12V 24V 220V 100W 200W 300W Insulated PTC Ceramic Air Heater PTC Heating elements Electric Heater PTC air heater (12V 100W 983226MM)

I like how they don't have a fan and it just a radiant heat source so they consum very little batty power. Just so I can turn one off. I use two of them 100w 12volt setting it works great . I placed one under driver and front passenger seats. I have a 200amp lithium battery with a 40 amp DC to DC charger . Just my drive time to and from work 30min.it keeps up no problem . Because I leave them on as trickle heat you can definitely tell a difference inside temperature of work van and outside temp . But most important they are safe to use they are made to leave on 24/7.

Impressive little 12v 100 watt heating element. I picked up four of these to use as an air preheater project on an auto engine similar to way Dodge uses a preheater on their diesels. I've checked each out and while they may register about 3.7 ohms when cold the resistance quickly decreases when power is applied. In addition, while the units I bought are rated 100 Watts at 12 volts they will definitely generate more wattage out with increased voltage. I saw as high as 128 watts when operating at 14.4 volts. These PTC heaters are really designed for forced air cooling to get the best results. I combined the four units into an intake plenum and used a 44 cfm muffin fan for an airflow test. At full fan speed the outlet was producing about 120F. By reducing the airflow to half or less the outlet temps would rise to 170+F. I'll probably add a thermal snap switch to cut power to the relay operating the heaters at 140F so they aren't trying to melt any surrounding plastics. Overall I'm very pleased with the PTC heaters. If you are looking for a means to warm a small area with hot air then these are a good option.

I have the 24V 100 watt version. I did a temperature test while measuring the current at 24V with no air flow. The current increased from room temperature to a peak of almost 6A at about ~120C then started decreasing. I pulled the plug when the unit hit above 200C. So it does have a positive temperature coefficient, but I wouldn't say it's self regulating. I'm using it as a forced air heating element and it does the job, but I will have a thermal fuse on it to prevent fires. It has loose dimensional accuracy, so keep that in mind.

Using a 14 amp 12v supply, I managed to get it up to 110 F, but for some reason it then settled at 86 F. This was in a room that was at 80 F already. Pathetic waste of money. Update: using 110V AC, it did actually get hot, so it could be useful. There does not appear to be any differences between the 12V DC, 24V DC and 110V AC listings, but who really knows? I am using the 12V 10A rated unit, with a 110V AC mains supply - I guess I will find out how long it lasts.

Excelente producto

As of now, I am not sure what I am going to use it for. I purchased it as an experiment and am quite happy with the results. Nice product with fair price.

I bought this to heat up an enclosed space for an experiment, and I needed the rated 100 watts of heat. What I didn't understand from the rather confusingly-worded description is that the built-in "energy saving feature" means that the heater output drops drastically as the heater temperature rises. (I assume this is to keep it from starting fires, not for "energy saving".) The end result is that it only developed about 30 watts in air, and even mounting it directly to a PC-type cooling fan at max speed would not give more than 65 to 75 watts of heat output. So rating it at 100W is perhaps a bit misleading - at best you will need a LOT of cooling air to get there. Other than that, it worked fine although it didn't meet my need.

Tested when first received it, and it worked as I expected. Haven’t yet used in actual intended application, so can’t comment on reliability after extended use.