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Old 01-30-2009, 12:56 PM   #1
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sizing electric baseboard heaters


how do you size these for a bedroom? there are four bedrooms and these will be the only source of heat upstairs.

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Old 01-30-2009, 03:24 PM   #2
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sizing electric baseboard heaters


You could do a Manual J but that'd be overkill. Baseboard heaters list the approximate square footage it will heat. Baseboard heat is unique in that if you get a little oversized it shouldn't cost any more to operate than an exact size. Just be sure you position under a window for best effect.

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Old 01-30-2009, 03:52 PM   #3
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sizing electric baseboard heaters


Drewhart:

I agree with the previous post.

When it comes to hot water heating radiators, each of the major heating wholesalers in your area will employ a "heating specialist" who has been trained to determine total heating requirements in buildings under construction, or for new additions being added to existing buildings. These people aren't heating contractors, they're not even plumbers, they're just hired help or counter staff that have been with the company long enough to have been sent on courses to teach them how to size heating systems for buildings, and radiation requirements to heat individual rooms.

So, if you want an exact answer on how much heat you should design for in a particular room, just phone up any of the major plumbing and heating wholesalers in your area and ask to speak to one of their "heating specialists".

But, normally an electric space heater will have it's own thermostat, and you just set each electric heater individually.
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Old 01-30-2009, 03:56 PM   #4
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sizing electric baseboard heaters


If I may piggy back on this question.

If one installs a baseboard heat at 110vac does it cost 2x as much to operate for the BTU generated as a unit at 240 VAC?
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Old 01-30-2009, 04:22 PM   #5
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10 watts per sq. ft with 8 ft. ceilings is a pretty good rule of thumb...
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Old 01-30-2009, 04:24 PM   #6
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Quote:
Originally Posted by AndrewF View Post
If I may piggy back on this question.

If one installs a baseboard heat at 110vac does it cost 2x as much to operate for the BTU generated as a unit at 240 VAC?

A watt is a watt, so to answer your question, no.
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Old 01-30-2009, 04:41 PM   #7
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Quote:
Originally Posted by AndrewF View Post
If I may piggy back on this question.

If one installs a baseboard heat at 110vac does it cost 2x as much to operate for the BTU generated as a unit at 240 VAC?
A 220VAC heater does use 2x amount of watts, but that's because it produces 2x the amount of heat. And since you are charged on watts you pay 2x $$$. But in the end you get what you pay for.

The only real difference is in installation. Here's an excellent post that explains the pros and cons of 220VAC vice 110VAC.
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Old 01-30-2009, 06:15 PM   #8
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1.5 KWs is the same amount of KWs weather its 110 volt, or 220 volt.
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Old 01-30-2009, 06:22 PM   #9
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The same wattage with higher voltage will only draw less amps IE a smaller breaker. But still costs the same to operate.
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Old 01-30-2009, 06:30 PM   #10
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220 is usually better as the wire size for the same amperage (110 volts) needs to be much larger/more expensive.
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Old 02-11-2009, 11:27 PM   #11
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so 11.25 watts per sq. ft. for 9 ft. ceilings is a good rule of thumb? and for the wiring, is ok to run the wire up to the attic and then down between two studs? the rooms are already finished.
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Old 02-12-2009, 05:22 AM   #12
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38 BTUs per sq ft, will cover most any house.
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Old 02-12-2009, 02:20 PM   #13
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Quote:
Originally Posted by drewhart View Post
... and for the wiring, is ok to run the wire up to the attic and then down between two studs? the rooms are already finished.
Shouldn't be a problem, but always best to check with local codes.
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Old 02-12-2009, 02:25 PM   #14
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What's a watt??
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Old 02-12-2009, 04:53 PM   #15
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sizing electric baseboard heaters


amps X volts = watts. its a unit of power, metric system.

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