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The answer can vary widely based on a home's age and design. As with any type of remodeling project, assume that every structure is load-bearing until confirming otherwise with a structural engineer. Almost all modern homes have chimneys that are fully independent from the rest of the home's framing. As a result, they don't bear any load beyond their own weight. However, many historic homes built prior to the 1900s contain load-bearing chimneys that tie into the surrounding roof and floor joists. If possible, use a home's blueprints or look for chimney connections that indicate load-bearing qualities to get your answer.

The height of the chimney for your outdoor fireplace depends on where the fireplace is located. Ideally, the chimney should be 2 to 3 feet higher than surrounding structures; this allows smoke to ventilate properly without endangering anyone or anything.

Note: Your municipality may have strict requirements regarding chimney heights, so it’s always a good idea to check local building codes.

Some types of electric fireplaces use more electricity than others. Models that produce 1,500 watts will have more of an effect on your heating bill than 750-watt models. 

Electric fireplaces use an average of $1.85 of electricity every eight hours. These minimal operational costs aren’t likely to make a big difference in your electric bill—unless you’re using it as a primary heating source for your home and it’s running most of the time.

Electric fireplaces give off more heat than you might think. Because they don’t lose heat through a ventilation system, which is required for wood-burning and gas fireplaces, they’re able to disperse more heat into the room. However, many electric fireplaces are limited to a max of 5,000 or 5,200 BTU heat output, and you can get more from traditional fireplaces.