Rinnai Demand Duo CHS HCX Hybrid Water System, 199,000 BTU, 119 Gallon Tank

A Rinnai Demand Duo H-Series commercial hybrid water heating system that joins condensing tankless heating with a 119-gallon storage tank, for up to 199,000 BTU of total input. It targets restaurants, hotels, gyms and multi-unit buildings with continuous, high-volume hot water demand.

Stored water covers immediate draws while the tankless side provides continuous recovery, which cuts recovery lag and keeps temperatures steady under peak load compared with tank-only systems. The condensing heater pulls extra heat from combustion gases for better overall thermal efficiency. Advanced hybrid controls help limit downtime and maintain consistent output.

This indoor, natural gas configuration is recirculation capable for faster hot water at fixtures. It runs on 120 V, 60 Hz and carries ENERGY STAR, AHRI, ANSI Z21.10.3 and CSA 4.3 certifications. The system measures 69.60 in. high, 24.10 in. wide and 40.20 in. long, and weighs 450 lb.

Highlights

• Up to 199,000 BTU input with condensing tankless heating

• 119-gallon integrated storage tank

• Tank-plus-tankless design reduces recovery lag at peak demand

• Built-in recirculation capability

• Indoor natural gas configuration, 120 V

• ENERGY STAR, AHRI, ANSI Z21.10.3, CSA 4.3

Specifications

Good to know

• Gas-fired appliance: it must be installed, vented and commissioned by a qualified installer in line with local codes and the manufacturer's installation manual.