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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.

Fireplaces can theoretically help you save on heating bills if you lower the temperature throughout the rest of your home and heat only a single room that you occupy using the fireplace. However, in most cases, homeowners won’t save any money on heating bills. Gas and electric fireplace inserts could actually lead to a spike in your respective energy bills if you use them frequently, and if you don’t keep up with chimney maintenance and repairs, your traditional masonry fireplace could actually be a source of heat loss in the winter.

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.

Deciding when to replace your fireplace depends on its condition and your preferences. Replacements may be necessary if your fireplace shows extensive damage, safety issues, or inefficiency. Signs include deteriorating masonry, cracked firebox panels, or a faulty chimney. Aesthetic reasons, such as outdated design, can also drive replacement. Wanting something more sustainable and energy-efficient is another good reason to replace your old fireplace.