6 Best Heat Diffusers for Glass Cooktops of 2025

Glass cooktops are a sleek and modern addition to any kitchen, but they often present challenges like uneven heat distribution and localized hotspots that can spoil your meal.

If you’ve struggled with scorched food or inconsistent simmering, a heat diffuser for a glass cooktop is an essential tool designed to protect your cooktop, distribute heat evenly, and dramatically enhance your cooking experience.

After evaluating over 15 models, we identified the best heat diffusers that excel in durability, performance, and convenience.

Our top picks primarily feature multi-layered materials like stainless steel and aluminum to ensure even heat distribution and prevent scratches. Ready to perfect your simmering? Keep reading to discover the best solutions for your kitchen.

1. Best Budget Friendly: Stainless Steel Heat Diffuser w/ Handle

The Stainless Steel Heat Diffuser w/ Handle is an excellent budget-friendly option that unlocks gentle simmering and precise low-heat cooking on glass or electric cooktops.

Its smart foldable handle is a standout feature, making storage incredibly convenient and addressing a common pain point in smaller kitchens.

The unit’s robust three-layer construction, featuring a stainless steel exterior and an aluminum core, ensures efficient heat transfer and durability, effectively addressing issues like scorching and uneven hot spots.

The 9.45-inch diameter provides a solid surface for even heating, particularly when using smaller pans that may otherwise struggle to heat consistently on larger burners.

This model offers core functionality and a clever storage solution. Limitations: It is important to note that this diffuser is not designed for use on gas stoves.

2. Best for Moka Pot: Grouarty Stainless Steel Diffuser

Master delicate cooking tasks on your induction, electric, or glass cooktop with the Grouarty 11inch Heat Diffuser.

Engineered with a three-layer stainless steel and aluminum core, this plate is specifically designed for extremely even heat distribution and boasts a NO WARPING guarantee, which is a critical factor for long-term performance.

Measuring a substantial 11 inches, its primary strength lies in enabling the successful use of small cookware, such as Moka pots, espresso makers, butter warmers, or tea pots, preventing scorching and allowing for fantastic simmering results.

It effectively eliminates hot spots, ensuring consistent cooking across the entire pan base. For added convenience, the unit is dishwasher safe for easy cleanup after use.

This durable build is ideal for users who frequently use compact pots and pans and demand a robust diffuser that won’t deform over time.

3. Best for Simmering: HIC Kitchen Heat Diffuser

Achieve perfectly controlled simmering and prevent scorching on virtually any stovetop, including glass cooktops, with the HIC Kitchen Heat Diffuser.

This tool is specifically engineered to reduce and distribute heat evenly, transforming hot spots into a consistent cooking surface.

With an 8.25-inch plate diameter, this diffuser is highly effective at slow simmering sauces and other delicate foods, preventing boiling over or burning.

It is made from a combination of stainless steel, chrome-plated steel, and plastic, built to be sturdy and durable without scratching your cooking surfaces.

A unique benefit is its ability to help keep pan handles from getting hot. The included stay-cool handle is also easily removable for compact storage.

Though it has a simpler construction compared to multi-layer diffusers, it offers broader compatibility across electric, gas, and glass stovetops and excels in its core function of simmering control.

4. Best for Gas Stoves: CALIDAKA Heat Diffuser Plate

Experience consistently even cooking results across multiple stove types, including glass cooktops and gas stoves, with the CALIDAKA Heat Diffuser Plate.

Featuring a robust three-layer construction with a prominent aluminum core, this diffuser excels at spreading heat out over the entire plate, preventing burning or overcooking in specific areas. Its versatility makes it suitable for long-time stewing and simmering.

Available in practical 9 or 11-inch sizes, it is well-suited for various cookware, including smaller items like milk pans and Moka pots.

A highly notable feature is its ability to collect heat and continue heating after the heat source is turned off, promoting energy saving and keeping food warm.

This broad multi-stove compatibility combined with its unique heat preservation capability distinguishes it from single-focus alternatives.

It is an excellent choice for households using both gas and glass cooktops who value even heat distribution and added passive warming benefits.

5. Best for Quality: ACTIV CUISINE Heat Diffuser

Experience superior quality and controlled heat on your gas, glass, or induction cooktop with the ACTIV CUISINE 7.9 Inch Heat Diffuser.

Built with a high-quality, durable 3-layer construction (stainless steel and aluminum), this adapter is designed to transfer heat evenly to the bottom of the pot, which effectively avoids overcooking or burning.

It is particularly well-suited for long stews, promising to improve overall cooking quality. At 7.9 inches, this diffuser is more compact than many alternatives, making it ideal for smaller burners or specific tasks, such as heating coffee stoves or butter heaters.

It excels at protecting your cookware, preventing the bottom of pots and pans from turning black, and assists in keeping the hob clean.

This model emphasizes build durability and consistent performance in a smaller footprint. A key technical note: On induction cookers, this unit typically only supports the temperature function, not power level control.