Electric heater question

[Tomhanks]

Hi!

I have a small electric heater that works by converting electricity into heat using a spring-like metal element covered in a glass-like material. I've noticed that the glass-like material is developing black spots over time. Is this something to be concerned about?

Thank you in advance!

[machinist]

Hi Tomhanks! Welcome to the forum.

The black spots on the glass-like coating might be a sign of carbon buildup, oxidation, or damage from overheating. Have you noticed any change in the heater’s performance, like uneven heating or strange smells? Also, have you tried removing these spots? I want to know if they are embedded in the material.

Depending on the cause, it might be a normal aging process or a sign that the element is wearing out. Let me know, and we can figure out the best next steps!

[Tomhanks]

Hi, Machinist. It did smell like something was burning, but that only happened once. The heater seems to be working fine. It has two settings, and both are functioning properly. I can't reach the spots because there is a grille. Kindly see the attached pictures.

[machinist]

The black spots on your heating element's ceramic/glass coating are a serious safety issue, especially combined with the burning smell you experienced. What you're looking at is likely deterioration of the protective coating that insulates the metal heating element. When this coating breaks down, it can expose the metal element underneath, which creates a significant fire and electrical hazard.

The fact that the heater still works doesn't necessarily mean it's safe to use. Think of it like a fraying electrical cord - it might still conduct electricity, but the damaged insulation makes it dangerous. These ceramic-coated heating elements are designed to operate safely only when their coating is fully intact. Once that coating starts to break down, as shown by those black spots, the risk of electrical arcing, overheating, or even fire increases substantially.

Given what I can see in your photos and the burning smell you mentioned, I strongly recommend discontinuing use of this heater immediately. While it might be tempting to keep using it since it's still heating, the risk isn't worth it. I know replacing a heater can be inconvenient and costly, but it's far less expensive than dealing with fire damage or, worse, putting your safety at risk.

[Tomhanks]

Thanks! I see what you mean about the risks of the coating breaking down. That definitely sounds concerning.

I’m wondering, though, what if the black spots are just from some dust or debris burning off, especially since I haven’t noticed the burning smell again? Wouldn’t it be safer to just monitor the situation for now and keep an eye out for any changes in smell or further deterioration? I’m just a bit hesitant to replace the heater if it might be something minor, but I definitely understand the safety concerns you’ve mentioned.

[machinist]

I get why you want to keep using the heater, especially since it seems to be working fine now. But I have to say, electrical heating elements aren't something we want to take chances with. Even if those black spots are just burnt dust, the fact that you had that burning smell earlier makes me pretty worried.

The issue is that once a heating element's protective coating starts showing any signs of wear, it can deteriorate further quite rapidly, sometimes without obvious warning signs. By the time you notice more burning smells or visible problems, you could already be in a dangerous situation.

I really think it's better to replace it now rather than risk it failing at the wrong moment. I know it's a pain to spend money on a new one, but your safety is worth it. Modern heaters aren't too expensive and they're much safer too.

[Tomhanks]

Thanks for your input, I totally get where you're coming from. I actually just bought this heater recently, and it's been really effective despite the low price. I understand the concerns with the heating element, though, and I definitely want to prioritize safety. Do you have any suggestions for something affordable that heats up quickly and would be a good replacement? Also, do you think these electric space heaters with heating elements are worth using for short-term heating?

[machinist]

If you're looking for an affordable replacement that heats up quickly and prioritizes safety, consider ceramic space heaters. They heat up fast, have built-in safety features like tip-over and overheat protection, and are generally more efficient for short-term heating. Oil-filled radiators are another good option if you want something that retains heat longer, even after turning off.

As for electric space heaters with heating elements, they can be worth using for short-term heating, especially in small spaces, but they should always be used with caution, keeping them on a stable surface, away from flammable materials, and never leaving them unattended. If you're open to alternatives, infrared heaters might also be a good choice for quick, targeted warmth while being more energy-efficient.

[Tomhanks]

Thanks for the suggestions! Ceramic space heaters do sound like a good option, especially with their safety features. Do you have any tips on what to look for when choosing a ceramic heater, like specific features or size recommendations for a small room?

[machinist]

Look for features like tip-over protection, overheat shutoff, and a cool-touch exterior, especially if you have pets or kids around. In terms of heating capacity, most small ceramic heaters are between 750W and 1500W, which is plenty for a room up to about 150 square feet. An adjustable thermostat is a great feature to have since it gives you better control over the temperature rather than just switching between high and low settings.

If you want the heat to be distributed more evenly, consider a model with oscillation. Energy efficiency is another factor to think about, some heaters come with an eco mode that adjusts the power automatically to maintain a comfortable temperature without using unnecessary energy. A timer function can also be useful if you want the heater to shut off automatically after a set time. Lastly, if you’re sensitive to noise, check the decibel level, as some heaters are much quieter than others. In general, a compact, 1500W ceramic heater with safety features, a thermostat, and possibly an oscillation function should work well for a small room.

[Tomhanks]

Thank you for your valuable feedback, Machinist! I appreciate it.