Frequently Asked Total Heat System Questions

QWhat is a direct fired heater?

ADirect-fired heating refers to heating equipment that burns gas directly into the fresh air stream. The result is a 100% combustion efficient process with no wasted energy and no flues to vent. All of the available BTUs are safely introduced into the heated space.

QAren't all direct fired gas heaters the same for space heating?

ANo, every application is unique and should be evaluated as such. High temperature cycling systems that utilize 100% fresh air, for instance, do not address minimum ventilation requirements set forth by ASHRAE standard 62.1, International Mechanical Code and the ACGIH handbook.

QWhy are direct fired gas heaters considered a superior technology over other methods?

ADirect fired heating is a 92% thermally efficient process, compared to a 70-80% thermally efficient indirect fired system that vents flue gases to the atmosphere. Direct fired heating is environmentally clean and is tested to the highest current standards for safe combustion rates, under ANSI and CSA guidelines. Direct fired heating equipment is widely considered a Green product in the industry today, exceeding ASHRAE 90.1 requirements for equipment efficiency. Additional benefits include lower initial cost and installation as compared to other methods.

QWhy is the total heat approach with direct fired heating preferred over typical indirect fired methods such as air rotation or unit heaters?

ADirect fired gas products provide the most favorable industrial space heating in most circumstances. Primary benefits include initial cost, operating cost, indoor air quality, infiltration control, de-stratification, summer ventilation and usable space consumption.

QHow do 100% outside air high temperature cycling systems compare with the total heat system?


  • The Total Heat System utilizes higher CFM volumes for better air distribution. It also incorporates recirculation, using less cold fresh air and reducing total gas consumption, thus saving energy costs. By recirculating the air, the system is able to turnover internal heat gain.
  • Although the high temp cycling system utilizes 100% fresh air when in operation, it is just that: a cycling system. When cycled off, the system is not designed to control infiltration.
  • Unlike the cycling system, the Total Heat System continuously introduces a minimal amount of fresh air to:
    • Control infiltration and drafts that may exist due to openings in the building
    • Create a positive space pressure to control stratification and maintain constant thermal comfort
    • Comply to International Mechanical Code, ASHRAE Ventilation Standard 62.1 & ACGIH Handbook
  • The Total Heat System adequately meets summer ventilation rates by introducing more fresh air on demand.

QDoes RuppAir offer sizing assistance?

AAbsolutely. With over 50 years of experience, you can count on us to deliver the best system available. The end result with the RuppAir approach is a sustainable solution, utility savings, a comfortable work environment and increased productivity. By working with your local sales office to utilize their tools and years of expertise, you can rest assured that your expectations will be exceeded.

QDoes the total heat system qualify for leed projects or epact federal tax deductions?

ARuppAir's Total Heat System can help you qualify for numerous LEED credits depending on the application, complying to ASHRAE Standards 62.1-2007 and ASHRAE Standard 90.1-2004. This is a requirement for LEED certified buildings.

With the involvement of an independent engineered tax services firm to provide the IRS energy certification, we can work with you to potentially obtain EPAct tax deductions of up to $.60/sf for commercial/industrial buildings. This can be increased to $1.20 or $1.80/sf when paired with energy efficient lighting.