LS25

The LS25 Separated Combustion Unit Heaters utilize high‑temperature silicone gaskets to provide a superior seal and leakage rates that are up to 57% lower* than those allowed under ANSI Z83.8. Lennox goes above and beyond to deliver a tight, durable seal because that is the key to unmatched durability and efficiency over the life of a separated combustion product in harsh environments. The LS25 design simplifies installation of the unit by not disturbing any of the factory‑installed seals or requiring messy, field‑applied sealants.

INCREASED APPLICATION FLEXIBILITY

• Separated combustion units offer a robust heating solution for buildings with harsh indoor environments.
• Fresh-air intake can be rotated 180˚ degrees on the 125-400 kBtuh models for increased installation flexibility in retrofit applications, which can reduce the number of piping elbows needed to make venting connections.

• The separated combustion technology enhances overall energy efficiency of the building by eliminating the continued replacement of conditioned air with unconditioned outside air.
• Up to 5% more efficient than standard efficiency direct-fired unit heaters**
• LS25-250 through LS25-400 kBtuh models lower operating costs by efficiently meeting the demands of the space with two stages of heating.

Separated combustion LS25 models use outside air for combustion and are designed for use in applications where the indoor environment may contain airborne contaminants, VOC’s and/or dust that would normally be harmful to the combustion process and components.