Ooni Karu 2 Multi-Fuel Outdoor Pizza Oven, 12 inch: Specs, Sizes and Who It Suits

The Ooni Karu 2 Multi-Fuel Outdoor Pizza Oven, 12 inch is a wood or gas oven in the 12 inch class with a 13.2 in round cooking surface. Everything below is drawn from published manufacturer specifications and verified owner reports. Where a figure is not something we can stand behind, the row is left out rather than filled with a plausible guess.

The Karu 12 with the two upgrades that make wood firing repeatable rather than a guessing game: a hinged glass door you can see the fire through without opening the oven, and an integrated thermometer reading the stone. Wood firing goes wrong because you cannot see what the fire is doing and cannot tell what the floor is doing. This addresses both. The cooking capability is otherwise unchanged from the model it replaces.

What are the Ooni Karu 2 specifications?

Rows omitted because we have not verified a figure we would be willing to publish: weight. A specification page that guesses is worse than one with gaps in it, so the gaps stay.

What is it good at?

• A hinged glass door, so you can watch the burn and the pizza without dumping the chamber heat every time you look.
• Integrated stone thermometer, which is the single most useful instrument on a wood-fired oven.
• Still takes gas, so the weeknight fallback survives.
• Better sealed than the Karu 12, so it holds a soak and uses fuel a little more efficiently.

What are its real limitations?

• Considerably more expensive than a Karu 12, for improvements to control rather than to peak performance.
• The glass needs cleaning, and soot on it defeats the point of having it.
• Still a 12 inch chamber with an 11 inch practical pizza.

Who should not buy it: Skip it if you already own an infrared thermometer and are comfortable managing a fire by eye, because those are the two problems it solves. A Karu 12 plus a good thermometer costs less and cooks the same pizza.

How does the fuel type change how you use it?

Wood or gas, with the door improving the draw enough that the fire holds more steadily than in the open-mouth models. The same fuel rules apply: kiln-dried hardwood only, never treated timber or heating pellets.

Multi-fuel is the hedge, and it is a sensible one. Most people who buy a wood oven discover that they want wood on a Saturday and gas on a Wednesday, and an oven that does both means that discovery does not cost a second purchase. The honest caveat is that the burner is usually sold separately, so compare the true two-fuel price rather than the sticker price when you are weighing it against a gas-only oven. Our fuel guide covers what to burn and what never to burn.

What dough suits this oven?

Being able to read the floor precisely means you can commit to a tighter formula. A 60 percent hydration 00 dough on a confirmed 900F floor produces the classic 90 second bake with leoparding, and you no longer have to hedge upward on hydration to protect against an unknown temperature.

At a floor temperature of 850F or above, a 12 inch pizza bakes in 60 to 90 seconds and has to be turned three or four times, because one edge scorches in roughly 20 seconds.

Work the exact weights out rather than scaling a recipe by eye. The hydration calculator turns a ball count and a hydration percentage into flour, water, salt and yeast to a tenth of a gram, and the ball weight calculator sizes the balls for the pizza this oven can actually cook. Dough weight scales with area, not diameter, so a 15 inch pizza needs 78 percent more dough than a 12 inch, not 25 percent more.

What does it need alongside it?

Keep a dry brush for the glass and clean it while the oven is cool. The ash rake and long-handled brush are still required, since the coal bed still needs moving between bakes.

Three things are close to mandatory for any oven in this class. An infrared thermometer , because the floor temperature is the number that decides the bake and no built-in gauge measures it reliably. A turning peel , because a pizza has to be spun during the bake and a launching peel cannot do it. And a digital scale , because every dough figure on this site is a weight and none of them can be measured by volume.

Safety, and this is not boilerplate. This oven burns fuel and is for outdoor use only. At working temperature the floor is between 700F and 950F and the shell will burn skin on contact. Keep it at least three feet from fences, walls, awnings and overhanging branches, use long-handled tools and EN407 rated heat gloves , keep children and pets well back, never move a lit or hot oven, and never pour water on a hot baking stone. Water flashes to steam instantly and the thermal shock cracks stone.

How does it compare with the alternatives?

Three ovens worth weighing against it, chosen because they are the ones people actually cross-shop rather than the ones with similar prices.

• Ooni Karu 12: Anyone who wants wood-fired flavour and fire management as part of the hobby, without giving up a weeknight option.
• Ooni Karu 2 Pro: Committed wood cooks who want 15 inch pizzas and are building a permanent outdoor cooking station.
• Gozney Roccbox: Almost everybody. It is the single most defensible first oven for a household of two to five.

Which comparisons cover this oven?

A head-to-head is usually a faster read than a specification table, because it puts the trade-off in one sentence instead of two columns. These name the Ooni Karu 2 directly, and the rest cover the category decisions that apply to it.

• Ooni Karu 12 vs Ooni Karu 2
• Ooni vs Gozney, brand against brand
• Gas vs wood fired pizza ovens
• Charcoal vs wood in a multi-fuel oven
• Kiln dried logs vs wood pellets
• Indoor vs outdoor pizza ovens
• Home oven steel vs outdoor pizza oven
• 12 inch vs 16 inch pizza ovens

Where does it fit in a complete setup?

An oven on its own does not make pizza. The full kit is the oven, a baking surface if the supplied one is thin, a launching peel, a turning peel, a thermometer, dough containers, a scale, a cutter, fuel, and the items nobody thinks about until they are missing: gloves, a brush for the stone and a cover if it lives outdoors. We have costed that out completely at three budgets on the build pages, and the intermediate build is the one that suits most households.

If you are still choosing rather than confirming, the pizza oven roundup covers the whole category by tier, the oven index lists every model we track with its specifications, and the buying guide works through the decisions in the order they actually get made: fuel, then size, then budget.