Flued gas heaters are unlikely to cause condensation. This is because air pollutants and water vapour are vented outside of the house through a chimney. Unflued gas heaters are more likely to cause condensation. Unflued gas heaters produce CO2, and when combined with water vapour in the air, causes condensation. The condensation cause from unflued gas heaters can produce mould. The mould then grows from the unvented chemicals in the air. While unflued gas heaters cause condensation, flued gas heaters are highly unlikely.

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