"especially in colder months when any heat from the flames that escapes around the side of the kettle will warm the room, reducing the burden on the central hea

"especially in colder months when any heat from the flames that escapes around the side of the kettle will warm the room, reducing the burden on the central heating system" this article is nonsense. Excess heat from an electric heater is going to warm the ambient air just the same as a gas burner will.