Ask This Old House plumbing and heating expert Richard Trethewey heads to Milwaukee to install an instantaneous water heater. SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Cost: $2000 Skill Level: Expert Tools List for Installing a Tankless Water Heater: Pipe wrench [https://amzn.to/30C1bcN] Drill [https://amzn.to/2xMFxWQ] Hole saw [https://amzn.to/2JuwyjA] Shopping List: 1” gas line and fittings [https://amzn.to/2XN1e3E] 4”…