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Need some help on getting kilowat capacity

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#2 ·
If you're only getting one leg of 240v- zero.

If you're connecting 120v to one leg and grounding the other leg to complete the curcuit, I would assume 1/2 the capacity.
 
#4 ·
Watts= Voltage x Voltage / Resistance

The resistance of a 10Kw heater rated at at 240 volts is about 5.76 ohms

The resistance won't change if 120 volts is applied... so if the voltage is halved, the wattage will be quartered.

Answer: 25%
 
Discussion starter · #5 ·
penderway said:
Watts= Voltage x Voltage / Resistance

The resistance of a 10Kw heater rated at at 240 volts is about 5.76 ohms

The resistance won't change if 120 volts is applied... so if the voltage is halved, the wattage will be quartered.

Answer: 25%
Click to expand...
Thanks. I had 50% then 25% when I read your post
 
Discussion starter · #8 ·
I read that sheet thank you it was great but still have a hard time finding the max watt density allowed in a duct heater the kw per sq foot of duct area
 
#9 ·
If there is a "rule of thumb" I'm not aware of it.

As you can see from the sample literature, it depends on several variables, heater type, outlet air temp, velocity etc.

My only suggestion is to get the model# and consult the manufacturer of your duct heater.
 
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