Rinnai TRX Two-Unit Sensei CX Tankless Rack System, 398,000 BTU, Natural Gas

The Rinnai TRX02CXIN is a pre-assembled, wall-hanging rack that joins two Sensei CX condensing tankless water heaters into one commercial system. With 398,000 BTU of total input and up to 22 GPM, it suits restaurants, hotels, gyms and multi-unit buildings on natural gas.

Each CX199i unit is rated at 97% thermal efficiency with a UEF of up to 0.98, and the burners modulate electronically to hold a stable outlet temperature through changing loads. Built-in cascade logic shares runtime between the two heaters with no external controller, and if one is taken offline for service the other keeps supplying hot water. Built-in safeguards cover flame failure, overheating and a blocked flue, plus automatic protection against freezing.

The frame is powder-coated aluminum for corrosion resistance, the water header uses rigid copper piping, and Schedule-40 steel forms the gas trunk. This configuration is for indoor, wall-mounted installation, with 1 in. threaded connections and a 120 V supply drawing 8 A. The assembled rack measures 37 in. high, 39 in. long and 13 in. wide.

Highlights

• Two Sensei CX199i condensing units, 398,000 BTU total

• Up to 22 GPM combined hot water output

• 97% thermal efficiency, UEF up to 0.98

• Integrated cascade control with unit redundancy

• Powder-coated aluminum frame, copper water header, steel gas trunk

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.