Infernus Heavy-Duty 20mm Griddle Review: 60, 90 and 120cm Gas Griddles

Last updated: October 2026

In 30 seconds:

• The Infernus heavy-duty griddle has a 20mm steel plate, the thickest in the Infernus range. It comes in 60cm, 90cm and 120cm widths.
• Prices start from £565 (60cm, 2 burners), £699 (90cm, 3 burners) and £849 (120cm, 4 burners).
• It ships set up for natural gas. An LPG conversion kit is in the box, and a Gas Safe registered engineer must convert it before you trade on propane.
• It is heavy: 52kg, 80kg and 135kg. Think fixed kitchen or large trailer, not a lift-out unit for a small van.

Every griddle cook knows the moment. A full load of frozen burgers lands, the sizzle fades, and the queue waits while the plate catches up.

A thick steel plate is the standard answer to that problem in busy commercial kitchens. The Infernus heavy-duty range is built around one. This review covers all three sizes: what you get, who each suits, and the two things buyers most often miss.

Infernus heavy-duty 20mm griddles at a glance

All three share the same design. You get a stainless steel body, a 20mm steel plate, separate manual burner controls, piezo ignition and thermocouple safety valves.

These figures come from the Infernus listings. The factory drawing for the 60cm matches its listed sizes. There is no full user manual for this range, so we only publish what the listings state.

Why no kW figure? The listings give a power output, but they do not say whether it applies on natural gas or on propane. Because the range ships set for natural gas, we have left heat input out rather than guess. Ask us before you plan your propane supply.

Heavy-duty or standard Infernus: what actually changes

We also sell the standard stainless Infernus griddles. Our Infernus LPG griddle review covers those four sizes in full. Here is how the heavy-duty range differs.

• Plate thickness: 20mm on the heavy-duty range. The standard 60cm and 75cm use a 12mm plate.
• Plate depth: the heavy-duty plate is 482mm deep. The standard 60cm and 100cm cooking areas are 400mm deep, so you gain about 8cm front to back.
• Weight: the heavy-duty 60cm weighs 52kg, against 36kg for the standard 60cm.
• Gas as supplied: heavy-duty ships for natural gas with an LPG kit. The standard range ships for LPG with a natural gas kit.
• Gas connection: a 3/4-inch NPT connection at the rear, against 1/2-inch on the standard range.

Heat recovery. A thicker plate stores more heat. When cold food lands, the temperature drops less and comes back sooner. That is the whole point of 20mm steel, and it is why the listing describes it as built for high-volume cooking.

The flip side. More steel also takes longer to come up to heat at the start of the day. Light it earlier than you would a thinner plate, and plan your opening around it.

Infernus heavy-duty 60cm: thick plate, small footprint

Quick specs

• Burners: 2 steel horseshoe burners, each with its own control
• Plate: 20mm steel, 600 × 482mm
• Machine size: 604 × 632 × 389mm
• Weight: 52kg (two-person lift)
• Price: from £565

Best for

A café or takeaway with a short bench that still gets a rush. It also suits a trailer that wants a second plate for eggs, onions or bacon beside a bigger griddle.

Trade-off

It costs £116 more than the standard 60cm, from £449. You are paying for heat retention and a deeper plate, not more width.

Infernus heavy-duty 90cm: the size most kitchens should start with

Quick specs

• Burners: 3 U-shape burners, each with its own control
• Plate: 20mm steel, 900 × 482mm
• Machine size: 904 × 632 × 389mm
• Weight: 80kg
• Warranty: 12 months, parts
• Price: from £699
• View the Infernus heavy-duty 90cm griddle

Best for

A busy breakfast café, burger bar or catering trailer with one main cook. Three burners give you three zones, so one end can hold cooked food while the other two sear.

Why we would start here

It gives you a working width for a real queue without the weight of the 120cm. It also costs only £20 more than the standard 100cm, from £679. That model has a narrower 400mm deep plate.

Infernus heavy-duty 120cm: for two cooks and a long queue

Quick specs

• Burners: 4 U-shaped steel burners, each with its own control
• Plate: 20mm steel, 1200 × 482mm
• Machine size: 1204 × 632 × 389mm
• Weight: 135kg
• Warranty: 12 months, parts
• Price: from £849
• View the Infernus heavy-duty 120cm griddle

Best for

A restaurant line, a large festival trailer or any set-up where two people work the plate side by side.

Worth knowing

At this width the price gap with the standard range almost disappears. The standard 120cm costs from £847, so the heavy-duty plate costs just £2 more. If your bench and floor can take it, that is strong value.

