how to protect glass top stove from cast iron, heat diffuser, heat diffuser glass top stove, glass stove top protector, cast iron cookwareGlass top stoves are pretty. The smooth layer of glass on the top gives your kitchen a modern beauty that exudes class and elegance. But when you crack that glass with a heavy pan, especially cast iron cookware, all of that beauty goes out the window. Clearly, you need to protect your glass top stove, particularly when using cast iron on the glass. But what’s the best way? Carry on reading for our recommendations on how to protect glass top stove from cast iron.

Firstly, let’s look at heat diffusers. Heat diffusers won’t protect your stove from harm altogether, but they will make it much harder for you to damage your glass top accidentally.

Do Heat Diffusers Really Work?

glass cooktop protector, induction cooktop protectorYes. I’ll go into more depth on this topic after the product reviews, but for now, let’s get this basic fact out of the way. Heat diffusers do exactly what they say on the box. They help spread out heat evenly and they help provide a safety net so you don’t damage your range or your pots and pans. There are some downsides to these devices, of course, but the bottom line is that they’re effective.

More importantly, however, they’re crazy cheap. You can get a fairly nice heat diffuser for less than the price of a fancy lunch. If you have a glass top stove, you really ought to pick up a heat diffuser and try it out. Even if you decide you hate it, you’re only out a few dollars.

Product Reviews: Top Heat Diffusers for Glass Top Stoves

* HIC Heat Diffuser Reducer Flame Guard

This heat diffuser is an aluminum disk attached to a metal handle. The disk is designed to evenly transfer heat throughout the whole device. This means that you can use it to evenly heat a large pot on top of a small burner.

When it comes to protecting a glass cooktop, this tool is perfect.


First of all, it’s made from aluminum. This means that heat will spread through the diffuser quickly. You don’t want a diffuser that slows down your cooking unnecessarily. Instead, you want one that’s more-or-less thermally transparent. This means you want aluminum, not steel.

Second, it’s got both a flat side and a not-flat side. This lets you put the flat side in full, even contact with your glass top range. Cookware with uneven bottoms can quickly scratch, chip, or crack the glass on top of your range. If you put your cookware on this diffuser, however, you’re putting the diffuser in between any imperfections and your glass stovetop. This will dramatically reduce the chances of things breaking.
hic simmer plate, hic heat diffuser, hic brand
This logic also applies to glass, porcelain, and enamel cookware. Normally, you want to avoid using these items on a glass stove for a multitude of reasons. With this heat diffuser in between your stove and your cookware, however, you can use cookware made out of pretty much any material you want.

There are a few downsides to this unit, of course. First, it’s not effective on induction ranges, or at least it’s not advertised as such. You should look for a special “adapter plate” if you want to protect your induction range. It’s probably a better idea to simply use induction-compliant cookware, however, which will almost always come with smooth metal bottoms that won’t damage your glass-top stove.

Second, it will slow down your heat a little bit. Aluminum diffusers like this one are pretty thermally transparent when compared to stainless steel heat diffusers, but they’ll still make it take a little bit longer to boil water. If you want the fastest temperature changes around, there’s no way to beat direct contact between your pan and your stove.

Finally, using this product on high heat will discolor and eventually damage it. As long as you don’t mind your diffuser being a bit brown in the center, this won’t be a problem for months or years. This device is also crazy cheap, so it’s not really a big hassle to replace.

If you want to try out a heat diffuser for your glass top stove, the HIC Heat Diffuser Simmer Plate is a top pick. It’s incredibly cheap, made from the right materials, and has a smooth side that won’t scratch your stove. Don’t forget, it’ll also help spread heat out evenly to your pots and pans.

* VonShef Stainless Steel Induction and Gas Hob Heat Diffuser

This heat diffuser is designed to work with induction stoves. It’s got an aluminum middle for heat distribution, but the real power comes in the stainless steel that encapsulates the aluminum disk. Because this steel is magnetic, your induction cooktop can energize it and bring it up to the temperature of your choice. It then propagates heat through the aluminum disk and into your cookware.

vonshef, vonshef gas stovetop heat diffuser ring plate, vonshef gas stovetop heat diffuser ring plate reviewAs far as glass stove use is concerned, this diffuser checks off all the boxes. It’s not made of ceramic, enamel, porcelain, or glass, so it’s safe to put on your stove. The bottom is totally flat, meaning you don’t have to worry about cracks or chips. It’s also got an aluminum core, which helps ensure that heat gets distributed as quickly and evenly as possible.

There are two downsides to this model. First, induction interface disks don’t really work. They’ll get hot, sure, but they do so inefficiently and they don’t actually transfer as much heat to your cookware as you’d like them to. You should use this disk only as a temporary solution until you buy magnetic cookware that works directly on your range.

