True Dual MTSA 2-Stage

True Dual Two-Stage Gas Infra-Red Tube Heaters provide precise air to gas ratios at both the high and low heat stages for optimum efficiency.

Excessive overheating is prevented and a softer, more stable and comfortable environment is maintained. Can save up to 75% in energy costs, and typically 10-15% savings over a single stage tube heater.

2-stage tube heater offering our slip-fit tube connection package.

Two-stage operation with both gas and air modulated for high and low-heat

16 gauge titanium coated aluminized steel, heat-treated, combustion chamber

Corrosion resistant 16 gauge 4” O.D. heat-treated heat exchange

Simple chain mounting

CSA International Design Certified to ANSI/CGA Standards

Mill finish aluminum reflectors

  • 91.7% reflectional efficiency (shape)

Rotatable reflector arrangements from 0° to 30°

Burner fully assembled and tested – ready to hang

Factory installed wave turbulator for high efficiency

Safe, reliable operation

  • Durable direct spark ignition
  • 100% safety shut-off
  • Pre-purge cycle for safety
  • System validation light


  • Recessed Ceiling Kit
  • Side Reflector
  • 90° Elbow with reflector
  • “U”-Bend with reflector
  • Common Vent Couplers
  • Inlet and Exhaust Kits
  • Blower Enclosure
  • Available in stainless steel construction as model SMTS
  • Available with black steel heat exchangers as model MTS

Manifold Operating Pressure
Natural Gas and LP/Propane: 5 inches WC

Minimum Inlet Pressure
Natural Gas: 7 inches WC
LP/Propane: 11 inches WC

Maximum Inlet Pressure
Natural Gas and LP/Propane: 14 inches WC 1/2 inch FPT Gas Inlet

Electrical Rating
120 VAC – 60 Hz – 1 Phase
1.30 max. amp. draw at 138 cfm/free air

10 year limited warranty on Burner Core
10 year limited warranty on All Combustionand Heat Exchanger tubes
3 year limited warranty on All Burner Controls