Radiant Tube Heater Sizing Calculator

The right size depends on square footage, ceiling height, insulation, climate, and application. A single Reflect-O-Ray unit can cover 500 sq ft up to over 1,000,000 sq ft in custom-engineered systems, with BTU inputs ranging from 40,000 to 250,000 Btu/hr per heater. Our engineers calculate exact heat loss to recommend the correct model and quantity.

Reflect-O-Ray EDS radiant tube heaters offer high-fire inputs from 40,000 to 250,000 Btu/hr, with low fire on dual-stage models running approximately 30% lower. This wide range allows a single heater series to serve small service bays as well as million-square-foot warehouses when systems are properly sized and configured.

Single-stage heaters operate at one fixed output, cycling on and off to maintain temperature. Dual-stage modulating models, like the 4DI EDS, automatically adjust both gas and air between high and low fire, delivering tighter temperature control and additional energy savings in spaces with variable heating loads or frequent door openings.

Stainless steel burner housings resist corrosion in humid or chemically aggressive environments such as natatoriums, ice arenas, and wash bays exposed to road salt. Powder-coated housings are cost-effective and well-suited to standard warehouses, service garages, and manufacturing floors without heavy corrosive exposure.

The number of heaters depends on total heat loss, ceiling height, and desired temperature rise across the building. Custom-engineered vacuum-fired systems can be configured to cover facilities from 500 sq ft to over 1,000,000 sq ft, using multiple heaters spaced for even, overlapping radiant coverage without cold spots.

Reflect-O-Ray heaters use 3-Try Direct Spark Ignition with 100% safety lockout, electronic flame monitoring, and a pre-purge cycle before ignition. All models are CSA certified to ANSI/CGA standards and 100% factory tested prior to shipment, ensuring reliable, code-compliant operation in industrial environments.