Oil-filled heater failsafe thermostat?

So I run an oil filled heater with just a dial on the front with a range of 1-9 for the output. I’ve got it set at a level that is very consistent and I work from home, so i’m in the room frequently. I however would like to get some type of thermostat to use for this.

what recommendations does everyone have for the best thermostats to use? I believe it needs to be considered a “high-power” thermostat as I believe all oil-filled heaters like mine are in the 1500W range.

This is what I would probably use as a failsafe.


I use a Herpstat 2, the VE @randall_turner_jr posted is a great option though since it goes up to 1500w. Just make sure if you use a standard VE or hepstat that the heater is set on low and the rheostat dial is set to high. The medium and high settings will most likely be too many watts, the low setting on most oil heaters is 7-900 watts.

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We also use an oil filter radiator I am searching for one with a clear thermostat on


I like this thought for now, as I’ve got a spare probe for my herpstat 2 that isn’t in use. I’ve got a voltage meter that I can run an outlet through to see how much watts/volts the heater is pulling. Looks like I’ve got 700/900/1500 for my 3 modes.

I have a VE High Power for one of my setups and a dual stage ranco thermostat for the other.

The Ranco setup is two independent systems wired so that if one thermostat happens to fail and stick on the other one will catch it and shut down as temperatures heat up (primary is set to 78, backup set to 82 or so going off memory).

Those ranco setups are expensive and it’s difficult to find one wired for this these days (I just searched and couldn’t find it). So I would recommend the VE High Power for your needs.

I definitely would not trust the built in thermostat on the oil filled heater - too much at stake. On top of that I would recommend a remote monitoring setup, like sensorpush. I read about 2-3 collections lost per season that could have been entirely avoided with a $150 investment into a remote monitoring setup like sensorpush.


So just thought I’d come back to this post as I finally ended up getting something set up after talking with Dion at Herpstat. He helped me better understand why they don’t make a high-power model anymore. Quote from his email for anyone wondering how they work, if they didn’t already (was nice to get this detailed of a response, great customer service from him)

"I had a Herpstat HP and Herpstat HP version 2 for those. I discontinued them a couple of years ago.

With any relay based thermostat the contacts of the relay will have a spark when the power is disengaged. Because of that the contacts wear out over time. This means the thermostat is like a hour glass counting down until it can no longer hold the high current. Which is fine as long as you recognize this and understand you will be replacing the thermostat in a few years.

I did months of testing different relays and found some high quality ones that would extend the life by 2-3 times a normal relay. I also used additional voltage tracking to try to disengage the relay when the electrical sinewave was at it lowest voltage. This made a huge difference and in my tests I squeezed another 2-3 times of life out of the relay. So there were several good advancements for that product and it originally released at around $150.

The problem is when there are other alternatives out there for less money people jump to those. I cut some pricing down to around $125 but any lower and it wasn’t worth our time to build them.

Overall, the product just no longer made sense to keep in the product lineup. High liability, low profit, low sales."

Then he pointed me towards the Inkbird C206T, which seems like a steal for $30. I’m using that in conjunction with a Govee wifi thermometer in the room. I’ve been doing a temperature drop at night to try to see how my animals act. Might go back to a constant temp but this is just a trial to see how well it works. I’ve had it up and running for a couple weeks now and made some small tweaks, and i think i’ve got it dialed in.

Here’s the Inkbird for anyone curious: Temperature Controller C206T – INKBIRD
I appreciated the honesty from Dion that these types of controllers have the tendency to burn out faster than a different style of thermostat.
This is the Govee sensor I’m using as well. I went with this brand (I know sensor push is pretty popular in the hobby as well) due to the simplicity of already having the app for a meat thermometer for my smoker. Didn’t want to have to download more apps to deal with, already have way too many lol.
Govee Wi-Fi Smart Temperature Humidity Sensor - Indoor

Here’s a snapshot of the data from the Govee App, which I think is pretty cool. I know sensorpush does something basically the same, so just for reference for those that haven’t used it before.

You can see there’s some fluctuations with the max/min temps, but this was on my end playing with things to get it dialed in right where I wanted it. The Inkbird has an option to calibrate the thermostat, and I had to adjust it by about 1.1 degrees to be in line with the Govee sensor. Overall, $60 for the pair and I feel alot safer with the animals in my reptile room!

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