Ultra Flexible Tankless Technology. As a plumbing pro, you’re not just in the field, you’re on the clock... so every minute matters. That's why our new Adapt™ tankless water heater conforms to your exact needs with 2 ̋ or 3 ̋ venting, ½” or ¾” gas line, NG or LP hookup, and versatile indoor/outdoor installation. Less Inventory. Fewer Trips. More Savings.