Reznor Tube Heaters vs. Unit Heaters: Which Heating System Is Right For Your Calgary Facility?
Choosing between tube heaters and unit heaters is one of the most important decisions you’ll make for your facility’s comfort and energy efficiency.
This guide shows you exactly when each system excels, their real costs, and how to know which is perfect for your situation.
This guide shows you exactly when each system excels, their real costs, and how to know which is perfect for your situation.
Reznor Unit Heaters Explained
How Unit Heaters Work
Reznor unit heaters use forced air to distribute heat. A powerful fan blows hot air from the heating chamber directly into your facility.
The Process:
The Process:
- Cold air drawn through return (or outside)
- Air passes through heating element (warm)
- Fan forces warm air into facility
- Heat distributes throughout space
- System cycles based on thermostat
Technology & Efficiency
Heat Source Options:
- Gas-fired (most common, 85-95% efficient)
- Electric resistance (100% efficient but expensive to operate)
- Hot water/steam (used with boiler systems)
- EC motors (electronically commutated): Quieter, more efficient
- Standard motors: Adequate, less expensive
- Variable speed: More control, better efficiency
Best Applications for Unit Heaters
Perfect For:
- Medium-sized spaces (2,000-8,000 sq ft)
- 12-20 foot ceilings
- Spaces needing targeted heating
- Facilities where floor-level heat isn’t critical
- Areas with good insulation
- Facilities with limited ceiling space
- Workshops and garages
- Small retail shops
- Office/administrative buildings
- Production areas with machinery generating heat
- Spaces where air movement is acceptable
- Very large spaces (heat doesn’t reach far)
- High-bay warehouses (heat rises above work area)
- Facilities needing comfort heating (air movement can be uncomfortable)
- Areas with sensitive products
- Where noise is an issue
Unit Heater Advantages
- Lower installation cost: Simpler installation, less ductwork
- Quick heating: Forced air heats space rapidly
- Compact: Smaller footprint than tube systems
- Easy maintenance: Accessible components
- Good temperature control: Precise thermostat response
- Works everywhere: Suitable for most facility types
- Proven technology: Established, familiar systems
Unit Heater Disadvantages
- Air movement: Some facilities find fans intrusive
- Higher noise: Fan operation can be loud
- Uneven heat distribution: Heat concentrates near unit
- Inadequate for high ceilings: Heat rises, wastes energy
- Vulnerable to drafts: Air movement can create cold spots
- Less efficient for large spaces: More units needed for 10,000+ sq ft
- Temperature stratification: Hot air rises, cold settles below
Unit Heater Cost Range
Equipment Cost:
- Small unit (20,000 BTU): $2,000-3,500
- Medium unit (40,000 BTU): $3,500-5,500
- Large unit (75,000 BTU): $5,000-8,000
- Simple installation: $1,000-2,000
- Complex with ductwork: $3,000-5,000
- Multiple units: $2,000-4,000 per additional unit
- Single large unit: $6,500-10,000
- Two medium units: $8,000-13,000
Reznor Tube Heaters Explained
How Tube Heaters Work
Reznor tube heaters (also called radiant tube heaters) use infrared heat. Instead of blowing hot air, they emit radiant energy that heats objects and people directly.
