At Stelter & Brinck, with over 100 years of expertise in the process heat industry, we’ve helped countless facilities modernize aging air heaters to improve efficiency, reduce downtime, lower operating costs, and meet today’s stricter emissions and safety standards. In this post, we outline clear warning signs that your current direct or indirect fired air heater may need attention and highlight how S&B’s custom solutions can help.

Signs It’s Time to Upgrade Your Air Heater

Watch for these common indicators that your existing air heater is costing you more than it should:

• Increased Fuel Consumption & Higher Operating Costs Older units often run with poor efficiency due to degraded heat exchangers (in indirect systems), worn burners, or outdated controls. If your fuel bills have risen without increased production, it’s a strong signal.
• Frequent Downtime or Unplanned Shutdowns Repeated burner faults, control failures, or safety trips point to aging components. One customer reported over 70% reduction in downtime after S&B upgrades.
• Inconsistent Temperature Control or Reduced Performance Difficulty maintaining target outlet temperatures, longer heat-up times, or uneven heating often result from fouled exchangers, low turndown capability, or outdated combustion systems.
• Rising Maintenance Expenses If you’re frequently replacing parts, performing emergency repairs, or scheduling more service visits, the long-term costs of keeping an old system running usually exceed the investment in a new one.
• Emissions or Compliance Issues Older heaters may no longer meet current low-NOx, CO, or environmental regulations. Upgrading to modern low-emission burners and controls can help you stay compliant.
• Safety or Control System Concerns Outdated flame safety systems, lack of modern PLC/DCS integration, or failing safety interlocks increase risk and may violate insurance or code requirements (FM, NFPA, etc.).
• Limited Capacity for Process Changes If your production needs have grown (higher airflow, different temperatures, new fuels, or tighter tolerances), your current heater may no longer be adequate.

S&B Upgrade & Replacement Solutions

Stelter & Brinck offers flexible paths forward — from targeted retrofits to complete system replacements.

Key Upgrade Options Include:

• Complete Custom Air Heater Replacements — Direct Fired (Duct Style, Gun Style, or Packaged) or Indirect Fired (IAH-R, IAH-NR, IAH-ST) units built to fit your exact footprint, process requirements, and infrastructure.
• Burner & Combustion Upgrades — Modern low-emission burners with higher turndown, better efficiency, and advanced flame safety (e.g., Honeywell SLATE or similar systems).
• Control System Modernization — Integration of PLC/DCS compatibility, touch-screen interfaces, remote monitoring, and improved PID temperature control.
• Heat Recovery & Efficiency Enhancements — Combustion air preheat systems, economizers, and secondary heat recovery to boost overall thermal efficiency.
• Retrofits & Component Upgrades — Heat exchanger replacements (for indirect heaters), upgraded insulation, stainless steel construction, or conversion between direct and indirect configurations when appropriate.
• Packaged Skid-Mounted Solutions — For faster installation and minimal disruption.

Every S&B air heater is fully test-fired in our facility before shipment, arrives ready for installation, and is supported by our expert field service team for start-up, commissioning, and ongoing maintenance.

Real Customer Results

Customers consistently see major improvements after partnering with S&B:

• “Because of S&B’s upgrades, our equipment is more reliable and we have considerably less downtime; S&B’s upgrades have decreased our shutdowns and downtime by over 70%!”
• “Using Stelter & Brinck’s Scheduled Burner Maintenance Program… lengthens the life of our equipment and reduces our operating costs.”

The Stelter & Brinck Advantage

We don’t just sell new equipment — we also engineer upgrades that deliver measurable gains in efficiency, reliability, and uptime. Our team reviews your existing installation, process data, and goals to recommend the most cost-effective path forward.

Whether you need a full replacement or a targeted modernization, our custom approach ensures a seamless transition with minimal production interruption.

Ready to evaluate your current air heater system? Contact us today at (513) 367-9300 or visit stelterbrinck.com/contact-us. Our engineers will assess your setup and provide clear recommendations tailored to your operation.

Have questions about upgrading your air heater, or want to share your own experience? Comment below or reach out directly — we answer every inquiry personally.