A chimney liner isn’t required for an outdoor fireplace; you don’t technically need one if the masonry chimney uses the proper dimensions and is built to code. However, a chimney liner does serve as a protective coating for the flue. Adding a liner could improve performance, safety, and durability. In short, while not necessary, it wouldn’t hurt.

You should use an angled brush to first paint the mortar lines, then go in with a high-density roller to evenly paint the bricks one at a time. You can also use a flat paintbrush to paint individual bricks, but a roller is faster and easier to use thanks to its longer handle and wider surface area for coating the bricks. To finish, go in with the paint brush for edges or hard-to-reach areas.

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.

Deciding whether to buy a prebuilt fireplace kit or build one from scratch comes down to aesthetics, available space, and budget. Many homeowners like the convenience and lower cost of prebuilt options—around $1,500—versus the involved planning and construction of a larger fireplace. Another bonus: you can usually move prebuilt units. Custom projects are more common when homeowners have access to a larger budget and more area in the yard to place the fireplace.