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Heating watts needed?

M

Mike (WA)

Well-known Member
The post about Eden Pure heaters, concluding that Watts is Watts, prompted me to post.

I'm going to build an addition to my shop, to store my old car and for a work area in winter that is easier to heat than the larger "main" shop. It will be 500 Sq. Ft., well insulated and sheetrocked, roof height 10 feet. Outside daytime ambient temp in winter is about 40 degrees, but down to 30 at night routinely, 0 on rare occasions and for only a few days. We have the cheapest electricity on the planet (still less than 5 cents a KW hour- that's what you get when water just keeps coming down the river forever).

So I'll get an electric heater, probably a portable 240V Cadet. My question- how many watts do I need to heat that space to 60 when its 35 outside?
 
impossible to exactly calculate without know what r value.. and other issue like eave seals, open or enclosed cieling,, bent ridge? etc..
 
My "man cave" is 12x20, one room in an unheated separate garage, with 2x4 walls, in the same climate you are in. I heat it with an oil-filled 1500W heater, usually it's set on the 900W setting. It keeps that room about 65F most of the time. When it gets down in the low 20s, which is unusual around here, I can turn it up to the 1500W setting and it will keep it around 60. So, for your addition, I would think that 1500W would be adequate most of the time. Keep a milkhouse heater handy for lower temps. If you're keeping a car in there, you'll need to have an insulated garage door, of course.
 
Mike, I have a 5000 watt Oullet 240VAC heater in my shop(24X20X10)here in Renton. Heats it up real nice when I want to work out there in the winter.
Heater
 
R value of insulation will be whatever will fit in 2 X 6 walls and ceiling. Sloping ceiling, going from 8 foot to 12 foot ("shed" roof- lean-to on the side of an existing building). Eaves and everything else will be sealed, of course- that's the whole point of doing this.
 
Thanks, Fred- I was trying to think of something snarky to say regarding comparison between Chehalis and Buckley climates, but couldn't come up with anything. LOL
 
(quoted from post at 19:51:46 11/07/13) My question- how many watts do I need to heat that space to 60 when its 35 outside?
Click to expand...

http://www.builditsolar.com/References/Calculators/HeatLoss/HeatLoss.htm

Im not going to punch in the numbers for you but you will get a pretty accurate answer with the above webpage. Keep in mind, its garbage in-garbage out; if you put inaccurate R values in, the results you get will also be inaccurate. I say that because many times listed R values are way off or listed as "best possible install".
 
Mike,
I have a 24x24 attached garage. R20 in walls, R50 attic, insulated garage doors, thermal pains in garage door and 3 windows.

A simple 1500 watt baseboard will keep garage at any temp I want.

It's not the watts that counts, it's the insulation, plus one wall has no heat loss because it's against the house.

The Eden Pure heaters, amish heaters, are horses that have been beaten to death on YT just like NEC codes.

All one needs to do is google kw-hr per btu.

1 kw-hr = 3412.141633 btu
 

Mike, I have just about exactly the same structure, but my elec. costs way more than yours, so I heat with a catalytic propane heater. The heat escaping from the smaller room nearly keeps the outer at 40 degrees.
 
Hang some rafters and then enclose a 8 ft ceiling with white tin. A bunch of HO cold WX tubes and blown in insulation will really brighten it up and save heat.
 
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