Second, the addition of stainless steel makes it less thermally transparent than an all-aluminum heat diffuser. This means that you’ll take a bigger hit to the performance of your stove if you’re just using this to protect the glass surface. While you’ll be able to use your rough-bottomed cast iron cookware safely, it’ll also take longer to heat up. For some people, this tradeoff isn’t worth it.

VonShef’s Stainless Induction Diffuser is a wonderful product if you want to use your old cookware on your new stove. While it’s not an effective permanent solution, it can protect your stove and allow the use of non-magnetic cookware on an induction cooktop. The flat surface will protect the glass top of your stove and prevent it from making contact with cookware that’s too dangerous to use. It’s a great way to extend the life of your cookware a little bit or enable you to use one or two pieces that you don’t want to replace.

* Cooks Innovations SimmerMat Heat Diffuser

cooks innovations simmermat heat diffuser, cooks innovations simmermat heat diffuser review, cooks innovationsWhile the other two heat diffusers on this page try to spread out heat quickly, this one works to do the opposite. It’s made of a type of steel that doesn’t conduct heat very well at all. Since heat doesn’t flow through this diffuser very quickly, it helps prevent food from burning by acting as a barrier between your pot or pan and the burner.

Personally, I’m not a big fan of devices like this one. I prefer to take a more active approach to managing my burner heat. That said, this diffuser does make things a lot easier when you’re simmering something for a long time. It’ll even out the release of heat into your pan, meaning that you’ve got a much wider range of temperatures to work with.

As far as glass top stoves are concerned, this device will work wonders in enabling you to use rough-bottomed cookware or cookware that’s made out of a material that doesn’t go well with glass. It’s not a perfect tool for constant use, but you should find it more than adequate for the occasional simmer. If you want thermal responsiveness, however, you’ll definitely want one of the products above.

Can I Use Cast Iron On A Glass Top Stove?

Let’s dive right into the crux of things. Glass top stoves and cast iron cookware have gotten quite a lot more popular lately, and there are a lot of people who say that they don’t mix. What happens if you try to use cast iron on a glass top stove without a heat diffuser?

cast iron, cast iron pan, cast iron skilletThe truth is, there’s not a lot of consistent danger when it comes to using cast iron on your fancy flat-top stove. Cast iron is metal, which means it won’t scratch the hard glass of your stovetop unless there’s quite a lot of force. If you’ve got a cast-iron pan with a very smooth bottom, you should be able to use it on your glass-top stove with two caveats.

First, cast iron is very heavy. It’s pretty easy to accidentally drop a cast-iron skillet or pan onto a glass stove with enough force to crack the stove. It’s much harder to do this with steel or aluminum pans.

Second, cast iron can get really hot. This is one of the primary advantages of cast-iron, since you don’t want to heat most other kinds of cookware up to the kinds of temperatures you want for searing steak. These ultra-high cooking temperatures can get pretty dicey with the glass top of your stove, however, and they’re also very hard to control. If you’re not experienced at cooking with cast iron, you’ll want to limit your cooking to short bouts over low heat.

Of course, all of this theory talk is moot if using cast iron will void your warranty. Be sure you thoroughly understand how things work before putting “unsafe” cookware on your stove, no matter how safe the internet claims it is.

One final note: it’s especially important that the pots and pans that you use actually have smooth, metal bottoms. Non-metal materials (like ceramic or enamel) may melt and literally fuse with the glass on your stove. Non-flat bottoms will often cause chips or cracks in the surface of your stove. You may read somewhere that glass is harder than metal, so rough bottoms shouldn’t matter. This is true with regards to casual scratches, not serious cooktop damage. Use rough pans at your own risk.

How Do Heat Diffusers Change Things?

Heat diffusers act as a protective barrier between your cookware and the glass top of your range. This changes things in a fundamentally important way.

Heat diffusers act as glass cooktop protectors by providing a physical barrier. This means there’s no physical contact between your cooktop and the cookware you use. With no contact, rough bottoms and unsafe materials don’t matter anymore. Any damage will occur between the diffuser and your cookware, not between the diffuser and your range.

There is one exception to this: if you heat your diffuser to an absurdly high temperature it can cause all sorts of damage to your range. Be sure you don’t cook with more heat than you need and never heat up a diffuser without a pot or pan full of food on top of it. As long as there’s something to actually transfer heat to you should be fine.
cooktop protector, aluminum disk

Heat diffusers are also cheap and durable. While you can buy protective cooking pads for glass top stoves that are made out of heat-resistant fabric, these cooking pads don’t last very long. You’ll damage the fabric with each and every spill, even as you literally scorch it in between two pieces of hot metal. As a result, these pads become ugly with damage nearly instantly and will quickly become too worn out to be useful.

By contrast, metal heat diffusers are made of durable metal. They’ll easily hold up to repeated applications of high heat, and they won’t be ruined permanently should you spill a little bit of soup on them. They’re also pretty easy to clean in the sink.

