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Old 03-19-2020, 12:15 PM   #1
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electric garage heaters


i wanna know about king portable garage heaters? does anyone have installed garage heater in 2 car garage. so tell me about what wattage are enough for heating 24 x 12 area?
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Old 03-19-2020, 12:37 PM   #2
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Re: electric garage heaters


-24 x 12 - 2 car garage?
-insulation type/amount?
-Nunavut or Miami or .....?
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Old 03-19-2020, 12:44 PM   #3
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Re: electric garage heaters


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-24 x 12 - 2 car garage?
-insulation type/amount?
-Nunavut or Miami or .....?
@joed may choose to move this.
yes, it is 2 car garage and uninsulated wanna know what wattage will be enough?
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Old 03-19-2020, 01:05 PM   #4
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Re: electric garage heaters


Moved to HVAC
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Old 03-19-2020, 01:51 PM   #5
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Re: electric garage heaters


1 - 1500 watt will make it warm. 2 - 1500 watt will make it warmer. 3 - 1500 watt will make it plumb toasty.
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Old 03-19-2020, 02:33 PM   #6
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Re: electric garage heaters


will you be parking wet or snow covered cars? Once the heat is turned off all of that moisture will form ice/frost on the exterior walls or bottom of roof deck.

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Old 03-19-2020, 04:13 PM   #7
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Re: electric garage heaters


A 2 car garage is about 24x24. A single car garage is about 12x24. 1500w (5,000 BTU) is the maximum any 120v portable heater can deliver.

Nobody likes rules of thumb but in a typical insulated residential environment, you need approximately one ton (12,000BTU) of heating per 400-800sq ft.

In an uninsulated 2 car garage (approx 600sq ft, assuming you really have a 2 car garage), I doubt a single 1500w heater is going to work.
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Old 03-19-2020, 05:22 PM   #8
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Re: electric garage heaters


One 1500 watt heater will make your electric meter spin like a drill , two will make it spin like a router and three will make it spin so fast you can split atoms Without knowing where you live , the insulation level of the space and what your expectations are we are just spinning our wheels .
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Old 03-19-2020, 05:56 PM   #9
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Re: electric garage heaters


What state/city will this be installed in?
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Old 03-19-2020, 06:41 PM   #10
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Re: electric garage heaters


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Nobody likes rules of thumb but in a typical insulated residential environment, you need approximately one ton (12,000BTU) of heating per 400-800sq ft.
So you would put the same amount of heating regardless of whether a house is a long, narrow rectangle or a square?

If you're going to use a rule a thumb, it should at least be based on exterior surface area, not floor area.
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Old 03-19-2020, 07:35 PM   #11
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Re: electric garage heaters


Rule Of Thumb:
"A broadly accurate guide or principle, based on experience or practice rather than theory"
Absolutely nothing wrong with sktn77a's answer. It supplies a starting point rather than an exact calculation.
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Old 03-19-2020, 07:37 PM   #12
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Re: electric garage heaters


Quote:
Originally Posted by user_12345a View Post

it should at least be based on exterior surface area, not floor area.
Basic BTU calculations ARE based on square foot area.
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Old 03-19-2020, 07:39 PM   #13
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Re: electric garage heaters


But the problem is there is no such rule of thumb.
And hvac is based on theory. Not someone’s opinion, or “experience”.
Sizing is NOT based on square footage.
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Old 03-19-2020, 08:15 PM   #14
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Re: electric garage heaters


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Basic BTU calculations ARE based on square foot area.

One would also have to consider ceiling height and whether a finished ceiling is in the garage or itís wide open.


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Old 03-19-2020, 08:29 PM   #15
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Re: electric garage heaters


The calculation for heat loss on a garage are so iffy due to the wide range of variables that you are better off calling the manufacturer of the unit you are considering buying and see what sizes they offer. Many times you can get the next larger size than you think you need for just a little more cost. With electric heat, there is very little efficiency lost by having one too big.

Example: With an uninsulated 2-car garage, you obviously won't be able to use the smallest unit available, which is usually a 5KW @ 240 volts. The next larger size is 7.5 KW but it costs nearly as much as the 10 KW, so there you go, get the 10KW one. That 10KW unit will require a 50 amp 240 volt circuit. It'll cost roughly $1/hr +- to run depending on what your PoCo charges for juice.

Insulate that garage and especially the door/doors, and you can get by with the small unit and cut the electric cost in half.

All of the above assumes it gets down in the teens at times where you live. If it gets below zero there, you will definitely need to insulate.

I'm not saying you can't or shouldn't calculate the heat loss but if the increments for selecting a proper unit aren't any closer than I usually see, you don't really need an exact loss number. Most people decide to forget it when they find out what it costs.

Last edited by surferdude2; 03-19-2020 at 08:50 PM.
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