[Chris Burkard]

First - new generation (1992.5 and newer - If the 31 Tiara has a transom door it is a new generation 31) 31 Tiaras (gas) used 5.0 Westerbeke generators mounted aft between the engines in the engine compartment. Older gen 31s mounted them in the aft lazzarette behind the fuel tanks. Any generator manufacturer will work provided it fits, allows access to service points and is large enough to handle the load you are looking to put on it and most importantly it is marine certified and water cooled! I personally would have a qualified marine generator company install it. There is too much to go wrong if you don't know exactly what you are doing. An intake through hull will have to be installed, fuel systems connections, along with a muffler/exhaust system and then the electrical wiring. Anyone of these things done incorrectly can be very dangerous.

P.S. - Air-cooled generators do not meet U.S. Coast Guard standards for being mounted inside the hull of a vessel! Gas generator exhaust contains carbon monoxide which is deadly if inhailed in high enough concentrations. Setting a self contained, air cooled generator anywhere in the cockpit or helm deck to power the vessels electrical system is a recipe for disaster! The exhaust will find its way into the cabin and could have deadly results! The other issue is that an air-cooled generator is not ignition protected! It could easily ignite fuel vaports and turn your boat into a bomb!