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Boiling water produces a lot of waste heat. I'm inclined to believe an electric blanket is pretty good comparatively.

Of course my house is all electric, so there are no electric vs. natural gas conversions to make.

Wasted heat? All the wasted heat goes into the air, warming up the room.

The room being the kitchen, which is not the room you're trying to heat up as you prepare for bed.

The egress path of that heat will tend to be dissipation throughout the habitable area, modulo circulation. One factor I've noted in room heating is how much heat tends to rise toward the ceiling. A vertically-oriented fan (need not be a ceiling fan) will help achieve a good blend of temperature floor-to-ceiling.

Air flows between rooms / through doorways can also be surprisingly stubborn, but it does happen.

The specifics will depend on the size of the interior space, position of the kitchen, access to exterior walls, etc.

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