Got this at Amazon last year. It has a thermostat and never stops unless you have a power outage.
Works well on a cold spot.
Lasko Oscillating Digital Ceramic Tower Heater for Home with Adjustable Thermostat, Timer and Remote Control, 23 Inches, 1500W, Silver, 755320
I recommend oil filled heaters such as made by Deloghi. They are the safest and thermostatically controlled.

You just have to keep the range so that the cold side doesn’t get too cold.
I think they’ll all stay unless it reaches a certain indoor temperature. Certainly should stay on full time if it’s below 60 or something, as long as you have the thermostat/heat control on full.
They have ceramic heat bulbs for reptile enclosures which last a very long time. I’ve used them for my sailboat motor over the winter, if you are just trying to keep a small plumbing enclosure above freezing. https://www.amazon.com/dp/B07MXD4SMW?tag=reptileslife-general-20 Different wattages/heat output available.
If you want to warm a room, I like the delonghi oil filled radiators best.
Even heating pads now shut off after 2 hours!
This is nuts!
Hot water heater?
It’s a water heater....hot water is already hot and does not need to be heated.
FWIW, any sort of clay pot and candle configuration is BS.
Law of conservation of matter and energy.
I would want a thermostat on any heater, just for fire prevention if nothing else
Open the doors beneath the sink on all exterior walls. You just need to keep the area above 32°F. Lots of people I know do this and set the furnace to the lowest temperature that it allows. Usually around 45-50°F and that’s what they do for their winter cabins. Exterior pump houses usually work fine with just a 60 watt incandescent bulb
I am having great results with two new ENVI wall mounted convection heaters. I installed them, one each, in two rooms on the north side of my home. Really, really effective. And, quiet! No fans...
I have a couple of Pelonis three-tube infrared quartz heaters from Walmart. I’ve had several kinds of electric space heaters, and they work the best. They are radiant heaters, though, with only a little convection heat from the top and no blower. They work better for people than objects.
For keeping plumbing from freezing, a noisy dairy barn type heater with a blower might be better. They have wire coils and fans in them.
The following puts out a lot of heat and is probably the best of kerosene heaters. The other kerosene heaters are of an older design (more of a spreader plate burner) that are more likely to emit stinky odor. But refilling the tank (approximately every 12 hours) can be messy, unless you have a plan for filling them (couple of covered buckets: one for storing the siphon and one for putting the tank in while filling).
You should also be able to get one at your local farm or ranch supply or hardware store. But you need a local source of bulk K1 kerosene: a gas station that sells it. A kerosene heater will stink when being shut down, by the way, and a little when being lit. They also don’t work well at elevations above 6,000 feet or so (too little oxygen).
I found that the thermostats on most of the little heaters like you are describing are poor at best and either stay on constantly or fail to come on. I bought some from Ebay that look sort of like a plug in lamp timer that you can set a digital temperature and they work well.
I just ran the resistance wire type heaters set to full on.
I use a ceramic heater in a work trailer. I keep it on for days and sometimes weeks at a time. It stays pretty low. Just to keep the contents from freezing.
Hey there. Why does it have to be a ceramic heater?
Why not a baseboard heater?
A baseboard heater w/ a thermostat would keep it at the temperature you want.
They make 120v baseboard heater that plug in to a receptacle if you aren’t knowledgeable about wiring a 220v model.
Good luck 👍
Rent the cabin to the demoncrat party for a ballot counting location. They will keep it heated until they get done counting ballots, which might be into December.
I only had one experience with one of those square ceramic heaters back in February of 2012 when I drove out to Indianapolis in early Febrary to watch the Patriots-Giants Super Bowl.
The only place we could find to stay was a KOA that was renting small cabins with heat. My buddy and I thought “Hey, we won’t be spending any time in it except to sleep!” so that seemed do-able. Except one of those nights was around 10 degrees, there was no insulation in the dinky cabin, and...the “Heating” it said it provided was one of those cheap ceramic cubes!
It was like throwing a brick in the Grand Canyon! It couldn’t even raise the temperature at all that we could tell!
I had broken my right hand during the game under circumstances too embarrassing to relate, and had a nurse who saw it happen do a field splint on the finger using a ballpoint pen and electric tape, and having imbibed adult beverages after a barely registering a sodden hiccup when she “reduced” my finger for me on the spot, got a ride back to our little frozen cabin to sleep it off.
There was no way I was going to an Emergency Room in Indianapolis on a Super Bowl night. I would have it checked out when I got home.
After what can best be described as a fitful night of freezing sleep in a bag, we drove back East, and every time I touched my field-splinted finger against anything (such as the turn signal stalk) while turning the wheel, it would send electric pain, un-numbed by any kind of pain killer, through my arm and directly into my brain.
I did not enjoy that ride much.
When I went to an ER, the orthopedic surgeon looked at it and told me sadly (me, who expected a splint and a quick trip home) that the injury required surgery with pins and rods.
I learned a lot about myself in those two days, some of which I hope improved me!
But one thing I did learn-I would not ever view those little ceramic heaters as anything more than an adjunct for cold feet in a warmly heated house!