Water Heater Upgrade From January 99 Mainsheet 2/1/1999 An upgrade is available from Westerbeke to improve engine-sourced hot water. This moves the hose connections for the hot water heater from the original port side of the engine to a set of connections at the water pump and thermostat. A new fitting is required for the thermostat housing tap. The water pump housing has an extra tap that can be used. Samantha (#31) has been configured in this manner and the hot water whilst cruising has been very nice indeed.