This Old House plumbing and heating expert Richard Trethewey silences a rattling metal heating unit. (See below for a shopping list and tools.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Shopping List for How to Quiet a Noisy Baseboard Heater: - 2-gallon bucket - emery cloth - lead-free solder and flux - copper couplings - corrugated…