My mother, Mrs. Myrtle Brown, (formerly a B(r)anton of St. Jones, a settlement whose inhabitants all moved to Winterton in the 1930’s) uses the word hot instead of heat in such cases as:
I’ll hot some soup for dinner.
I hotted the gravey.
The water is hotting on the stove.
This does not mean that something is being cooked or baked, merely being warmed …
N.B. I feel sure that this usage only applies to food or something related, i.e. it would not be used in referring to heating a house or a room.
Source: Clifford Brown, for a Folklore course at MUN, 1971