Heating a RV very much depends on the source of power you have available.
For example a RV hooked up to a good electric source can easily use electric heating units. Of course while camping away from a good electric power source propane likely is a better option.
Each have their pros and cons which ever scenario different often a combination of the two is good.
Electric units are great as long as there is a power hookup. Keep in mind also how much power can be pulled from a source since electric heaters can pull a lot of power and possibly trip a breaker.
For example a standard home A/C power outlet has a 15-20 Amp breaker. A standard electric heater uses between 800-1500 Watts which needs a 20 Amp beaker to run safely. Any more electric devices run from the outlet will trip the breaker.
If you have a good power source such as at many camping sites or camping parks than this will not be an issue. For those who have a less than desirable A/C source propane is likely a better option.
What is a good electric unit for a RV?
Most any electric unit can be used in a RV even cheap ones from Walmart. Personally I like the Broan-NuTone 6201 Big Heat Heater. It has many features others don’t that make it ideal for a RV such as overheat protection that shuts the unit down if the surrounding area becomes too hot and instant shut off on tip over.
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Broan-NuTone 6201 Big Heat Heater
Using propane is a good option when away from an electric source or as emergency. A good propane heater is hard to beat since they can put out some good heat anywhere.
The only real problem with propane is having to lug around and refill tanks constantly which can become a pain times.
With that said propane is the best in my opinion heating a RV especially on a very cold night. Most will have a installed heater in their RV which can use propane.
There are also many small portable propane heaters that come in all shapes and sizes. My favorite is the Mr Buddy which has a low oxygen shut off.
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Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Radiant Heater
If a small portable propane unit is used be aware they use a lot of oxygen in a small space, and put out carbon monoxide which can be dangerous.
Leaving a window or door cracked open is a must when such a unit along with a automatic shut off if the levels become too high.
The above propane and electric heater used to heat a recreational vehicle are simply my favorites with no doubt many more available.
If you have a favorite good unit let me know in the comments below.
Be sure to read the reviews on Amazon or elsewhere to be sure it is a good fit for you.