Don’t buy it for

• A small van. At 135kg it eats into your payload and needs a very solid bench.
• Steady, modest trade. A wide plate you never fill just burns more propane.

What you need before the first service

• A propane conversion. The griddle arrives set for natural gas. A Gas Safe registered engineer must fit the LPG conversion kit and check the burners before you trade on propane.
• Propane, not butane. Propane keeps working on cold mornings. Butane struggles to turn to gas in the cold.
• Regulator, hose and fittings. The listings do not include them, so budget for them. Tell your engineer it has a 3/4-inch NPT rear connection, so they bring the right adaptor.
• A strong, level bench. The 4-inch adjustable legs help you level it, but the surface must carry the weight.
• Ventilation. Fit it in a well-ventilated kitchen, van or trailer. A Gas Safe registered engineer must install it.

New to running a griddle on propane? Our guide to setting up and using an LPG griddle in a food van walks you through the first service.

The biggest mistake: treating it like a lift-out griddle

Most heavy-duty regrets come down to two things. The first is trading before the propane conversion is done. The second is weight.

A natural gas griddle on a propane supply will not burn properly, and it is not safe. Book the engineer for the conversion before delivery day, not after.

Then check the weight against your bench and, in a trailer, your payload. The 90cm weighs 80kg and the 120cm weighs 135kg. Plan either one as a fixed fit that stays put. For daily care, the 2-inch deep oil tray sits at the front for emptying. Our guide on how to clean and season a commercial LPG griddle covers the plate itself.

The honest limits. Heat is set by hand with a knob for each burner, not by a thermostat. The warranty on the 90cm and 120cm is 12 months, parts. If you want thermostatic control or a longer warranty, our best LPG griddle buying guide compares the Parry and Lincat options side by side.

Fitting out a whole kitchen or trailer? Lease finance lets you buy and pay over time on orders over £1,000.

Our verdict

Buy the heavy-duty range if your griddle faces long rushes of cold or frozen food. The 20mm plate holds its heat better than a thinner one.

For most busy kitchens and large trailers, the 90cm is the one to start with. Choose the 120cm for two cooks, and the 60cm when bench space is tight. Stick with the standard Infernus if you need a lighter unit that ships ready for LPG.

Frequently asked questions

Is the Infernus heavy-duty griddle LPG or natural gas?

It ships set up for natural gas, with an LPG conversion kit in the box. For a food van, trailer or event, it must be converted to run on propane before you trade. This is the opposite of the standard Infernus griddles, which ship ready for LPG.

Who should convert the heavy-duty griddle to propane?

A Gas Safe registered engineer. Converting a gas appliance from natural gas to propane is not a DIY job. The engineer should install and test it at the same time. Book them before the griddle arrives, so it is ready on your first trading day.

What is the difference between the heavy-duty and standard Infernus griddle?

The heavy-duty range has a 20mm steel plate, while the standard 60cm and 75cm use 12mm. The heavy-duty plate is also deeper, at 482mm against 400mm, and the units are heavier. The heavy-duty range ships for natural gas, and the standard range ships for LPG.

How heavy is the Infernus heavy-duty 120cm griddle?

The 120cm has a net weight of 135kg. The 90cm weighs 80kg and the 60cm weighs 52kg. Plan the 90cm and 120cm as fixed fits on a strong, level bench. In a trailer, check the weight against your payload before you order.

Does a 20mm griddle plate take longer to heat up?

Yes. A thicker plate holds more steel, so it takes longer to reach cooking heat at the start of the day. The benefit comes later: it stores more heat, so it drops less and recovers sooner when a load of cold food lands on it.

Is the Infernus heavy-duty griddle thermostatic?

No. Each burner has its own manual control, so you set the heat by hand rather than to a temperature. That gives you separate zones, for example searing at one end and holding at the other. For thermostatic control, look at the Parry PGG6P or Lincat GS7/P.

What gas connection does the heavy-duty griddle have?

All three sizes have a 3/4-inch NPT gas connection at the rear. NPT is an American thread, so tell your Gas Safe registered engineer before the visit. They can then bring the right adaptor, regulator and hose, which the listings do not include.

Which size heavy-duty griddle should I buy?

For most busy kitchens and large trailers, the 90cm with 3 burners is the best starting point, from £699. Choose the 120cm, from £849, if two cooks share the plate. Choose the 60cm, from £565, for a short bench or a second plate.