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A heat diffuser sits between the pan and a glass or ceramic cooktop to spread heat evenly and protect the glass from thermal shock and scorching – useful for cast iron, thin pans, and anything simmered low and slow. Six real diffusers below, from budget perforated plates to a larger foldable-handle model.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Norpro 144 Heat Diffuser | $8-$12 | Amazon |
| 2 | Fox Run Heat Diffuser (#5068) | $6-$10 | Amazon |
| 3 | Fox Run Stove Ring (#5686) | $8-$12 | Amazon |
| 4 | SimmerMat Heat Diffuser (Cooks Innovations) | $10-$15 | Amazon · eBay |
| 5 | Cooktop Solutions 9.45-Inch Stainless Steel Heat Diffuser | $15-$20 | Amazon · eBay |
| 6 | HIC Simmer Plate | $6-$10 | Amazon · eBay |
The picks, in detail
Norpro 144 Heat Diffuser
The long-running, widely stocked simmer plate from Norpro – a flat perforated metal disc with a removable wood handle.
- Stainless steel construction
- Removable wood handle
- Fits most standard burners
- Cheap and widely available
- Wood handle stays cool to the touch
- Users report it can scratch a glass cooktop if slid rather than lifted, due to the perforated underside
Fox Run Heat Diffuser (#5068)
Fox Run’s flat perforated diffuser, a straightforward budget option that adds a buffer layer between burner and pan.
- Perforated stainless steel plate
- Compact flat design
- Dishwasher safe
- Simple, no-frills protection for glass cooktops
- Inexpensive
- No handle – lift with a pot holder
Fox Run Stove Ring (#5686)
A ring-style diffuser from the same brand, sized to sit under a smaller pot rather than covering the full burner.
- 5-inch stainless ring
- Lightweight
- Fits gas and glass-top ranges
- Good fit for smaller pans where a full plate diffuser is oversized
- Small size means less coverage for large pots
SimmerMat Heat Diffuser (Cooks Innovations)
A steel-plate diffuser marketed specifically for reducing heat output evenly across gas and electric ranges, including glass tops.
- Steel plate construction
- Dishwasher safe
- Works on gas and electric/glass ranges
- Reliable, consistent heat spread for slow cooking and melting
- Easy to clean
- Flat design, no handle for quick removal
Cooktop Solutions 9.45-Inch Stainless Steel Heat Diffuser
A larger 9.45-inch stainless plate with a foldable handle, aimed at covering bigger pans evenly.
- 18/8 stainless steel
- 9.45-inch diameter
- Foldable handle for storage
- Larger surface than most competitors, better for big pots
- Foldable handle saves drawer space
- Larger size takes up more storage than a compact diffuser
HIC Simmer Plate
A perforated stainless simmer plate from HIC Kitchen with a removable cool-touch handle, positioned as a reliable everyday option.
- Perforated stainless steel
- Removable, cool-touch handle
- Stores flat
- Cool-touch handle makes it easy to move mid-cook
- Perforated design distributes heat evenly
- Similar scratch caution as other perforated designs if dragged across glass
Buying tips
- Lift, don’t slide, any perforated-bottom diffuser across a glass cooktop – the raised perforations are what can scratch the glass over time.
- A flat, smooth-bottomed diffuser is gentler on glass than a heavily perforated one, at the cost of slightly less even heat spread.
- Diffusers help most with delicate, slow-cooked foods (rice, oatmeal, melted chocolate, gravies) – for searing or boiling, skip it and cook directly.
- Match the diffuser size to your pan, not your burner – a diffuser noticeably larger than the pan wastes heat around the edges.
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