Rinnai CHS HCX Vertical Hybrid System, 398,000 BTU, 119 Gal, Natural Gas

A vertical Demand Duo H-Series hybrid from Rinnai that feeds a standard 119-gallon tank with two 199,000 BTU condensing tankless engines. It is designed for restaurants, hotels, offices, spas and healthcare buildings where running short of hot water at peak times is not an option.

Combined input reaches 398,000 BTU, with a 15,000 BTU minimum, and first-hour delivery runs up to 551 gallons at a 100°F rise. Two independent engines give redundancy: if one is down for service, the other keeps heating. Because the engines do the heating, the tank is spared thermal stress. Efficiency is rated at 0.98 UEF, the CX199 engines are 97% thermally efficient, and the system is ENERGY STAR certified and Ultra Low NOx, SCAQMD compliant.

The DuoSmart digital controller handles temperature and recirculation with no aquastat, and Wi-Fi supports remote monitoring. A gas swivel flex line with full 360-degree rotation, a gas dirt leg fitted at the factory, an accessible electrical connection and a preassembled condensate drain all reduce installation work. The vertical standard-tank layout keeps the footprint small, and total weight can come in about 37% under a similar high-efficiency tank.

Highlights

• Two 199,000 BTU tankless engines, 398,000 BTU combined

• First-hour delivery up to 551 gal at a 100°F rise

• 0.98 UEF with 97% thermally efficient CX199 engines

• Redundant engines keep hot water flowing if one needs service

• ENERGY STAR certified, Ultra Low NOx and SCAQMD compliant

• DuoSmart control with recirculation and Wi-Fi monitoring

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.