Holly vented wall heater thermostat


Old 04-08-15, 05:09 PM
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Holly vented wall heater thermostat

I have an old holly vented wall heater model 25 WS-WD and a similar double wall heater also holly vented. Lights up and heat.
Where is the thermostat? The knob has mark for low, medium and high but even if I keep it turned to the low it wont turn off, so I wonder if it has any thermostat or ...?
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If it doesn't, can I install one and which model and how?
My son is a plumber.
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Old 04-08-15, 05:58 PM
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Welcome to the forums.

I can find almost no information on that heater. It looks like Holly Heaters was a division of Lear Siegler at one time.

That type of heater didn't come with a thermostat and it is not designed to have a thermostat installed or attached to it.
Old 04-11-15, 07:53 PM
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I've worked on many of that model. Pull the top grill off and look down inside at the heat exchanger. That is where they usually may have a crack. You can add a thermostat to the system, however all the old controls must be replaced which is quite expensive for an old furnace.
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