru-hull heats up the water inside the thru-hull which is recessed up into the boat. Unless the vessel has substantial motion, the heated water cannot escape, so that as the column of water heats up, the system becomes increasingly less efficient.
