What causes a lot of soot and blue and yellow flames in our gas stove?

Soot usually indicates a dirty stove. When this is accompanied by large flames it implies you’re burning lots of debris in your gas stove. Stoves with soot typically experience considerable heat loss.

Since the soot acts as an insulator, there is less room for combustion and natural venting, resulting in a smothered flame and a dramatic drop in heating efficiency. Scheduled cleaning and maintenance of your gas stove will minimize soot.