The Process:
The Process:
- Gas burns inside long tubes running across ceiling
- Heat radiates downward as infrared energy
- Objects and people absorb infrared heat
- Minimal air movement in space
- Surfaces warm, comfort maintained
Technology & Efficiency
Heat Source:
- Natural gas (most common)
- Propane available
- Electric versions exist but less common
- Convection (unit heaters): Heats air → air warms you → indirect
- Radiation (tube heaters): Infrared energy warms you directly → immediate
Best Applications for Tube Heaters
Perfect For:
- Large open spaces (8,000-40,000 sq ft)
- 20-60 foot ceilings
- Warehouses and distribution centers
- Manufacturing floors with high ceilings
- Spaces where comfort is priority
- Facilities with sensitive products
- Spaces where air movement is undesirable
- Airplane hangars
- Industrial facilities
- Large workshops
- Loading docks
- Agricultural buildings
- Spaces with high infiltration (doors opening frequently)
- Small rooms (heat waste)
- Facilities with obstacles blocking radiation
- Areas needing quick heating response
- Low-ceiling spaces (mounted too high)
- Systems needing frequent thermostat changes
Tube Heater Advantages
- Large area coverage: Single tube can heat 2,000+ sq ft
- Invisible heating: Infrared is not visible
- No air movement: Quiet, no fans, no drafts
- Comfort: Feels like radiant floor heat
- Efficiency at height: Works well with high ceilings
- Flexibility: Can cover odd-shaped spaces
- Fewer units needed: One system for large space
- Lower operating noise: No fans
- Energy efficient: No waste heating overhead
- Worker comfort: Radiant heat feels natural
Tube Heater Disadvantages
- Higher installation cost: Requires tube routing, complex mounting
- Slower startup: Takes longer to warm space
- Requires clear radiation path: Obstacles block heat
- Cannot move products in path: Permanent installation
- Complex controls: Needs specialized thermostats
- Professional installation mandatory: Not DIY-friendly
- Maintenance complexity: More expensive repairs
- Space planning: Tubes must be positioned correctly
Tube Heater Cost Range
Equipment Cost:
- Single 60,000 BTU tube: $3,500-5,500
- Single 100,000 BTU tube: $5,000-7,500
- Multiple tube system: $8,000-15,000+
- Structural mounting: $2,000-4,000
- Gas line installation: $1,000-3,000
- Venting and controls: $1,500-2,500
- Ductwork (if needed): $2,000-5,000
- Single large tube: $9,500-15,000
- Multiple tubes with controls: $15,000-25,000
Direct Comparison: Tube Heaters vs Unit Heaters
Feature | Reznor Unit Heater | Reznor Tube Heater |
Initial Installation Cost (8,000 sq ft) | $8,000-13,000 | $12,000-20,000 |
Heating Method | Forced air (convection) | Radiant (infrared) |
Operating Noise Level | Moderate (fan) | Very quiet (no fan) |
Heat Distribution | Concentrated near unit | Distributed over large area |
Speed of Heating | Fast (5-10 minutes) | Medium (15-20 minutes) |
Comfort Level | Adequate (feels like forced air) | Superior (like floor heating) |
Ceiling Height Efficiency | Good up to 15 feet | Excellent up to 60 feet |
Space Coverage | 2,000-6,000 sq ft per unit | 6,000-12,000 sq ft per tube |
Air Movement | High (can be uncomfortable) | Minimal (quiet operation) |
Maintenance Cost | $300-500/year | $400-700/year |
Operating Cost (per sq ft) | $1.50-2.50/sq ft/year | $1.25-2.00/sq ft/year |
Installation Complexity | Moderate (mounting, ductwork) | High (structural, complex routing) |
Best Facility Type | Medium spaces, workshops | Large warehouses, open spaces |
Lifespan | 15-18 years | 15-20 years |
Thermostat Response | Immediate | Gradual |
Works with Obstacles | Limited (air blocked) | Poor (radiation blocked) |
Detailed Cost Analysis Examples
Scenario 1: 5,000 sq ft Workshop
Unit Heater Option:
- Equipment: $4,500
- Installation: $2,500
- Total: $7,000
- Operating cost/year: $3,200
- 10-year cost: $39,000
- Equipment: $6,500
- Installation: $4,000
- Total: $10,500
- Operating cost/year: $3,100
- 10-year cost: $41,500
Scenario 2: 10,000 sq ft Warehouse
Unit Heater Option (3 units needed):
- Equipment: $15,000
- Installation: $9,000
- Total: $24,000
- Operating cost/year: $6,400
- 10-year cost: $88,000
- Equipment: $12,000
- Installation: $8,000
- Total: $20,000
- Operating cost/year: $5,800
- 10-year cost: $78,000
Scenario 3: 3,000 sq ft Retail Shop
Unit Heater Option (single):
- Equipment: $3,500
- Installation: $1,500
- Total: $5,000
- Operating cost/year: $2,000
- 10-year cost: $25,000
- Equipment: $4,500
- Installation: $3,500
- Total: $8,000
- Operating cost/year: $1,900
- 10-year cost: $27,000
Which System Is Right For YOUR Facility?
