Ask This Old House TV

Plumbing and heating expert Richard Trethewey and host Kevin O'Connor replace an old tank-type water heater with a new, energy-efficient tankless unit fueled by propane. Then Richard and Kevin, along with landscaping contractor Roger Cook and general contractor Tom Silva ask, "What is it?" Roger helps a homeowner level his sagging concrete walkway using a method called mudjacking, and Tom shares a viewer tip for removing hammer dents from a piece of wood.