This Old House plumbing and heating expert Richard Trethewey delivers hot water on demand. (See below for a shopping list and tools.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Shopping List for Install a Hot Water Recirculation Pump: recirculation pump [https://amzn.to/2Loll4Z] 1 5/8-inch screws [https://amzn.to/2N7wysY] Tools for Install a Hot Water Recirculation Pump: mini-hacksaw [https://amzn.to/2NVsmfE] adjustable…