The CVR100W is part of the KSS series of water heaters from Rheem. It is a condensing tankless water heater that is designed for continuous hot water production and efficient energy usage. It features a compact design to fit in tight spaces, a high-efficiency stainless steel heat exchanger and a low-NOx burner system to reduce emissions. This model uses natural or propane gas and delivers up to 9.8 gallons of hot water per minute. It is Energy Star Certified and comes with a 10-year limited warranty on the heat exchanger and a 1-year limited warranty on parts.