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02-12-2009, 09:56 PM   #1
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## Baseboard heater size?

I am going to be putting baseboard heat in a room approx 12 x 16, it is insulated, 2 2x6 exterior walls and 2 2x4 interior walls with 1 small window and need to know how many watt 240v unit or units I will need. Are there any good units to look at or stay away from? Thanks.

02-13-2009, 11:51 AM   #2
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You have 192 square feet, you might wanna go with 2000 watts but you could get away with 1750.

I find its a good idea to split up the heat and put two in a room, maybe put a 1000 close to the window and a 750 on the other side or someting like that.

 02-13-2009, 04:36 PM #3 Electrician     Join Date: Jan 2009 Location: Naugatuck, CT Posts: 186 Rewards Points: 150 If you use the 3 BTU per ft2 rule of thumb you'll get 576 BTU's needed for the room, which translates into 1964.16 watts needed of heat to heat efficiently. So 2000 is the better bet.

02-14-2009, 07:58 AM   #4
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Quote:
 Originally Posted by ctsmiths If you use the 3 BTU per ft2 rule of thumb you'll get 576 BTU's needed for the room, which translates into 1964.16 watts needed of heat to heat efficiently. So 2000 is the better bet.
You're numbers are incorrect.

First off, the rule of thumb is 30 BTU/sq ft and there are 3.4 btu per watt not the other way around as you explained.

So in this case: 12'x16'= 192 sq ft
192 sq ft x 30 btu/sq ft = 5760 btu
5760 btu / 3.4 = 1694.12 watts

There are also a couple other guidelines you can use and they all pretty much get you in the ball park.

You can use the 10 watt per sq ft rule: 12' x 16' = 192 sq ft
192 sq ft x 10 watts = 1920watts

Or you can use 1 watt per cubic foot (my favorite for rooms with high ceilings, cathedral ceilings, take the average height and use that for your calculation), in this case since I don't know your ceiling height we'll use 8'
12' x 16' x 8' = 1536 cubic ft , so @ 1 watt per cubic ft this also gives you 1536 watts.

These are all just rough estimates, and no matter what method you use I would round up. You would rather have more heat than you need and have it cycle on and off, than not enough heat and have the heaters on all the time and still not keep up with the demand.

IMO 2000 watts of heat should be used in this space, that would be the equivalent of 8' of heat ( I would use 2 4' pieces on opposite walls).

 02-15-2009, 10:15 AM #5 Electrician     Join Date: Jan 2009 Location: Naugatuck, CT Posts: 186 Rewards Points: 150 Using this calculator you'll need at least 1875, check it out. http://www.heatershop.com/btu_calculator.htm

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