Unit Heater Decision Tree
Choose unit heaters if: ✓ Ceiling height is 12-18 feet ✓ Space is 2,000-6,000 sq ft ✓ You need rapid heating response ✓ Budget is tight ✓ You have obstacles that block heat radiation ✓ You need quick installation ✓ Air movement is acceptable in your facility
Tube Heater Decision Tree
Choose tube heaters if: ✓ Ceiling height is 20+ feet ✓ Space is 8,000+ sq ft ✓ You want quiet operation ✓ Comfort is high priority ✓ You have clear overhead space ✓ Operating efficiency matters most ✓ You’re staying long-term ✓ You want to avoid drafts
Hybrid Approach
Many facilities benefit from combining both:
- Unit heaters in smaller, lower-ceiling spaces (offices, storage)
- Tube heaters in large warehouse areas
- Different zones with different needs
- Maximum flexibility and efficiency
Installation Timeline & Process
Unit Heater Installation
- Duration: 1-2 days
- Disruption: Moderate (mounting, electrical)
- Expertise needed: HVAC technician
- Permits required: Usually not (check local code)
- Mount bracket/frame
- Install heating unit
- Connect gas lines (if gas)
- Connect electrical
- Install thermostat
- Test and commission
Tube Heater Installation
- Duration: 3-5 days
- Disruption: Moderate (structural work)
- Expertise needed: Advanced HVAC technician
- Permits required: Usually required (structural additions)
- Plan tube routing (ceiling layout)
- Install structural supports
- Route tubes along ceiling
- Connect gas supply
- Install venting system
- Install control system
- Thermostat setup
- Commissioning and testing
Maintenance Comparison
Unit Heater Maintenance
- Annual cost: $300-500
- Filter replacement: 1-3 times/year
- Professional service: Twice/year recommended
- Common issues: Filter clogs, motor bearing noise
- Repairs: $200-800 typical cost
Tube Heater Maintenance
- Annual cost: $400-700
- No filters: Eliminates filter expenses
- Professional service: Once/year sufficient
- Common issues: Heat exchanger scale buildup, thermostat calibration
- Repairs: $300-1,200 typical cost
Energy Efficiency Comparison
Operating Costs Per Square Foot Per Year
Unit Heaters (Forced Air):
- Small facility (2,000 sq ft): $1.80/sq ft = $3,600/year
- Medium facility (5,000 sq ft): $1.60/sq ft = $8,000/year
- Large facility (10,000 sq ft): $1.80/sq ft = $18,000/year
- Small facility (2,000 sq ft): $2.00/sq ft = $4,000/year (not ideal for small)
- Medium facility (5,000 sq ft): $1.50/sq ft = $7,500/year
- Large facility (10,000 sq ft): $1.40/sq ft = $14,000/year
Related Reznor Articles
Get Professional Guidance
Not sure which system is right for you?
Our certified technicians will:
- Assess your facility
- Analyze ceiling height and space
- Calculate realistic costs
- Show energy savings comparisons
- Recommend the best option
- Explain long-term value
FAQ: Reznor Tube vs Unit Heaters
Q: Which system heats faster?
Unit heaters heat faster (5-10 minutes). Tube heaters are gradual (15-20 minutes). For comfort, the gradual warm-up is actually preferred.
Q: Which is cheaper to install?
Unit heaters have lower installation cost ($1,500-2,500 vs $4,000-8,000 for tubes). But total cost depends on facility size.
Q: Can I use both systems?
Yes! Many facilities combine unit heaters in some areas and tube heaters in large spaces. This provides optimal efficiency throughout.
Q: Which requires more maintenance?
Unit heaters need more frequent filter changes. Tube heaters have fewer moving parts but need scale removal in hard water areas. Overall costs are similar.
Q: Which is quieter?
Tube heaters are significantly quieter (no fans). If noise is a concern, tube heaters are better.
Q: What if I have obstacles blocking radiation?
Unit heaters work better if radiation is blocked. Tube heaters need clear paths above work areas.