Oil filled radiators work great. I have used them for years for my house and for my snakes. I'd still buy the Ranco thermostat, but I'd use it as a backup and use the built in thermostat on the heater as the primary temperature control. Set the built in thermostat to the temp you want and keep it hooked up through the Ranco with the temp set at your fail safe high temp. That way if the main thermostat fails and the heater runs away, the Ranco will shut it down.
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