From the manual:
Depending on ambient temperature it may be necessary to pre-heat the engine. If it is necessary to pre-heat the engine, the engine is equipped with a block heater that can be plugged into an external 120 Volt AC outlet. However, it is recommended to use the Hydro-Hot engine preheat function to warm the engine. The Hydro-Hot engine pre-heat function will heat engine coolant and the interior. An indication of 100o F or higher of the engine temperature gauge is suf cient for the engine to start.
Block Heat:
The switch labeled Block Heat operates the receptacle for the block heater cord. The block heater is rated
at 1800 Watts. For ef ciency, hook to shore power in the event it becomes dif cult to start the generator. An auxiliary method is to plug the block heater cord to a separate power cord, as long as the power cord is rated for 15 Amps and the outlet used is GFCI protected rated at 20 Amps. The engine may require several hours of pre- heating before before starting. It is recommended to start pre-heating the engine the night before departure.
NOTE:
The inverter should never be used for the power source. Rapid battery drain and
To Use the Block Heater System:
• Hook to shore power and plug in block heater cord to the receptacle. • Turn on the Block Heat switch at the dash.
Joel