It's portable, to the point it can be slung over a shoulder with the gas supply connected and stored inside, it's extremely stable and by using standard screw in canisters it's simple to source fuel.
What the manufacturers say:
Onja is our most compact two-burner stove. Thanks to the carrying strap the stove is easy to bring along and functions just as well on the city excursion to the park as on the weekend trip with the kayak. When extended the body becomes a stable cooking unit that also protects the burners from the wind. The top is covered with an oak lid that doubles as a cutting board or as a plate to serve food on. Powered by Primus 100 g, 230 g or 450 g canister gas. There is also a Duo valve version that fits most gas cartridges with a valve on the market, perfect for those who bring the stove with them when travelling.
Height (mm): 290
Width (mm): 140
Burn time: 34 min on 230 g gas (200 g/h per burner)
Length (mm): 430
Season: 3 Seasons
Effect (W): 2800x2
Weight (g): 3000
Primus Onja on test:
When I think of stoves I automatically think of Primus. I was brought up with the name as a symbol of quality and reliability, their three legged petrol stove an object of ambition alongside a Mountain Equipment Sleeping Bag and a Force 10 tent. While the three legged petrol stove has long since passed into the memory banks I've always had a soft spot for the brand. Soft spot aside, though, when I first saw the Onja double-burner I had that "object of desire" feeling again instantly.
In the picture above you'd be excused for asking "what about the gas bottle?", but therein lies the beauty of the Onja. In the picture the gas is already connected; it's already inside the Onja's casing.
For carrying the sides of the Onja push inwards from the base to form a rectangular box with a quick release strap running transversely to hold the sides together and a shoulder strap running from end to end. A solid wooden chopping board covers the burners in transit and provides attachment points for the shoulder strap. The result is an easy to carry, fully contained, package that you can sling over a shoulder.
To use the stove simply unclip the shoulder strap, remove the wooden chopping board and pull the sides apart. On opening the sides the centre drops down to leave the burners just below rim height, giving very good wind protection, and the spread sides provide a very stable base.
With each burner eating through up to 200g per hour there's no shortage of power at your disposal but it's also extremely adjustable with the two burners having independent wire adjusters on the front side. In practise a pair of 450gm canisters is going to last; the majority of use will be short bursts of full power for boiling water and a lot of simmering at a fraction of full power.
The combination of a solid base and well spaced, wide, burners means the Onja is superbly suited for large pans and group cooking nut at 3kg (excluding gas) it's light enough to carry a while for the single camper looking for that bit of luxury. If you're camp site based there's simply no reason not to take an Onja rather than a traditional single burner gas stove.
There's no piezo ignition but with wide and easily accessible burners that's no big problem and, to be honest, it's one less thing to go wrong. Of course should something go wrong with one of the burners, not that it's even looked remotely likely, you still have a second burner thanks to them being independent of each other.
The design has been carefully thought through to make the Onja portable, from the fabric sidesto reduce weight through to the width of the unit when closed being just enough to take the large 450gm gas canisters, and it's built with that same quality that I remember from growing up. The strap fittings are solid brass and the chopping board lid's solid oak so despite its light weight it has that solid feeling of something that's going to last. Compared to a traditional double burner with a hose, regulator and seperate gas bottle it's a no-brainer; the Onja's lighter, easier to carry, more stable and uses the same canisters you use for other camping stoves but it still offers the same wide burners needed for big pans and minute flame adjustement to allow simmering.
Impressed? Let's just say I don't mind the rest of our review team seeing it on a meet but it's going nowhere without me. With a £115 price tag (street price from £100) it's real value for money and if they want one thay can get their own!