The Rheem Professional Prestige RTGH-84DVLN natural gas wall-hung tankless water heater is an ideal solution for households requiring continuous hot water for one fixture; the unit produces a continuous 8.4 gallons per minute at a 35 Degree temperature rise or 4.6 gallons per minute at a 67 Degree temperature rise.  The RTGH series operates at 40% greater efficiency compared to a standard tank-type water heater.  The tankless design delivers hot water when you need it eliminating the additional cost of maintaining a tank of hot water.