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Old 12-19-2009, 10:27 AM   #1
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installing electric heat garage - frozen pipes?


Came back from vacation to frozen (evidently) PEX. Tubes run in the ceiling of the garage under my house. I have one 6 foot long electric baseboard run left over from my remodel, and a thermostat. I also have an abandonded double pole breaker. I want to install the heater in the garage to thaw out the pipes as well, as to keep the temperature in there at at least 50 through the winter since the kids bedrooms are above.

The thermostat has 3 wires, red, black and white.

What's the order of connection to the heater - through the thermostat? Any good visual links for a guy with ADD out there?

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Old 12-19-2009, 11:34 AM   #2
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installing electric heat garage - frozen pipes?


What is the wattage of the heater? It should have a label on it somewhere.

What is the wattage of the thermostat? Should say somewhere, maybe on the back.

What is the amperage of the breakers? It should say on the breaker flip lever.

What wire size are your going to use? This should say on the wire. Like 14 ga., 12 ga., 10 ga., etc.

And good for you mentioning ADD! I have a friend with ADHD and have learned to "splain" things to him, so if you need pictures or whatever, I know where you are coming from. Just ask...

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Old 12-19-2009, 11:45 AM   #3
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installing electric heat garage - frozen pipes?


240 heater, 120/240 thermostat.
Wire used before is 12 /2 for other heaters. Only installing one heater.
Thought of cutting off the feed from an abandonede 2 pole circuit, and wiring it to the new thermostat.
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Old 12-19-2009, 11:46 AM   #4
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installing electric heat garage - frozen pipes?


oh...and a 20 amp breaker.
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Old 12-19-2009, 12:55 PM   #5
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installing electric heat garage - frozen pipes?


The voltage would be like 120 or 240.

Wattage would be a number like 900, 1000, 1200, etc.

Or a 100 watt light bulb.

A 1000 watt microwave oven.

A TV which uses 234 watts.

Nameplate/Label would look sort of like this...
(picture not from heater)

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Old 12-19-2009, 01:03 PM   #6
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installing electric heat garage - frozen pipes?


Almost all baseboard heaters are 250 watts per foot. A 6' one would be 1500 watts, 6.25 amps at 240 volts.

A 15 amp two pole breaker and #14 wire will work, or a 20 amp breaker with #12.

Rob
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Old 12-19-2009, 09:23 PM   #7
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installing electric heat garage - frozen pipes?


That all seems great. I'll be using the 20amp, 2 pole breaker with 12/2 wire. The only question that remains is the thermostat connection.

I have a black wire (load), a red wire (line) and a white wire.

So, I have 2 wires and a ground coming from the panel, and I need to connect through the thermostat and out to the heater's 2 wires.

Final question....what's the connection look like at the thermostat?
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Old 12-19-2009, 10:56 PM   #8
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installing electric heat garage - frozen pipes?


Some thermostats are simple mechanical things and would just have two black wires (line, load) or 4 black wires (2 lines, 2 loads).

Others are electronic and would also need a white neutral wire to power the electronics in the thermostat. Sounds like you have this type of thermostat.

Might want to get a 240 volt 4 wire thermostat (2 wires in, 2 wires out).

Be sure the wattage/amperage rating of the thermostat is high enough for the heater you are installing. I'm sure every 240 volt thermostat they sell will be much higher rated than the heater you have (if it is as said above), but good to get in the habit of checking these things before buying.

It can matter if you add more space heaters or with other electrical projects. The switch or "gizmo" to turn things on/off will only be able to handle so much. This would be the rating and it will says amps or watts.

You could get one like in the following picture...
(Rated for 22 amps which would go beyond the breaker. So good one!)
http://www.houseneeds.com/shop/Heati...crabuypage.asp

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Old 12-19-2009, 11:35 PM   #9
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installing electric heat garage - frozen pipes?


no, I have a 240v and I'll be running 12/2 in and out of it.
It's the same thermostat that I pulled out that was in my house when I remodeled it.

It's got a red, black and white - 3 wires. It should be fine for the one heater in the garage I think. See pic...

What would the connections look like?
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installing electric heat garage - frozen pipes?-p1060600.jpg  
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Old 12-20-2009, 12:45 AM   #10
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installing electric heat garage - frozen pipes?


I have no idea what that white wire is for?

It looks like a mechanical thermostat to me????

I tried searching for the name on that and couldn't find a thing!

Perhaps you can wait a bit and maybe someone else knows....

(I would use a 240 volt thermostat myself, then when it was off, both hots would be off...)
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Old 12-20-2009, 12:29 PM   #11
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installing electric heat garage - frozen pipes?


Im thinking that that may be only a 120v thermostat. It would only have to cut off the hot wire and all whites wire nutted together. I second the buying a 240v t-stat. I dont like only opening one of the two legs.

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