Yes, HEATS is a Scrabble word!

Letter values in Scrabble US: H 4, E 1, A 1, T 1, S 1.

Is it a valid word?

HEATS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a form of energy that is transferred by a difference in temperature
the presence of heat
the sensation caused by heat energy
the trait of being intensely emotional
applies to nonhuman mammals: a state or period of heightened sexual arousal and activity
a preliminary race in which the winner advances to a more important race
utility to warm a building

Also: heat energy, high temperature, heating system, heating plant, heat up, stir up, fire up, hot up.