The Bunsen burner has a wide heavy base
The Bunsen Burner has a wide heavy base to make sure the chimney remains stable. It is there to provide the Bunsen Burner with support so that it does not topple over and remains standing. If the Bunsen Burner had a Thin light base, it would topple over as it will not have balance, because the base will not be strong enough to keep the chimney upright.