LS25 Commercial Separated Combustion Unit Heater

LS25 Commercial Separated Combustion Unit Heater

Increased Application Flexibility

Description

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.

Product Features

  • Heating capacities from 30,000-400,000 BTU/h.
  • Designed for use in applications where the indoor environment may contain airborne contaminants, VOC’s or dust .
  • Ideal for hard-to-heat applications where excessive humidity or negative pressure is a concern.
  • Dimpled Tubular Heat Exchanger improves efficiency (82%) and increases durability.
  • The hinged door allows easy access to components.
  • Optional stainless steel heat exchangers provide superiror resistance to corrosion and oxidation.
  • Sidewall venting eliminates roof penetrations.
  • Self-diagnostic board with LED display improves troubleshooting efficiency and accuracy.

Product Documentation

Image

STOCK UP & SAVE

Buy more, save more. Now through December 31, get up to 15% off qualifying in-sock unit heaters.

  • Get 5% off when you spend $4,999

  • Get 10% off when you spend $6,999

  • Get 15% off when you spend $9,999 or more

Image

Subscribe to Stay Connected with Lennox Commercial

Commercial Connect is our monthly newsletter that provides news on our latest products, services and innovations in commercial comfort. Fill out the form to sign up to receive industry updates, product releases, promotions, and announcements from Lennox Commercial.

New on the Blog: Strategos® Rooftop Unit Named ACHR NEWS 2026 Commercial Product of the Year

Quick Links