Potential answers for "Part of an old heating system"

⭐⭐⭐⭐ BOILER
⭐⭐⭐ DUCT
⭐⭐⭐ RADIATOR
⭐⭐⭐ TRANE
⭐⭐⭐ DUCTS
⭐⭐⭐ OILTANK
⭐⭐⭐ FORCEDAIR
⭐⭐⭐ STEAMPIPE

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