Gas-powered Tankless Water Heaters. Gas-powered systems are fuelled by propane or natural gas and heat the water with a burner. A tankless gas water heater needs a gas line to the water heater, and the unit must be vented to the outside. If tankless gas is replacing a gas tank-type water heater, typically it requires a larger gas line.. Resources. Enjoy hot water when you need it with the GSW Condensing 199,000 BTU Natural Gas Tankless Water Heater. Saves on energy and utility costs by heating water when needed. Dual heat exchanger design. Can be vented with 3\" (7.6 cm) or 4\" (10.2 cm) ULC S636 PVC, CPVC, or polypropylene or Cat. IV stainless steel pipe.

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Navien Premium Efficiency condensing tankless water heaters are the #1 selling high efficiency condensing tankless water heaters in North America. The NPE-2 series offers ultra-high efficiency up to 0.96 UEF to keep your utility bills low, endless hot water, and exclusive ComfortFlow® technology with a built-in recirculation pump and buffer tank.. Features. Rheem's electric tankless water heater is perfect for large homes and multiple applications. It can handle dishwashers, showers, faucets, and more all running at once without losing heat or taking up your time. In less than a minute, you can enjoy hot water even at the furthest end of your home.