Building off of the previous stove testing I did ([effect of fuel canister...
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The original was posted on /r/Ultralight by /u/Wandering_Hick on 2024-11-07 22:53:35+00:00.

Building off of the previous stove testing I did (effect of fuel canister level), I have completed additional tests to assess the effect on boil time and fuel consumption of pot diameter and whether a pot has a lid or no lid. I used a BRS3000 stove and Soto Windmaster for the testing. Based on the results from the fuel canister testing, I switched to using 450g fuel canisters that had some fuel burned off and MSR LowDown remote adapter to manage fuel flow. Fuel flow was limited to one 360 degree rotation of the LowDown valve (720 degrees fully opens the valve). The pots used were a Toaks 750mL (95mm), Toaks 700mL (115mm), and Toaks 1650mL (145mm).

Here are some charts with the results of the testing. And some takeaways:

  1. Pot diameter affects boil times and fuel consumption for both the BRS and Windmaster.
  2. The difference between the shortest BRS boil time and longest was 36%. The difference in BRS fuel consumption was 28%. The difference between the shortest Windmaster boil time and longest was 29%. The difference in Windmaster fuel consumption was 25%.
    • Fuel consumption and boil time are reduced more for the BRS than the Windmaster as pot size increases.
  3. Over the course of 110g fuel canister, you’d get 6 days of use instead of 5 days if you used the 115mm diameter pot instead of the 95mm diameter pot (with a BRS stove, no lid, and the exact same conditions this testing was done).
  4. Whether a lid is on a pot or not didn’t really affect fuel consumption or boil time. It may become more of a factor for longer boils (e.g., colder conditions, low fuel, alcohol stove, or large amounts of water).
  5. Lid on vs lid off results seems to line up with GearSkeptic’s results.

I also did some fuel flow tests with the MSR LowDown adapter (charts at link above) and found similar results to when fuel flow was changed due to fuel canister levels. The regulated Windmaster is pretty steady for boil time and fuel consumption until fuel flow is reduced quite a bit. The BRS sees boil time increase and fuel consumption decrease pretty linearly as fuel flow is reduced.