Direct Vent Gas Heaters

Direct vent means the heater draws combustion air from outside the building and exhausts all combustion gases directly to the outdoors through a sealed venting system. This design ensures no combustion byproducts enter the heated space, improving indoor air quality and safety. Combustion Research systems are available in power-vented and vacuum-fired direct vent configurations.

Direct vent propane radiant infrared tube heaters from Combustion Research deliver 30–50% energy savings compared to conventional forced-air systems. Their S.E.C.-designed emitter tubing maximizes radiant heat output, and ceiling-mounted installation ensures heat is directed precisely where it is needed without energy losses from air circulation or duct leakage.

Our product lineup covers 30,000 BTU/hr up to 250,000 BTU/hr, accommodating spaces from small residential garages and pole barns to large industrial warehouses exceeding one million square feet. Single-stage, two-stage, and dual input modulating options allow precise capacity matching for any application.

All Combustion Research direct vent gas heaters are available for use with Natural Gas (NG) or Propane Gas (LP). This dual-fuel compatibility makes them suitable for a wide range of facilities, including those in rural areas where natural gas supply is unavailable and propane is the primary energy source.

Power-vented systems use a blower to push combustion gases through the radiant tube and out a vent. Vacuum-fired systems use an exhauster fan at the end of the tube to pull combustion gases through, creating a negative pressure for highly efficient heat transfer. Both are direct vent designs; vacuum-fired systems are often preferred for larger, custom-designed installations requiring maximum coverage.

Combustion Research provides a 10-year warranty on radiant tubes for internally created corrosion. The Omega II 9K Series also includes a 3-year warranty on ignition controls and electrical components. All units are 100% factory tested before shipment, ensuring reliable performance from the first day of installation.