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3 & 4 Car Garage Heater Selection Chart

Home > Electric Garage Heaters > Electric Garage Heaters Reviews & Buyers Guide               Shop Now Shop Now

(Up to 450 sq ft)
(Up to 700 sq ft)
(Up to 900 - 1100 Sq Ft)
 
How to read this sizing chart
Is your 3 car garage or workshop Insulated or Non-Insulated?
Is your 4 car garage or workshop Insulated or Non-Insulated?
What's your ceiling height? 8, 10 or 12 feet
How cold is it outside in the winter? 20F, 10F, 0F
 
3 Car Garage  3 Car Garage      Shop NowShop Now 
 
 South (20F)      Middle (10F)      North (0F)       
 
 
50F Temperature Rise
60F Temperature Rise
70F Temperature Rise

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70F inside
20F outside
70F inside
10F outside
70F inside
0F outside
3 car, 8 ft ceiling
up to 900 sq ft
8,200 watts (10 kw)
9,100 watts (10 kw)
9,900 watts (10 kw)
3 car, 10 ft ceiling
up to 900 sq ft
9,900 watts (10 kw)
10,900 watts (15 kw)
11,850 watts (15 kw)
3 car, 12 ft ceiling
up to 900 sq ft
11,500 watts (15 kw)
12,600 watts (15 kw)
13,800 watts (15 kw)
 
 
 
 
 
 
 
(kw) is the suggested electric heater in Kilowatts
 
 
 
 
 
 
50F Temperature Rise
60F Temperature Rise
70F Temperature Rise

Shop Now

70F inside
20F outside
70F inside
10F outside
70F inside
0F outside
3 car, 8 ft ceiling
up to 900 sq ft
24,600 watts (25 kw)
27,100 watts (30 kw)
29,600 watts (30 kw)
3 car, 10 ft ceiling
up to 900 sq ft
29,600 watts (30 kw)
32,500 watts (35 kw)
35,500 watts (35 kw)
3 car, 12 ft ceiling
up to 900 sq ft
34,500 watts (35 kw)
37,900 watts (40 kw)
41,400 watts (45 kw)
 
 
 
 
 
 
 
(kw) is the suggested electric heater in Kilowatts
 
 
 
4 Car Garage 4 Car Garage        Shop NowShop Now
 
South (20F)     Middle (10F)     North (0F)      
 
50F Temperature Rise
60F Temperature Rise
70F Temperature Rise

Shop Now

70F inside
20F outside
70F inside
10F outside
70F inside
0F outside
4 car, 8 ft ceiling
up to 1100 sq ft
9,800 watts (10 kw)
11,750 watts (15 kw)
13,700 watts (15 kw)
4 car, 10 ft ceiling
up to 1100 sq ft
10,800 watts (15 kw)
12,950 watts (15 kw)
15,100 watts (15 kw)
4 car, 12 ft ceiling
up to 1100 sq ft
11,800 watts (15 kw)
14,100 watts (15 kw)
16,500 watts (20 kw)
(kw) is the suggested electric heater in Kilowatts
50F Temperature Rise
60F Temperature Rise
70F Temperature Rise

Shop Now

70F inside
20F outside
70F inside
10F outside
70F inside
0F outside
4 car, 8 ft ceiling
up to 1100 sq ft
29,400 watts (30 kw)
35,250 watts (35 kw)
41,100 watts (45 kw)
4 car, 10 ft ceiling
up to 1100 sq ft
32,300 watts (35 kw)
38,800 watts (40 kw)
42,200 watts (45 kw)
4 car, 12 ft ceiling
up to 1100 sq ft
35,300 watts (35 kw)
42,300 watts (45 kw)
49,400 watts (50 kw)
(kw) is the suggested electric heater in Kilowatts
 
 
What does Temperature Rise Mean?
Example with 60F Rise
Pick any outdoor winter temperature and add the temperature rise to your number.
5F outdoors + 60F Rise = 65F indoor temperature
15F outdoors + 60F Rise = 80F indoor temperature
 
What does insulated garage mean to us?
Insulated walls, ceiling, garage door, and good windows
If you only have a few of insulated parts make sure you increase your heater's size.
 
What if you need a 40 Kw heater? A standard home has two voltages 240 volts (electric stove, electric dryer) and 120 volts. 240 volts will Max out at 10,000 watts, so you will need two heaters for 40,000 watts..
  • Four 10,000 watt heaters.
  • Each heater will need its own 50 amp breaker thats a total of 200 amps just for your garage plus another 100 amps min for the rest of your home.
  • Solution insulate the garage as much as you can before you heat your garage.
Note: 240 volts 3 phase is a commercial & industrial voltage THIS WILL NOT WORK FOR A HOME. 3 Phase means you have 3 power lines coming into your home.

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