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Old 12-12-2015, 07:27 PM   #51
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Old 12-12-2015, 07:33 PM   #52
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I have a couple of the King on my short list too, the KTW1215 which can be set at 250/500/750/1250/1550W, and the KT12262, which can be set at 750/1500W. The latter is a fair bit smaller in size, and 2.5 lbs lighter. Both use a squirrel cage fan.

https://docs.google.com/viewer?url=h...%2FKTW_WEB.pdf

https://docs.google.com/viewer?url=h...s%2FKT_WEB.pdf
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Old 12-12-2015, 07:37 PM   #53
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Mine's the PAW 1215.
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Old 12-12-2015, 09:18 PM   #54
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I'm surprised that no one has made the comparison to the gas-fired heater that's built-in.
Suburban (Atwood) AFSAD12 furnace is 12,000 Btu/H input, so that's about 9600 Btu/H output.
At 3.413 Btu/H per Watt, we have about a 2800 Watt heater.
So, to substitute an electric, on a really cold night, you'd be using
2800 W. / 120VAC = 23+ Amps.
Or is the electric a supplemental when you have shore power, so you don't use as much propane?
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Old 12-12-2015, 09:21 PM   #55
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Yes, I turn on the electric heat prior to falling asleep and afterwards the furnace takes over. I set the thermostat for the propane furnace for 64 at night. During the day we use the electric exclusively. Of course this only applies with hookups.
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Old 12-12-2015, 09:26 PM   #56
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Quote:
Originally Posted by Jim Bennett View Post
There is no code that limits what output an appliance has other than common sense, the limitation is the breaker for the circuit, and how much of a pain it would be to have to reset it. Should voltages drop below 120V for some reason, there is a good likelihood that the breaker would trip with an 1800W load. But yes, something less than 1800W would certainly make more sense. Even 1600W at a lower 110V is still just under 15A.
While an air conditioner or other appliance that is mostly a motor load will sometimes draw more current at lower voltages, a resistance heater won't. If the voltage drops, so does the wattage. The resistance of the heater is the constant (well, not quite since it varies with the temperature of the element) so if it is called a 1500 watt heater, and is designed for 120V, it will draw 12.5 amps at 120V. The resistance of the heater is 9.6 ohms (R=E/I). Drop the voltage to 100, and the current will be 10.42 amps (I=E/R). Wattage will be 1042 (W=IXE).
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Old 12-12-2015, 10:01 PM   #57
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Or is the electric a supplemental when you have shore power, so you don't use as much propane?
I pretty much use it as a replacement when I can, and just set the furnace lower in case it is needed. I prefer to run the electric heater through the night, as it is MUCH quieter.
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If the voltage drops, so does the wattage.
Gotcha, makes total sense now that you say it. I had lots of electrical education many, many years ago, and have very rarely drawn on it for a long time now.
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Old 12-12-2015, 10:06 PM   #58
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A different possible option RugBuddy under Carpet or Rug Heated Floor Mats Warm Floors
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Old 12-12-2015, 10:08 PM   #59
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Have you thought about under carpet / floor mat heater.....lot less power and feels good on bare feet.RugBuddy under Carpet or Rug Heated Floor Mats Warm Floors
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Old 12-12-2015, 10:25 PM   #60
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Those heat mats are more for comfort than space heating, though would certainly make walking on the floor a lot more comfy.
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