What size heater do you need?
For primary heating a good rule of thumb is to use 8 to 10 watts per square foot, for supplemental heating use 6 to 7 watts per square foot (wattages based on normal insulation). For best results contact your local electric utility or electrical contractor.
Quick Reference Chart
| ROOM SIZE FT2 | VERY GOOD INSULATION INSULATION (WATTS) |
MODERATE INSULATION INSULATION (WATTS) |
MINIMUM INSULATION (35 YEAR OLD CONSTRUCTION) |
|
50
|
400
|
500
|
600
|
|
75
|
600
|
750
|
900
|
|
100
|
800
|
1000
|
1200
|
|
125
|
1000
|
1250
|
1500
|
|
150
|
1200
|
1500
|
1800
|
|
175
|
1400
|
1750
|
2100
|
|
200
|
1600
|
2000
|
2400
|
|
225
|
1800
|
2250
|
2700
|
|
250
|
2000
|
2500
|
3000
|
|
275
|
2200
|
2750
|
3300
|
|
300
|
2400
|
3000
|
3600
|
|
325
|
2600
|
3250
|
3900
|
|
350
|
2800
|
3500
|
4200
|
|
375
|
3000
|
3750
|
4500
|
|
400
|
3200
|
4000
|
4800
|