Ask This Old House plumbing and heating expert Richard Trethewey helps a homeowner install an indirect water heater onto an existing steam boiler to boost the amount of hot water in the house. SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Time: 5-6 hours Cost: $3000 Skill Level: Difficult Tools List: Hose Water pump Level Propane torch…