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Old 11-17-2010, 03:53 PM   #1
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reliable thermostat for electric baseboard heat


currently have the dial therm. it is very inaccurate. help with reasonably accurate thermostat for electric baseboard heat

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Old 11-17-2010, 06:55 PM   #2
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reliable thermostat for electric baseboard heat


First, where is the thermostat mounted? Is it on the wall or on the baseboard. How big is the room? Room air flow can have an effect on its operation.
Does it have a temperature setting or is it just a Low to High dial?

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Last edited by a7ecorsair; 11-17-2010 at 06:58 PM. Reason: Added additonal information
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Old 11-18-2010, 11:45 AM   #3
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reliable thermostat for electric baseboard heat


thermostat is on the wall across the room from the baseboard. room is about 12'w x 17' long...no furniture next to basebd so air flow is open the dial does show temperature gradients, but apparently they are very inaccurate
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Old 11-18-2010, 01:53 PM   #4
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reliable thermostat for electric baseboard heat


Do you have a wide temperature swing in the room or is the setting just inaccurate?
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Old 11-19-2010, 07:34 AM   #5
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reliable thermostat for electric baseboard heat


Line voltage thermostats typically have a bi-metallic element that directly controls the load. These can have a large differentials (5 degrees or more) and inaccurate dial markings on them. Some of them use "warmer" or "cooler" indications instead of degrees because of this design problem.
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Old 11-19-2010, 07:57 AM   #6
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reliable thermostat for electric baseboard heat


Some line voltage controlling thermostats have screwdriver adjustments inside for calibration. You could hang a thermometer next to the thermostat and observe when the thermostat comes on and adjust the screws inside.

Usually a double pole thermostat will not make or break both poles at exactly the same time.

Also there is supposed to be a spread (the term is hysteresis) where if the thermostat comes on after the temperature has slowly fallen to X degrees, it will be X plus some number, perhaps five, before it shuts off.
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Old 11-19-2010, 08:57 AM   #7
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reliable thermostat for electric baseboard heat


Quote:
Originally Posted by kbsparky View Post
Line voltage thermostats typically have a bi-metallic element that directly controls the load. These can have a large differentials (5 degrees or more) and inaccurate dial markings on them. Some of them use "warmer" or "cooler" indications instead of degrees because of this design problem.
This is exactly why I'm wiring my new house with 24v definite purpose contactors. I can then use a programmable thermostat.

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