A practical comparison
First-generation Karu 12 or Karu 2? Check the fuel setup
Ooni’s first-generation Karu 12 and second-generation Karu 2 are both 12-inch outdoor multi-fuel ovens, but they are not the same operating kit with a cosmetic refresh. If your essential need is a 12-inch pizza with wood or charcoal, either can fit. The important questions are how much weight you want to lift, whether a temperature reading or viewing door matters, and which exact burner setup you will use.
Start with the operating version, not the shared name
| Question | Karu 12, first generation | Karu 2, second generation |
|---|---|---|
| Standard pizza size | 12 inches | 12 inches |
| Published oven weight | 26.5 lb | Just under 34 lb / about 33.7 lb in Ooni's current specification |
| Built-in temperature display | No; Ooni suggests a separate infrared gun for stone-surface readings | Analog oven thermometer |
| Viewing door | Removable door supplied; not a closed glass viewing door | Borosilicate-glass viewing door |
| Wood or cooking charcoal | Supplied tray, grate and hatch | Supplied solid-fuel tray |
| Propane option | Exact compatible burner is required; door off and chimney on | Exact compatible burner is required; glass door may be used closed |
These are the manufacturer’s listed package and use details, not a side-by-side cooking test. Ooni advertises both ovens at high pizza temperatures, but that claim does not tell you how a particular fire behaves in your weather, how quickly your stone recovers between launches or what result your dough will produce.
Portability versus information at the oven
The first-generation Karu 12 is the lighter of the pair at 26.5 pounds, while the Karu 2 is listed at just under 34 pounds. The difference is meaningful if you regularly carry an oven to storage, a patio or a campsite, though neither weight includes the work surface, fuel or other cooking gear. Both remain open-air fire appliances: portability does not make them indoor ovens, and the first-generation manual warns against operation in high winds or without supervision.
The Karu 2 adds a built-in analog oven reading and a glass door that lets you observe the bake with less need to open the mouth. The first-gen has no built-in thermometer; an infrared thermometer can read the stone when bought separately, but it is not continuous oven monitoring. If your questions require a local display or phone monitoring with no extra purchase, the Karu 2 changes the answer. If lighter carry weight is more important and you are comfortable learning the live-fire routine without an onboard reading, the original Karu 12 makes more sense.
Propane is where generation matters most
“Multi-fuel” does not mean that a propane regulator and burner are supplied in both standard boxes. The official burner is a separate compatible part unless you choose a current package that explicitly includes it. It runs on bottled propane, not a household natural-gas line. More importantly, Ooni’s current burner page says the first-generation Karu 12 must operate with its door off and chimney on. The second-generation Karu 2 can use its glass door closed with the same compatible burner. Treat that as a real setup difference, not a shortcut to skip the generation-specific instructions.
For the gas version, the US/Canada burner manual gives mixed clearance statements: 24 inches at the sides and 36 behind, another 40-inch instruction, and a warning against use within 10 feet of structures, combustibles or another cylinder. Until Ooni clarifies the exact placement for your setup and local code, don’t plan a close-fit station from the smaller figures. The solid-fuel manual does not give a numeric clearance in the copy reviewed here, so a finder requiring a measured clearance cannot assume one. Follow the exact current manual for the selected version.
Keep the cooking job in perspective
Neither oven is a large multi-pizza deck: both have a 12-inch stone and call for one pizza at a time. For a 14-inch pie, two simultaneous 12-inch pizzas or a larger party workflow, look beyond this pair. Karu 2 Pro has a wider 16-inch pizza floor and adds a supplied digital temperature hub and food probe, but its published body weight is around 63 pounds, so the extra size and monitoring are not a free portability upgrade. A factory propane oven such as Koda 2 may be simpler if you do not want to swap burners; an indoor electric oven is the appropriate route when the location itself is indoors.
For exact operation and package contents, read the Karu 12 product page, the official Karu 12-compatible burner details, and the correct first-generation Karu 12 manual or US/Canada gas-burner manual. Then choose based on your actual carrying, monitoring, fuel and clearance needs—not the shared 12-inch label alone.