Many homeowners use wood as an additional (but not primary) heat source.

Sometimes this may not be enough, and you may have to supply additional heat to ward off the cold.

It's only after the last traces of ice are melted that additional heat can then warm up the water.

Any additional heat added to the system will cause the conversion of the water to steam.

At that time, additional heat will raise the temperature of the melt-water.

This may result in significant reduction of smoke hazards while also providing additional heat from the process.

The best results are obtained with additional heat such as a greenhouse.

Not so much if the additional heat the Earth is going to retain were all spread out evenly, of course, but that's just the point.

At that point, the collapse creates a great deal of additional heat in the core.

In the heater, an amount of additional heat is added.