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All answers having "Hot spot" as clue:

3 Character Answers:

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SPA

TEA

TUB



4 Character Answers:

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HELL

KILN

OAST

OVEN

SARA



5 Character Answers:

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HADES

LOCUS

SAUNA

SCENE

STOVE



6 Character Answers:

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BOILER

DESERT

SAHARA



7 Character Answers:

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FURNACE

INFERNO

TROPICS



8 Character Answers:

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RADIATOR

WIFIZONE



9 Character Answers:

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FIREPLACE

TINDERBOX



10 Character Answers:

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TORRIDZONE