What is a Cold Water Sandwich? Having a problem with your tankless water heater turning cold after a few minutes? Find out what might be causing the problem here with Alan O’Neil from Abacus Plumbing. Your browser does not support the audio element. https://media.blubrry.com/homeshow/p/homeshowradio.com/wp-content/uploads/2014/06/EE-ABA-050414.mp3Podcast: Play in new windowMore HomeShow Videos:What’s your thought on a foam insulation sandwich…Do I need a new water heater if my hot water turns…What's That Plumbing Smell?Why does my tankless water heater run hot and cold?Why does my tankless water heater run hot and cold?