Garage Heater Size Calculator: What Size Heater Do I Need?
Calculate the right garage heater size by entering your garage details below.
What is a Garage Heater?
A garage heater is a heating unit specifically designed to warm garage spaces effectively. Unlike home heating systems, garage heaters are built to handle large, often uninsulated spaces and can provide quick, efficient heating when needed.
Types of Garage Heaters
| Type | Description | Best For |
|---|---|---|
| Electric Forced-Air | Uses electrical resistance heating with fan distribution | Small to medium garages, easy installation |
| Natural Gas/Propane | Burns fuel to generate heat, requires ventilation | Large spaces, cost-effective operation |
| Infrared/Radiant | Heats objects directly rather than air | Spot heating, workshops, quick warmth |
| Portable Units | Mobile heating solutions | Temporary heating needs, flexibility |
Benefits of Garage Heating
Workspace Comfort
- Comfortable working temperature
- Extended usage of garage space
- Protection from cold weather
- Better working conditions
Vehicle Protection
- Easier vehicle starting in winter
- Reduced engine wear
- Protected car batteries
- Prevents freezing of fluids
Property Protection
- Prevents frozen pipes
- Protects stored items
- Reduces moisture issues
- Prevents mold growth
Energy Efficiency
- Zoned heating control
- Programmable options
- Targeted heat distribution
- Reduced energy waste
How to Choose the Right Garage Heater?
Heating Capacity Guidelines
| Garage Size | Recommended BTU Range | Typical Coverage |
|---|---|---|
| Single Car (250-350 sq ft) | 20,000-30,000 BTU | Up to 350 sq ft |
| Two Car (400-600 sq ft) | 35,000-50,000 BTU | Up to 600 sq ft |
| Three Car (650-850 sq ft) | 55,000-75,000 BTU | Up to 850 sq ft |
| Large Shop (900+ sq ft) | 80,000+ BTU | 900+ sq ft |
Important Factors in Garage Heater Selection
1. Power Source Considerations
Choose based on availability and cost:
- Electric:
- Easy installation
- No ventilation required
- Higher operating cost
- Limited by circuit capacity
- Gas (Natural/Propane):
- Lower operating costs
- Higher heat output
- Requires proper ventilation
- Professional installation needed
2. Mounting Options
Consider installation requirements:
- Ceiling mount
- Wall mount
- Floor standing
- Portable units
3. Safety Features
Essential safety considerations:
- Overheat protection
- Tip-over switches
- Carbon monoxide detectors (for gas units)
- Cool-touch exteriors
Garage Heater Maintenance
Regular Maintenance Tasks
- Monthly Checks:
- Clean or replace filters
- Check for debris
- Inspect electrical connections
- Test safety features
- Seasonal Maintenance:
- Professional inspection
- Vent cleaning
- Burner adjustment (gas units)
- Thermostat calibration
Frequently Asked Questions About Garage Heaters
How much does it cost to run a garage heater?
Operating costs depend on:
- Power source (electric vs gas)
- Local utility rates
- Usage patterns
- Heater efficiency
- Garage insulation quality
Can I install a garage heater myself?
Installation considerations:
- Electric units may require new circuit installation
- Gas units require professional installation
- Local building codes must be followed
- Proper ventilation is crucial
- Safety certifications may be required
How long do garage heaters last?
Expected lifespan varies by type:
- Electric heaters: 10-15 years
- Gas heaters: 15-20 years
- Proper maintenance extends life
- Usage patterns affect longevity
- Quality of installation matters
What size circuit do I need for an electric garage heater?
Circuit requirements depend on heater size:
- Small units (2-3kW): 20-amp circuit
- Medium units (4-5kW): 30-amp circuit
- Large units (6-7kW): 40-amp circuit
- Extra large units: Dedicated 50-amp+ circuit
Are garage heaters safe?
Modern garage heaters include safety features:
- Automatic shut-off protection
- Temperature monitoring
- Sealed combustion chambers (gas units)
- CSA/UL safety certifications
- Built-in safety switches
How can I improve garage heater efficiency?
Efficiency improvement tips:
- Add insulation to walls and ceiling
- Seal air leaks around doors and windows
- Install a programmable thermostat
- Regular maintenance and cleaning
- Use during optimal temperature conditions
Should I get an electric or gas garage heater?
Consider these factors:
- Available utility connections
- Local energy costs
- Installation requirements
- Garage size and insulation
- Desired heating speed and capacity
What's the best temperature for a garage?
Optimal temperature depends on use:
- Workshop use: 60-65°F
- Vehicle storage: 45-50°F
- Living space conversion: 68-72°F
- Storage only: Above freezing
- Consider activity level and duration
Do I need a special thermostat for my garage heater?
Thermostat considerations:
- Must match heater voltage requirements
- Should handle wide temperature ranges
- Programmable features recommended
- Remote control options available
- Smart thermostats for enhanced control