Ask This Old House plumbing and heating expert Richard Trethewey finds a solution for a water heater that recently started leaking. SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Time: 3-4 hours Cost: $100 Skill Level: Moderate Tools List for Repairing a Leaky Water Heater: Bucket Flathead screwdriver Pipe cutter Shopping List: Expansion tank certified for potable…