Hybrid Water Heating Systems

The RINNAI CHS199100CUIN is a commercial-grade hybrid tankless water heater in the H-Series Demand Duo line, designed for facilities that require continuous, on-demand hot water with built-in redundancy. Running on natural gas, it delivers a maximum output of 199,000 BTU/h and a minimum modulation down to 15,000 BTU/h, giving installers a wide firing range to match varying load demands.

The Rinnai CHS199100HiN Demand Duo H-Series is a hybrid water heating system designed for indoor use. It combines a 119-gallon tank with a 199,000 BTU tankless unit, offering a reliable hot water supply with high performance and efficiency.

The Rinnai CHS19980RECIN is a water heater designed for performance and reliability. This model is part of the R-Series and is suitable for residential applications.

Rinnai CHS19980RIN is a Demand Duo hybrid commercial water heater that pairs a 119-gallon storage tank with a 199,000 BTU tankless module for natural gas operation, delivering high first-hour output for peak demand. The unit vents to a 6 in. B-Vent and includes a Duo Smart digital controller with recirculation control and Wi-Fi capability.