Wet Exhaust Sysrems
A well designed wet exhaust system will employ both a cooling water flow sensor and an exhaust temperature sensor. The ABYC standard P-01 1.7.2 states, "An indicator shall be provided that is effective at all helm positions to indicate loss of exhaust system cooling water supply. This indicator shall be independent of the engine block temperature indicator(s)." My 10 year copy of the standards makes no exception for PWCs so perhaps a newer copy might read differently. Even if an exception has been granted best engineering practices would dictate the use of the sensors mentioned above, especially when flammable materials are employed in the exhaust system.
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