The OP has a 2017 2861DS.
IMO, the best choice for a heater is one that sombody else pays for the fuel to run it.
On shore power, if you have a heat pump, that would be choice #1 until the OAT drops below about 40*f. Thats the cutoff for efficiency for a heat pump and if you have an AirCommand, that is the factory cut off. Heat pumps will work at lower temps but not well. Then there is the holding tank issue.
Still on shore power, choice #2 would be a ceramic space heater. I use mine for temps below 40*f but above freezing.
Choice #3 is your furnace. When the temp drops below freezing you should run your furnace to keep your pipes/tanks/pump/filter from freezing.
Not on shore power: The furnace is your best choice over running the genset. If you do run the genset, the same shore power temp range choices apply.
Note: A heat pump is an air conditioner that runs the fluid backwards via a valve. In residential applications, heat pumps are predominately used in moderate climate areas.
For example; Where I live heat is only needed (for comfort) 4 days a year. A heat pump, which costs more and is generally not as efficient as an air conditioner, makes no sense.
I use a heat strip for those rare days. Electric meter sings a happy tune when the strip lights up.
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Mike Dropped
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