I bought many of these ceramic heaters to prepare for the winter season. We rode our 37-foot-5 wheel the whole time and planned to use it in conjunction with our skirt to warm the dead air underneath. It vibrates as described, but the low fan speed leaves a lot to be desired. As mentioned, I'm comparing this to at least 4 others I have. This is used as a backup for the interior of the RV. It works well for a personal heater, but don't expect it to literally blow away.
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