Electric Radiator Size Calculator
Calculate the appropriate electric radiator size for your room by entering the details below.
List of the Best Electric Radiator:
Understanding Electric Radiators
Electric radiators provide efficient, zone-controlled heating with precise temperature regulation. They work by converting electricity into heat, distributing warmth evenly through convection or thermal radiation.
Types of Electric Radiators
| Type | Description | Best For |
|---|---|---|
| Oil-Filled | Uses thermal oil to retain heat | Long heat retention, steady warmth |
| Ceramic | Heats quickly with ceramic elements | Fast heating, responsive control |
| Infrared | Radiates heat directly to objects | Spot heating, outdoor spaces |
| Panel Heaters | Thin, wall-mounted convection heaters | Space-saving, modern homes |
| Smart Radiators | WiFi-enabled with programming | Energy savings, remote control |
Benefits of Electric Radiators
Efficiency
- 100% energy efficient at point of use
- No heat loss through ducts
- Precise temperature control
- Zone heating reduces waste
Installation
- No plumbing or gas lines needed
- Simple wall-mount or freestanding
- Plug-in or hardwired options
- Minimal maintenance required
Comfort
- Silent operation
- Even heat distribution
- No dry air circulation
- Adjustable thermostats
Cost Control
- Pay only for what you use
- Programmable timers
- Room-by-room control
- No standby losses
How to Choose the Right Electric Radiator
Wattage Requirements by Room Size
| Room Size | Recommended Wattage | Radiator Type |
|---|---|---|
| 100-150 sq ft | 1000-1500 watts | Oil-filled or panel |
| 150-250 sq ft | 1500-2500 watts | Oil-filled or ceramic |
| 250-400 sq ft | 2500-4000 watts | Dual-element radiators |
| 400+ sq ft | Multiple units | Combination system |
Important Selection Factors
1. Heat Output (BTU vs. Watts)
Understanding heating capacity:
- 1 watt = 3.412 BTU/hr
- Small rooms need ~10 watts/sq ft
- Large/poorly insulated rooms need ~15 watts/sq ft
- BTU calculation: (Room Volume × Insulation Factor × Climate Factor)
2. Placement Considerations
Optimal radiator positioning:
- Under windows (counter cold air drafts)
- Against exterior walls
- Minimum 6" clearance from furniture
- Avoid obstructing airflow
3. Control Options
Temperature management features:
- Mechanical thermostats (basic)
- Digital programmable thermostats
- Smart WiFi controls
- Frost protection modes
- 24/7 scheduling
Frequently Asked Questions
How much does it cost to run an electric radiator?
Operating cost calculation:
- Formula: (Wattage ÷ 1000) × Hours × Electricity Rate
- Example: 1500W × 8h × $0.15/kWh = $1.80/day
- Monthly estimate: $50-$150 depending on usage
Are oil-filled radiators more efficient?
Efficiency comparison:
- All electric heaters are 100% efficient
- Oil retains heat longer after turning off
- Ceramic heats faster but cools quickly
- Choice depends on usage patterns
Can I leave an electric radiator on all night?
Safety considerations:
- Modern units with tip-over protection are safe
- Use lower nighttime temperatures
- Ensure proper clearance from bedding
- Look for units with overheat protection
How long do electric radiators last?
Lifespan factors:
- Typical lifespan: 10-15 years
- Oil-filled units often last longer
- No moving parts = less wear
- Depends on usage and maintenance
What size radiator for a 12x12 room?
144 sq ft room:
- Well-insulated: 1440 watts (144 × 10)
- Poor insulation: 2160 watts (144 × 15)
- Common size: 1500W oil-filled radiator
Do electric radiators dry the air?
Humidity impact:
- No moisture removal like forced air
- May feel drier because warm air holds more moisture
- Add a humidifier if needed
- Better for air quality than furnaces
Can I install an electric radiator myself?
Installation options:
- Plug-in units: DIY installation
- Hardwired units: Electrician required
- Follow manufacturer clearances
- Check circuit capacity
Are electric radiators good for main heating?
Whole-house considerations:
- Possible but expensive in cold climates
- Best for supplemental or mild climates
- Zone heating reduces overall costs
- Combine with insulation improvements