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I got some help from folks here identifying this as a gas unit heater.

I'm wondering if it's safe to replace the thermostat with a smart thermostat, and if there are any caveats, E.G. minimum on and cool down settings. (Should I be wary of regular home heating advice given this kind of heater, or am I over worrying?)

The main reason I want to get a new thermostat is that this thing currently reaches target temperature, turns off, then kicks back on when it falls 1 F (or not even, it seems), which is way too often for my poorly insulated apartment. I'd prefer something like 5 F.

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  • Can you get us a photo of the nameplate and/or wiring diagram on the unit please?
    – ThreePhaseEel
    Commented Feb 15, 2021 at 12:44
  • Sorry, I didn't have a ladder to get close enough. But I had someone come by today and appears to work fine. Thanks for your interest in helping.
    – Andrew Cheong
    Commented Feb 26, 2021 at 5:17

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It will be perfectly fine. The internal control and safeties of the heater will prevent most bad™ things from happening.

A smart thermostat will come preprogrammed with reasonable defaults for hysteresis and min turn on.

One additional thing you should consider adding is a CO detector, which will alert in case the unit starts emitting the toxic odorless and colorless gas into your living space.

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