Lochinvar L-KHB199N Condensing Boiler 185000 Btu/h Floor Mount

Product Description

The LOCHINVAR L-KHB199N is a floor-mount condensing hydronic boiler designed for residential and light commercial heating applications. Fueled by natural gas, it delivers 185,000 BTU/h output from a 199,000 BTU/h input rating, achieving 95% thermal efficiency. The unit uses electronic ignition and a direct-vent configuration, drawing combustion air from outside and expelling flue gases through a dedicated vent system. Licensed HVAC technicians and hydronic heating contractors are the primary installers. The condensing heat exchanger design extracts additional heat from flue gases, keeping efficiency high across a wide range of firing rates.

The L-KHB199N is suited for forced hot water (hydronic) heating systems in residential and light commercial buildings. Its floor-mount configuration fits mechanical rooms where wall space is limited or structural wall support is unavailable. The 3-inch vent connection accepts stainless steel, PVC, CPVC, or polypropylene vent materials, giving installers flexibility when routing exhaust and combustion-air intake through the structure. An IBR rating of 161,000 BTU/h and a DOE heating capacity of 185,000 BTU/h confirm real-world output performance under standardized test conditions.

Key Features

• 95% thermal efficiency condensing operation reduces fuel consumption versus standard-efficiency boilers
• 185,000 BTU/h output (199,000 BTU/h input) for substantial residential or light commercial heating loads
• Electronic ignition eliminates standing pilot, improving reliability and efficiency
• Direct-vent design isolates combustion air from conditioned space, meeting tight-construction requirements
• 3-inch vent connection compatible with stainless steel, PVC, CPVC, and polypropylene vent materials
• Floor-mount configuration suits mechanical rooms where wall mounting is not practical

Compatibility

Designed as an OEM-style floor-mount condensing boiler for hydronic heating systems requiring up to 185,000 BTU/h output on natural gas.

Installation Notes

Installation must be performed by a licensed HVAC or hydronic heating contractor in accordance with local mechanical codes and the manufacturer's installation manual. Shut off the gas supply and disconnect electrical power before making any connections or performing service. Vent system material selection must comply with the boiler's listed vent categories and local building codes; use only approved stainless steel, PVC, CPVC, or polypropylene vent pipe rated for condensing appliances. Water connection is 1-1/4 inches and gas supply connection is 1/2 inch — verify supply pressure and pipe sizing meet the manufacturer's requirements before startup.