I read and contributed to the "heat exchanger shootout". Roger's remarks have to be taken in the context he was talking about at the time. Take Roger's results and change the context and interesting things happen. Dont read and shut your mind. To save you looking I have copied the last post in the heat exchanger shoot out discussion. This is Me quoting myself, but shoot me down if you wish.
"I can see I might be jumping the gun before part 4 of this interesting series but I want to reanalyze Rogers results for the windpro, the best non heat exchanger and the packlite, the best heat exchanger stove, for use in winter and melting snow.
Roger has the bottom line that you need 34 litres of water boiled before the packlite starts to beat the windpro. People will look at this and even for 2 people they will say that is 10 days or so, the contest is over, use the windpro.
As Roger tested them the weight difference is 132 grams but the packlite has a 90 gram windshield but could have been tested with the 71 gram windshield the windpro was tested with, that is 19 gram difference. The packlite has an igniter, to be fair head to head this should be removed I guess 15 grams. The windpro was tested with a 1.5 litre pot that comes with a pot lifter weight 29 grams, but it was not included. The packlite has an integral handle. Head to head the handle should be removed or the pot lifter included. 29 grams difference. make these amendments and the weight difference is down to 69 grams.
I use similar amounts of water to Roger. In winter we use 3 litres per camp maybe more but he has tested with an 80 degree C rise. In winter 100 degree would be closer. so I will multiply the fuel cost per litre by 25% to allow for the colder water. The sum is therefore how many litres does it take to use up the 69 grams of packlite extra weight. Each litre of water takes 3.85 (Roger's figure) x 1.25= 4.81 grams of extra fuel with the windpro so 69 /4.81 = 14 litres. By this time the windpro will have used more than one canister, 220 grams of gas. For us I see the break point as 4+ days. that is still a long time.
I do not own a packlite but it looks as if the base plate could be lightened. Also if you decided not to carry the packlite windshield and use a lighter one you could cut the windshield supports off the packlite feet. The only way to find those savings would be to do it.
If you must melt snow and boil, at camp only, you must almost double the gas used. If you must melt snow for the next day too you could triple the gas usage. In this final scenario anything more than one camp and the packlite would be lighter.
Most of the difference in weight is now the weight of the heat exchanger pot. The lightest winter stove is probably a primus eta packlite with an ordinary pot for short trips that dont melt snow, and take the heat exchanger pot for snow melting and longer trips"
I have now made these weight savings. I have also been on several trips extreme enough to see the savings. Camping high on long frozen ridge walks, melting snow for tomorrow,as well as camp and 2 people to a stove, a few extra hot drinks for comfort, a hot water bottle. You can get to the break point in one night if you want, how far from "infinitesimal" is that!
edit to add the weight difference between my heat exchanger pot and my Ti 1.2 litre alternative is about one empty 100gram canister so as soon as you need to carry more than one canister of any size it might be worth using a heat exchanger pot ( given my context)