Ninja FlexFlame Gas BBQ & Outdoor Cooking System review: Ultra-flexible barbecue blends the convenience of gas with real wood-smoke flavours

Seeing as both the Ninja Woodfire Electric Outdoor Oven and Electric Smoker went down extremely well at T3 Towers, we have been chomping at the bit (or should that be burned sausage?) to have a go with Ninja’s take on a propane grill.

But like the two aforementioned five-star items, Ninja cleverly pairs its expertise in electricity with the support of propane gas to create what it claims to be a true 5-in-1 outdoor cooking solution that’s just as happy banging out burgers and searing steaks as it is slow-roasting an entire bird.

The premise is relatively simple: it fuses a standard three-burner system with a cyclonic fan that gets the unit up to temperature in record time, as well as circulating heat and smoke evenly around the food inside. Flavoured smoke comes courtesy of a small pellet burner that sits next to the unit, which pumps out smoke for the fan to draw in and swirl around the culinary masterpiece for genuine barbecue flavours.

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Ninja’s claim of 5-in-1 versatility also comes from the fact that it will sell you a pizza stone and flat-plate or plancha griddle separately, which adds a further three cooking methods to the existing grill, smoke and roast functions.

It’s a handsome unit, available in four colours (the blue and green look the smartest), but it’s not exactly cheap and, as you'll see in this review, it takes a fair amount of assembly to get it set up. But before I give anything away, here's my full Ninja FlexFlame review.

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Ninja FlexFlame review: price and availability

In the UK, the Ninja FlexFlame currently costs £999.99 / $999.99, but this is for just the barbecue itself. Ninja throws in a small bag of wood pellets for free, which is enough for one cook.

There’s also a 5-in-1 bundle, which is very much worth the extra money, as it includes a plancha grill surface, pizza stone, pizza peel and a waterproof cover — important if you want the FlexFlame to stay looking fresh after a few winters.

This bundle is currently priced at £949.99, down from its original RRP of £1,249.99, although the items can all be purchased separately.

It is worth noting that you’ll need patio gas to run it, as well as access to mains power, although it will work if you happen to have portable power stations, such as those from EcoFlow and Jackery, which are capable of delivering DC output.

Ninja FlexFlame review: design and build

The Ninja FlexFlame arrives in an enormous box, which will require at least two people to lift into position. While the stand and panels aren’t particularly heavy, the main cooking grill weighs a ton, so you’ll need to rope those friends back in when it comes time to build.

For me, this was the most annoying part, as constructing the FlexFlame is akin to embarking on a complicated Ikea flat-pack project — the instructions are clear and simple, but set aside around two hours to get it done. There’s also a lot of packaging to store or get rid of afterwards.

Once built, it’s a handsome-looking thing and most of the surfaces feel robust and well made. The brass-coloured handle for the grill lid is a nice touch and the digital display for the precision burner control is easy to read in the sunshine.

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If I was to get picky, the metal used for the side-mounted prep tables and front doors feels thin and flimsy, while the plastic dials would look and feel much better if they were made from something more robust.

As previously mentioned, it is well worth heading out to purchase a cover, as I am not convinced it wouldn’t start rusting after a few torrential downpours. Similarly, the half- or full-griddle optional extras feel like essentials, as the gaps in the metal grill surface are large enough for kebabs and other smaller food items to easily fall between.

Alternatively, you can save a bit of money and pick up some inexpensive non-stick grill mats, which do a very similar job to a plancha for a fraction of the price.

Ninja FlexFlame review: performance and features

The first thing to hit any new owner is just how fast the FlexFlame gets up to temperature, with Ninja suggesting a 10-minute pre-heat, but it can be far less if you’re happy not cooking on a molten 315°C searing surface.

Once plugged into the mains (or portable power, like I had to while my patio was being ripped up), it’s simply a case of selecting from the pre-set cooking modes via the precision burner dial. These include roasting or baking, low-and-slow cooking, and grilling or searing.

There’s further control over the temperature via a dedicated temperature dial, while the digital read-out indicates which gas burners are active. This is another clever and well-thought-out feature, as it allows for precise, slow roasts with the middle burner deactivated in bake or roast mode to ensure outer layers or skins of meat aren’t burnt to a crisp.

It’s also possible to cook with just the front two burners running, allowing vegetables and other more delicate foodstuffs to cook slowly at the rear.

During one cook-out, I placed some fresh corn on the top rack, well away from the grill surface itself, and, over the course of a full BBQ session (chicken, pork belly and some burgers, yum), it was beautifully soft with a tasty exterior crunch (yummier).

The woodfire smoker box also allows budding chefs to inject more flavour, with plenty of control over how much smoke is entering the cooking chamber. Simply fill the small hopper with Ninja-approved pellets, hit the big button and wait around 10 minutes for it to ignite.

It generally kicks out a lot of smoke and you’ll need to leave the lid down to get the most out of these aromatic flavours (the cyclonic fan automatically shuts off when the lid is opened anyway), but it’s potent enough to give a light woodfire hint to burgers, steaks and chicken when grilling.

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Set the FlexFlame to low-and-slow or roast mode and the charring really penetrates the meat or vegetables that you have in there. I roasted a whole chicken one Sunday with Ninja’s All-Purpose Blend pellets and the meat was delicious — a rich, smoky flavour to the crispy skin, but with fantastically moist meat underneath.

The possibilities are near endless when it comes to cooking an array of food in a variety of styles and, while it is difficult to beat a real charcoal barbecue, the addition of these woodfire pellets aims to make up for some of the shortcomings.

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Ninja FlexFlame review: verdict

The Ninja FlexFlame is incredibly easy to use and works brilliantly as a standard outdoor gas grill, but it also makes up for its lofty price tag with the ability to cook in multiple ways.

More adventurous chefs can spend hours slowly smoking an entire pork shoulder, while family pizza night is dead simple if you throw a pizza stone onto the surface.

Simply because it ignites and heats up so quickly, I found myself using it whenever the weather was good enough to cook outdoors. It’s very easy to clean, requiring only a quick scrub of the enamel-coated cast-iron grates and the occasional emptying of the included fat tray, which can also be tossed in the dishwasher.

In essence, it takes everything that’s brilliant about Ninja’s electric barbecue grill and smoker technology and beefs it up with a 425-square-inch cooking surface and the ability to open the lid and cook just like you can on a good old-fashioned gas grill.