A heating device or appliance that doesn't have a flue (pipe) to carry away smoke or gases, usually ventless.
Formed by combining 'flue' (a duct for smoke or gas) with the suffix '-less' (without). This is a modern term describing gas heaters designed to operate without traditional chimneys.
Flueless gas heaters became popular in the 1970s because they're energy-efficient, but scientists discovered they can produce harmful nitrogen dioxide indoors—a reminder that not everything 'modern' is automatically better!
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