The Express Spider folded up, courtesy Primus.
First we had the Primus Eta Power stove, reviewed in our Stove Shootout series. A fine stove, but a heavy combination. One might suggest that the overall concept came from a traditional heavyweight backpacker. Then we got the Primus Eta Packlite stove: a reduced-weight version of the Eta Power, but the result was still a bit heavy for the fanatics, even though both of these stoves had good performance and low CO emission.
Now, what happens when you take the core of one of these stoves and strip away all the fancy frills? In short, you are left with the burner and a pot stand. In other words, the Primus Express Spider.
The burner is the same one used in the two parent stoves, and the CO emissions were very similar - around 10 ppm once the stove has passed through the normal warm-up spike in CO. This figure is gratifyingly low. This stove could well be used in the vestibule of a tent in mid-winter.
The efficiency of the stove is quite reasonable too, requiring between 11.7 (at low power) and 12.7 (at high power) grams of fuel to raise one litre of water through 80 C (our standard test conditions). The stove takes between 5.8 (high power) and 12+ (low power) minutes to heat that litre of water through 80 C. Of course, if you are melting snow you will need more fuel and more time than this.
Starting and running canister positions.
The stove does need to be started on gas rather than liquid if you can manage it, and converted after maybe 15 seconds to a liquid feed as shown in the two photos here. If you have to start it with a liquid feed, warm the preheat tube up in your hand for a moment first, and then start with a very low flame. Once the flame is bathing the preheat tube, you can start increasing the power.
Express Spider in the field.
Being a rather low stove means that you only need a low windshield for it, as shown here. It also means it is quite stable in the field. This is convenient, but given its fairly high power, you would definitely be well-advised to use a moderately wide pot to get the best efficiency from it. Me, I pack the stove inside the pot for protection - no kinks in the hose please!
With a weight of roughly 200 grams and the good all-round performance outlined above, this stove would be excellent for two people in the winter and still very suitable for a solo walker (skier, snow-shoer, ...)
Specifications and Features
|Country of origin||unknown|
|Materials||Brass, stainless steel, plastic|
|Size||approx 120 x 85 x 55 mm (4.7 x 3.3 x 2.2 in)|
|Weight (claimed)||198 g (7 oz)|
|Weight (measured)||195 g (7 oz) (bag extra)|
|Boil time (claimed)||4.5 min|
|Power (claimed)||2.1 kW (7150 BTU/hr)|
- Robust and stable
- Fairly light for a remote canister stove
- Easy to use
- Refine design of brass air inlet region to titanium/aluminium
- Titanium legs?