Related Clues:

• Part of a heating system
• Fireplace alternative
• Heat provider
• Steam source
• Auto part
• Roscoe or gat
• Auto device
• Fastball, in dugout slang
• Fire a gun
• Punk's piece
• Radiator, e.g.
• Furnace, e.g.
• Heating device
• Home heater
• Fastball, in slang