Rinnai added a 40-gallon water tank to a tankless water heater to create a product designed for emergency replacements or for homeowners wanting to add to their hot-water supply without altering their current setup. The Hybrid Tank-Tankless Water Heater installs like a tanked product, requiring a ½-inch gas line, and works with a 4-inch B-vent or a common vent and furnace. Rinnai, 800.621.9419, rinnai.us
