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A liter of bioethanol costs $11 and burns for around four hours, making it cost around $2.75 per hour to keep your bioethanol fireplace running. For comparison, natural gas costs around $0.50 per hour, and propane costs around $1.60 per hour. 

How much it costs you to run your bioethanol fireplace largely depends on how often you use it. Hypothetically speaking, if you run your fireplace for four hours a week year-round, you’ll go through one liter of biofuel per week or about $570 per year to run the fireplace.

You can close up a chimney instead of demolishing it. Homeowners often go this route because the cost of removing a chimney, especially a structurally important chimney, can be expensive.

Properly closing up a chimney involves closing and sealing the damper, installing a chimney cap damper, and sealing the fireplace opening with a door or bricks. The cost to seal and cap a chimney is around $500 to $650—significantly less than the average chimney removal cost.

Signs that your chimney may need to be replaced include visible damage like cracks in the structure, bricks, or mortar, as well as crumbling or flaking mortar and loose bricks. Leaks, dampness, discoloration, and efflorescence (a white, stain-like substance on the bricks) are also key indicators of water damage, which can compromise the chimney's safety. Addressing these problems is essential, as a chimney in this condition may be at risk of collapsing and causing major damage to your home. A full replacement costs about $10,000 on average, but can range from $3,100 to $15,400.

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.