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Old 12-25-2010, 03:14 PM   #1
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240v thermostat on 120v baseboard?


I have a 6 pack of Honeywell RLV4300 programmable thermostats. Specs are 3000w max load at 240VAC and they work fine for the 240v baseboard and fan forced heaters.

Would it be possible to use these on a 120V 750w baseboard heater?
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Old 12-25-2010, 03:26 PM   #2
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240v thermostat on 120v baseboard?


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Originally Posted by DragonFire View Post
I have a 6 pack of Honeywell RLV4300 programmable thermostats. Specs are 3000w max load at 240VAC and they work fine for the 240v baseboard and fan forced heaters.

Would it be possible to use these on a 120V 750w baseboard heater?
Yes, at half the max rated power (same maximum current). Just wire the hot through one pole of the thermostat and leave the other pole disconnected. Alternatively, wire both poles in parallel to divide the load between the two halves.

The only catch is if these thermostats are powered by the line. They may require 240V to operate. You can check the manual on this and see what i says. If it's battery powered then this will not be a problem.
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Old 12-25-2010, 04:57 PM   #3
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240v thermostat on 120v baseboard?


This particular model seems to depend on connection to a 240 Volt circuit, with at least a 500 watt heater connected in series.

I doubt it will operate properly on a 120 Volt circuit. You can try, but no guarantees here.

Edit to add:

I found a more recently updated owners manual for this unit, and it says 120/240 Volts. If this is the case, it should work fine with your setup.
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Old 12-25-2010, 06:14 PM   #4
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240v thermostat on 120v baseboard?


Thanks kbsparky,
There indeed seems to be additional information in the revised manual regarding 120v.

I am going to email the manufacturer to see what they say. Hopefully these would work on 120v as it would save me buying another separate programmable thermostat.
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Old 12-27-2010, 03:13 PM   #5
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240v thermostat on 120v baseboard?


I received a confirmation email from Honeywell, and yes these do definitely work on both 240v and 120v at 3000w and 1500w respectively.
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