A new gas stove has been released from PRIMUS, which has a history of over 130 years in Scandinavian Sweden. The P-157 Integ Stove newly released by stove manufacturer PRIMUS, which I have been using for decades, is a single burner for mountains that can boil water at a speed that is not too different to a windless state even in a severe blast when standing.
Anyone who has tried to boil water in a snowy mountain has probably experienced that the heat power didn't increase at all and it took a lot of time to boil water. The stove used in harsh backcountry nature is particularly important for its strength against wind and cold. A stove that can be used without any problems in poor environments is essential.
A new high-spec model with excellent weather resistance is the Primus' P-157 Integ Stove .
This model seems to have specs comparable to the SOTO Windmaster, which has previously achieved top-class performance in comparison tests with Outdoor Gearzine, but what is the reality? I tried it out in the field right away.
table of contents
- PRIMUS P-157 Integ Stove Main Features
- Detailed review
- High heat power that allows you to boil water at an amazing speed
- High weather resistance that was able to be used without any problems even in blasts
- New valve that maintains stable heat even when used continuously
- In exchange for stable high heat, it is light and compact.
- While the size of the stove is high and stable, there are unexpected pitfalls.
- Summary: If you want to cover all seasons with just one stove, the Integrated Stove is the perfect solution!
PRIMUS P-157 Integ Stove Main Features
The P-157 Integrated Stove uses a newly designed valve equipped with a regulator mechanism, making it a high-performance single burner that provides stable, high performance and comfortable usability in any environment.
The newly designed valve equipped with a regulator mechanism provides stable gas supply even in warm environments and cold environments. The mortar-shaped burner head creates an inwardly tilted flame, and efficiently transmits the heat energy of the flame to the cooker, providing high wind resistance and stable combustion in any environment.
The four gutters are highly stable even when using large frying pans or cookers, and by setting the gutter surface at a higher position than conventional products, the design allows you to efficiently place the hottest part of the outer edge of the flame on the bottom of the pot.
It has high specs and is lightweight at 100g while ensuring high stability. It combines "practical" and "portability" at a high level.
Favorite points
- High heat power that allows you to boil water at an amazing speed
- High weather resistance that was able to be used without any problems even in blasts
- New valve that maintains stable heat even in continuous use and cold weather
Interesting points
- The weight and size are slightly larger when considering a single burner for solo use.
- Does it not work for small diameter cookers?
Main Specifications and ratings
| Item name | P-157 Integrated Stove |
|---|---|
| type | Direct connection type |
| Output (kcal/h) | 3.3kW / 2,840kcal/h (when using IP-250T) |
| Gas consumption (g/h)*1 | 220g/h (when using IP-250T) |
| Weight (g) | 100g |
| Gotoku size (Φ mm) | 148mm |
| Storage size | 7.3 x 10.1 x 4.7cm |
| Ignition device | can be |
| 300ml boiling thyme | 75 seconds |
| Outdoor Gearzine Review | |
| Burning power | ★★★★★ |
| Wind resistant | ★★★★★ |
| Combustion efficiency | ★★★★★ |
| Storageability | ★★★☆☆ |
| Easy to use | ★★★★☆ |
| Versatility | ★★★☆☆ |
| weight | ★★★☆☆ |
*1 Calculated from the spec table
Detailed review
We will tell you that we have tested several times in an environment with an altitude of 2,000m to 2,500m and a temperature of 0 to 5 degrees. It has been used even in strong winds when it is only a little standing, so I think it will convey a realistic feel to those who are planning to use it in harsh natural environments!
High heat power that allows you to boil water at an amazing speed
When I tried using an Integ Stove, the first thing that surprised me was the high heat power.
After a pre-combustion test in a windless state, it took 75 seconds (1 minute 15 seconds) for 300 ml of water to fully boil! I was able to boil water as soon as possible compared to the stove I had used up until now.
The output of the Integrated Stove is 2,840kcal/h. The Primus gas stove, Ultra Burner (P-153), also boasts an output of 3,600 kcal/h, which is higher than that of an Integrated Stove, but it takes 105 seconds for 300 ml of water to fully boil, and despite the lower output of the Integrated Stove, it boils completely 30 seconds faster.
The mortar-shaped burner head is designed to converge the flame, achieving high combustion efficiency.
This "mortar-shaped" burner head achieves this strength of firepower. The burner head is designed to converge inward, preventing the flame from escaping the outside when it hits the bottom of the pot, and by hitting the bottom of the cooker without waste, the flame's energy hits the bottom of the cooker, increasing the combustion efficiency to its maximum, resulting in astonishing firepower.
High weather resistance that was able to be used without any problems even in blasts
The effect of a mortar-shaped burner head is not just about the strength of the heat. Its high weather resistance (especially wind) also delivers amazing performance.
When I went to the field to perform a combustion test, the forecast showed that the wind speed was 10m, but in reality it was such a blast that it felt hard to stand up. I felt that it would be impossible to boil water in this weather, but when I tested it, I was able to completely boil 300ml of water in 85 seconds. The temperature was around 5°C, and even in the poor environment of a blast, the water boiled just 10 seconds longer than the preliminary test. Hats off to this one now.
I think this is because the burner head is designed to prevent direct air from hitting the combustion section.
According to the official website, the design of the stove position at a higher position than before would have allowed it to move away from the flame, which would reduce combustion efficiency in strong winds, but there was no problem at all.
Comparing thermal power and weather resistance with competing products
Comparison with rival SOTO Windmaster
We also conducted a comparison test with the SOTO windburner, which we have previously recommended for gas stoves in the all-round category at Outdoor Gearzine. *The following are the views based on Outdoor Gearzine's own test.
