Using Rinnai Concentric Venting saves you time. Rinnai's Drue Kidd explains how concentric venting can save you time when installing one of our tankless water heaters. Doing a single wall penetration means half the cutting, sealing, and measuring. And the pre-measured, approved termination means less planning and layout time. At Rinnai, we understand that your time is your most valuable asset. That’s why we design our products to help you get the job done faster and more efficiently. Drue Kidd i