This isn’t to say that metal heat diffusers will look flawless and shiny forever. They will discolor a little bit after repeated use over high heat. What it does mean, however, is that they’re very durable and should last for months or years with proper use. As I said earlier, they’re also fantastically cheap, so replacing them isn’t a big deal.

The Best Heat Diffuser For Your Glass Top Stove

Heat diffusers aren’t a flawless permanent solution for a cookware collection that’s entirely incompatible with a glass top stove. They are, however, brilliant temporary stopgaps that will let you occasionally use a rough bottomed pot or an enameled pan.

Since heat diffusers are incredibly cheap, there’s no reason not to pick one up and try it out for yourself! You’ll be able to use your favorite old cookware with your snazzy new stove without damaging anything.

How Do I Prevent Scratches On My Glass Stove Top?

Glass top stoves look chic, elegant, and beautiful, adding a contemporary element to any kitchen. One of their other advantages is that they are fairly easy to clean, but a major disadvantage is they are also easily scratched. Worse, many of these scratches occur during routine use. They can frequently accumulate scratches from all types of kitchen utensils, and not just cast iron cookware, and also from some abrasive cleaning products.

Even though a glass top stove is easier to keep clean, you need to take precautions to keep the surface from scratching. Scratches can get worse over time and lead to cracking, which is expensive to repair. When it comes to your glass top stove, the secret is not to get rid of scratches after they’ve occurred, but to prevent scratches from ever occurring in the first place. Here are our tips on how do I prevent scratches on my glass stove top?

The first step in preventing scratches on a glass top stove is to always wipe it down as soon as it gets any food or stains on it. Clean spills as soon as they’re cool enough to safely wipe away. Sugary spills, in particular, are infamous for causing pitting. If not, food or stains will set, making them more difficult to clean, so that you have to use a heavier hand leading to a greater risk of it scratching. Below we give more detailed tips on how to clean your glass top stove.

Never move pots and pans back and forth over the surface, always remember to lift them from the glass top without dragging them. Pots and pans dragging on the glass can leave deep scratches that are then almost impossible to remove. You should only use pots and pans with smooth bottoms while cooking on a glass top. The best type to use to prevent scratches are ones with stainless steel bottoms. Also, it’s very important to clean the bottoms of the cookware that you are using before setting them on your cooktop. This will remove any food particles stuck to the bottom that could damage and scratch your glass top stove. 

Another tip is to never place aluminum foil, kitchen tool, or utensil on the glass top directly. Foil can leave dark gray streaks and marks that are especially noticeable on white cook tops.

Lastly, there are glass stove top covers available that you can get to help protect the stove while it is not in use.

How Do I Clean My Glass Top Stove?

Keeping your glass top stove clean is the key to not only improving and maintaining its classy and contemporary look in your kitchen but also in preventing damage and scratches.  the glass with cookware. It is important to properly take care of it at all times, including when you clean it as well as cook on it. You may be wondering then, ‘how do I clean my glass top stove?’

Cleaning your glass cooktop is not just about hygiene and maintaining cleanliness and its attractiveness. It’s about protecting it from damage and scratches as well. The best way to achieve all of this is to make sure that you clean your glass top stove with what’s best described as ‘a light hand’. Don’t be too heavy and vigorous with your movements, even though it may be tempting to do so to save time, or if the surface is particularly dirty. 

Vital to that, is to wipe your glass top stove after every time you use it, to clean off food, crumbs, spills, and stains. Clean these as soon as they’re cool enough to safely wipe away. If not, crumbs, spills, and stains will set, making them more difficult to clean with the essential light hand. 

Only use a damp soft cloth to wipe down your glass cooktop for sparkling cleaning results with no scratches. It may sound obvious, but make sure that the cloth is clean and soft without any sharp edges or rough material covering it. Just as a kitchen utensil can scratch a glass cooktop, so can a rough dishcloth. If you need to use a cleaner, only use a cleaner specifically made for glass top stoves. Never use an abrasive and harsh cleaner. 

Lastly, keep the surface clean, even when not in use. The stove doesn’t have to be hot or in use for cooking for an item to scratch. Be aware of all ties of its easily damaged glass top. After all, it’s probably the centerpiece and pride and joy of your kitchen. 

These tried and trusted tips will be your saving grace in maintaining a beautiful glass top stove, sparkling clean and with no scratches whatsoever!

The right cookware can help maintain the longevity of your glass top stove: 


Peter's path through the culinary world has taken a number of unexpected turns. After starting out as a waiter at the age of 16, he was inspired to go to culinary school and learn the tricks of the trade. As he delved deeper, however, his career took a sudden turn when a family friend needed someone to help manage his business. Peter now scratches his culinary itch on the internet by blogging, sharing recipes, and socializing with food enthusiasts worldwide.

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