Ventless heaters can be an attractive option since they are typically advertised with super high 99.9% efficient ratings, but just be aware that because they are not vented, all of the byproducts from the combustion will stay inside the RV and therefore the heaters do require a fresh air source to the RV.
You may also want to investigate from those that use the heaters how much of an issue they encounter with moisture from combustion condensing on cold surfaces within your RV
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Joe & Shelly, Justin, Tyler, Alyssa | Butler PA 2008 Tiffin Allegro Bus 43QRP|Cummins 425|Honda CRV
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