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The phrase 'source of heat' is correct and usable in written English.
You can use it to refer to something that provides or produces heat. For example, "The sun is a natural source of heat for the earth."
Exact(56)
Again, the source of heat was inconsequential.
His only source of heat is a cast-iron stove.
Such emissions are a harmful source of heat.
The windows face the mountains and are a source of heat for the house; a wood-burning stove is another source of heat.
Down at breakfast – dammit – just one table is hogging the fire, the only source of heat.
A shivering group huddled around an incinerator, the campsite's only source of heat.
So there must be another source of heat in the planet.
Similar(4)
The other two ingredients--liquid water and a sufficient source of heat--might also be present.
7. The oil sands operations are the fastest growing source of heat-trapping greenhouse gas in Canada.
By transitioning to safer alternatives now, we can avoid a rapidly growing source of heat-trapping pollution.
Although if one doused the plasticine football in paraffin it might be a short-lived source of heat..
More suggestions(18)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com