Many ventless options may not require a chimney to exhaust the byproducts of combustion but some gas log sets still use and may require an existing chimney to dissipate the heat generated by burning. ... Most gas log sets require that they be installed into a properly maintained and code compliant chimney system.

Can a gas fire be fitted without a chimney?

Yes, you can have a gas fire without a flue. These rather clever fires can either use an in built catalytic converter to filter any gases. Flueless gas fires are a very interesting option for people with no access to an external wall. Of course, this type of fire needs a gas supply in the room in question.

Do gas fires use chimney?

There will be some minor building work to carry out to fit an electric fire into your home. While a chimney isn't necessary, most electric fire suites will require you to do some drilling or structural work, especially if you need to create a cavity for an inset electric fire.