We measured and tested the time it took for 300ml of water to fully boil, and in the preliminary test the Integrated Stove was 75 seconds and the Windmaster was 81 seconds, and the difference was within the error range of 6 seconds, but in the outdoor test, there was a difference.
We tested the same way at a temperature of about 0°C, wind speed felt at 3-5m, and altitude of about 2500m, and found that the Integ Stove was 84 seconds and the Windmaster was 110 seconds. The Integ Stove was 26 seconds faster.
Just to be clear, Windmaster's "110 seconds" time is by no means late. It was frankly surprising that the Integ Stove would outperform that it was even more.
New valve that maintains stable heat even when used continuously
When using a gas burner, the "drop-down phenomenon" that reduces heat power due to continuous use.
I'm sure everyone has experienced this because, when gas stoves are used continuously, the gas cartridge itself gets cold due to air heating, making it difficult for the fuel inside the cartridge to vaporize, resulting in a decrease in heat.
For this reason, each manufacturer has a lineup of cartridges for "cold region specifications", but unfortunately, even cartridges for cold region specifications suffer from continuous use, there is a considerable decrease in heat power.
The decrease in heat power is more likely to be affected in low temperature environments, and the decrease in heat power is particularly noticeable when continuously used in environments such as in snowy seasons in harsh winters.
So what about the Integrated Stove?
I used it continuously in an environment with an altitude of 2,500m, a temperature of 0°C, and the wind was felt by about 3 to 5m, and when I tested how the time I boiled 300ml of water three times in a row, I found that it was 84 seconds for the first time, 85 seconds for the second time, and 90 seconds for the third time.
The time it takes for the boil to increase with each increase, but the difference between the first and third sessions is within the error range of 6 seconds. I was able to experience that the Integrated Stove is a stove that can be burned without reducing efficiency even when using continuously.
Thanks to the newly designed valve with a regulator mechanism installed that allows for stable gas supply. This crystallization combines PRIMUS, a leading brand in Sweden in Scandinavia for over 130 years, with regulator technology cultivated by Japanese partner Iwatani.
In a warm environment, gas inflow is suppressed when the internal pressure of gas is high, and when the internal pressure of gas decreases, such as when the internal pressure of gas is lowered, it is possible to ensure sufficient gas flow paths, which prevents the output from dropping.
In exchange for stable high heat, it is light and compact.
If you are planning to use it all year round in mountainous areas where there is a harsh natural environment, we can confidently recommend the Integrated Stove as a highly secure gas stove in terms of heat power and weather resistance.
However, when you look at it side by side with other gas stoves, the things that stand out are the size and weight.
Designed for combustion efficiency and weather resistance, the mortar-shaped burner head is larger than the burner heads of other stoves and also has a larger storage size.
Comparison of the size of Primus gas stoves
In fact, the small cooker I use everyday can be stored with the femto stove in conjunction with the cartridge, but the integral stove cannot be stored in the perfect fit.
The weight of the Integrated Stove is 100g (actually measured value is 100.2g), which is not lightweight compared to other gas stoves.
If weight is prioritized, the SOTO Windmaster weighs 67g (burner + 3 sticks), and the Integ Stove is superior in combustion efficiency, but if you compare weight, Windmaster is the best.
Furthermore, since you can choose from a lightweight three-piece type and a stable four-piece type, it can be said to be highly versatile as an option.
Storage size and weight are trade-offs for performance, so the best stove will vary depending on what the user prioritizes and what environment they use.
While the size of the stove is high and stable, there are unexpected pitfalls.
When the integral stove is unfolded, it reaches 14.8cm. It already has four bars, making it highly stable, but it is large enough to fit large cookers and frying pans.
It is designed to be stable not only with solo cookers, but also with large two-person cookers.
When spread out, it becomes larger, but what caught my eye is that when the stove is spread out, it cannot accommodate smaller cookers.
When the stove is widened, there is a space of about 9cm apart, so I could use it without worrying about a cooker with a 12cm diameter, but with a cooker with a diameter of about 10cm, I couldn't put it on until I checked the center directly above (it is difficult to use in the field).
It is difficult to place the cup with a 10cm wide open
If the stove is folded, it can be used with small diameter cookers, but other Primus stoves and femto stoves have slits (slits) on the stove so that they can be used even when folded, but the stove does not have slits.
The left is a femto stove and has a slit even when folded, making the cooker less slippery. On the other hand, the right side is an integral stove and can be used in a foldable state, but there are no slits.
Perhaps it is not intended to be used with a smaller cooker, and although it is not possible to use it when folded, I was concerned that there are no slits. If you use a small cooker solo, make sure you make sure it is flat before using it.
Summary: If you want to cover all seasons with just one stove, the Integrated Stove is the perfect solution!
We introduced the Plymus P-157 Integ Stove.
The Integ stove, which was able to boil water without any problems even in blasts and had no change in combustion efficiency even when used continuously, was the flagship model created by PRIMUS, which has a history of over 130 years, and Iwatani!
Absolute security is truly a guardian. Let's go on an adventure into the mountains with a pocket-sized guardian as our partner!
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Yosuke
People who act with just one backpack with the motto of "as light as possible" so that they don't get inconvenient.
From spring to autumn, I chase after char deep in the mountains and go fishing in the mountain stream. We walked the mountains in search of spectacular views that cannot be seen from the ground. Camping to be healed by the bonfire. Snowboarding is a floating mountain with a mountain of silver.
A freelance writer who has been enjoying the outdoors for over 20 years and enjoying the outdoors in his own way all year round. Based on my experience writing articles for more than dozens of outdoor web media, I will be sharing my own experiences and tools that I have been using.