The Hydra Smart Residential Tankless Water Heater produces endless hot water with advanced temperature control. This advanced modulating water heater has up to a 0.98 energy factor and a 10 to 1 turndown ratio. The Department of Energy has estimated that tankless systems can save up to 35% on your energy costs.  This Hydra Smart wall hung unit has a durable high grade stainless steel heat exchanger. It also has an eco-friendly and low NOx combustion system and is equipped with highly innovative gas leak detector.