I see where someone installed an electric fireplace for his RV can you buy it at LOWES OR Home Depot or do you get it from an RV dealer. The job you did looks great.
Yes, you can buy them anywhere as long as it fits. Sometimes the ones that come in their own cabinet are less expensive and can be removed and installed. Or, as I did, left portable (mine is on wheels) and save the cabinet space. BB_TX did a very nice job on his install.