Westport-based Gault Energy & Home Solutions has launched the company’s 2016 “Oldest Boiler” contest. The fifth in 18 years, the contest typically attracts several hundred entries from homeowners across Fairfield County who are eager to upgrade their outdated home heating systems to high-efficiency furnaces and boilers.

The fuel-neutral contest, which is open to all Fairfield County home heating oil, natural gas and propane consumers, runs through Sept. 30.

To enter, homeowners, who need not be Gault customers, must submit a photo of their existing boiler or furnace, along with a completed entry form. Entries may be submitted online at gaultenergy.com/oldestboilercontest or mailed to P.O. Box 2030, Westport, CT 06880.

Throughout the contest, select entries will be posted to the company’s Facebook. The winner will be announced the week of Oct. 10.