The Ooni Karu 12 manual covers the multi-fuel Karu 12, model UU-P0A100, which burns wood or charcoal in its standard burner. The key rules are outdoor use only, at least 30 minutes of red-hot burn-in before the first cook, and at least 2 hours of cool-down after use.
Read the safety section before you assemble or light the oven. The lighting steps are short, but the fuel and heat rules matter most for every cook.
This summary follows the manufacturer’s manual and does not replace it. Read the full manual before your first use.
What the Ooni Karu 12 Manual Covers
The Ooni Karu 12 manual, model UU-P0A100, covers safety, assembly, lighting and extinguishing for the multi-fuel oven. The standard burner takes wood or charcoal, and a gas burner is fitted as an add-on. That makes the Ooni Karu 12 manual the place to check whether a step applies to wood and charcoal or to the optional gas burner.
The Ooni Karu 12 manual opens with a full safety disclaimer, followed by what is in the box, assembly, and lighting and extinguishing.
If you are looking for Ooni Karu 12 instructions, the parts that affect daily use are the safety rules, the lighting sequence, the fuel rules and the cool-down period. Those are covered in the sections below.
Use the printed manual alongside this guide. Every temperature, size and fuel rule above comes from the manufacturer’s text, so if your copy differs in any detail, follow the copy you hold and check with Ooni support. If you would rather cook on an electric countertop oven, the Breville Pizzaiolo manual guide covers that model.
Safety Rules to Read Before First Use
The Karu 12 is for outdoor use only, and the manual rules out indoor, garage, boat and RV use. It also says not to use the oven in high winds, and to keep it clear of flammable materials and liquids.
- Never use the oven indoors, in a garage, or on a boat or RV.
- Do not use it in high winds.
- Keep children, pets and combustible items away at all times.
- Touch only the wooden or plastic handles, because metal parts get hot during operation.
- Expect an operating range of about 250 F (120 C) to 1000 F (550 C).
The Ooni Karu 12 manual says only responsible adults should use the oven, and that metal parts are too hot to touch while it operates. See whether a pizza oven can stay outside before you decide where it lives between cooks.
Assembly and Setup Steps
The Karu 12 must be fully assembled before you light it, with every part securely fastened and tightened. The gas burner is an add-on that is fixed in place with the included Allen key.
Follow the assembly steps in the order the Ooni Karu 12 manual lists them. The manual also suggests storing the Allen key underneath the oven, so it stays with the oven between cooks.
Before you start, lay out every part and check it against the list in the box. If you want the size first, the Ooni Karu 12 dimensions page has the numbers. Missing or damaged parts should be sorted out before the first light, not during a cook.
Check the assembly once more after you move the oven, since loose parts are a safety risk when the oven is hot.
How to Light the Karu 12 With Wood or Charcoal
To light the Karu 12 with wood or charcoal, open the chimney and ceiling vents, remove the hatch, and start a layer of charcoal or a small wood stack. Then let the oven preheat for 10 to 20 minutes.
- Remove the chimney cap, open the chimney and ceiling vents, and attach the required door.
- Remove the hatch and place a layer of charcoal or a small stack of wood in the burner.
- Light the fuel with a firelighter that complies with EN 1860-3.
- Once the fire is going, add more fuel slowly.
- Replace the hatch and let the oven preheat for 10 to 20 minutes.
- Add more fuel as needed to keep the fire going.
The Ooni Karu 12 manual lighting section sets out the full sequence and the fuel rules in one place, so check it before your first light. Check the current manual on Ooni’s support site for the exact wording, since this guide follows model UU-P0A100.
Preheat times vary with the fuel and the weather, so treat the 10 to 20 minute range as a starting point and check the oven before you cook.
First Use Burn-In and Operating Temperature
Before the first cook, the manual says to keep the fuel red hot for at least 30 minutes, and not to cook until the fuel has an ash coating.
| Stage | What the manual says |
|---|---|
| First use | Keep the fuel red hot for at least 30 minutes |
| Before cooking | Wait until the fuel has a coating of ash |
| Operating range | About 250 F (120 C) to 1000 F (550 C) |
The range in the Ooni Karu 12 manual is a guide, not a setting you can dial in; for wood and charcoal heat levels in general, see wood pizza oven temperature and charcoal pizza oven temperature. Check the temperature with a thermometer before you put food in, and adjust the fuel to suit the cook. Treat the burn-in and the ash coating as required steps rather than optional ones, because they come straight from the manual’s first-use rule.
Fuel Rules: Wood, Charcoal and Firelighters
Use dry, untreated hardwood up to 20 cm (8 inches) long and 4 cm (1.5 inches) across, and only charcoal that is suitable for cooking.
- Wood: dry, non-treated hardwood, up to 20 cm (8 in) long and 4 cm (1.5 in) in diameter.
- Charcoal: only charcoal that is suitable for cooking.
- Firelighters: only those that comply with EN 1860-3.
The Ooni Karu 12 manual bans spirit and petrol for lighting or relighting. Keep the fuel away from the oven when it is hot, and never add fuel that is treated or painted.
Extinguishing, Cool-Down and Storage
To put out the Karu 12, let the fire burn down on its own, then leave the oven to cool for at least 2 hours before you cover or store it.
- Stop adding fuel and let the fire burn down naturally.
- Leave the oven to cool for at least 2 hours.
- Remove the ashes only after the oven has cooled completely.
The Ooni Karu 12 manual warns that the oven stays hot after the flames die down, so do not cover it straight after use. Make sure all fire and glowing embers are gone from the burner before you store it, and keep children and pets away while the oven cools, since the manual says to keep them away at all times.
If you use the gas burner and the flame goes out, the manual says to turn off the gas supply, remove the door and wait 5 minutes before relighting.
Frequently Asked Questions
Is the Ooni Karu 12 safe to use indoors?
No. The Ooni Karu 12 manual says the oven is for outdoor use only and must never be placed inside a building, a garage or any enclosed area. It also rules out boats and recreational vehicles, so keep it in an open outdoor space.
How long should I preheat the Karu 12?
The Ooni Karu 12 manual says to preheat for 10 to 20 minutes after you replace the hatch, adding more fuel as needed. Check the oven before cooking, because the fuel and weather change how long it takes.
How hot does the Karu 12 get?
The Ooni Karu 12 manual gives an operating range of about 250 F (120 C) to 1000 F (550 C). Treat the range in the Ooni Karu 12 manual as the operating limit, and check the temperature before you cook.
Can I light the Karu 12 with lighter fluid?
No. The Ooni Karu 12 manual says not to use spirit or petrol for lighting or relighting. Use only firelighters that comply with EN 1860-3, and keep lighter fluid away from the oven.
How long should the Karu 12 cool before storage?
Allow at least 2 hours after use before you cover or store the oven. Remove the ashes only once the oven has cooled completely, since it stays hot after the flames die down.
Does the Karu 12 need a gas burner?
No. The standard burner takes wood or charcoal, and the gas burner is an add-on that you fit with the Allen key. The gas burner is optional for anyone who only plans to cook with wood or charcoal.
Store the oven in a dry, sheltered spot once it is fully cold, and keep it clear of combustible materials. If you cannot give the Karu 12 a full cool-down or a clear outdoor space, a different oven may suit you better, and the by use and model guides cover other options.