UKC

/ Heat Exchanger Pots / Snow melting

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purplemonkeyelephant - on 11 Jan 2018

Currently I only have a 1L pot for my stove so am looking to get something around 2-3L for daily snow melting to minimise the amount of melts and boils needed each time. My current pot has a heat exchanger and I've read a lot about the pros and cons but to me it seems better to have one that not, even it's a bit heavier. The problem is that my stove is fairly small and so large pots with a HE won't sit on the HE but on the base of the stove. Does it matter whether the stove legs are on the heat exchanger or pot base? There isn't really any mention of it in the Primus manuals, just a symbol on my Eta pot showing not to do it. Using the flat base of the pot puts the burner closer to the contact surface, does that reduce efficiency? Should I get a flat based pot or is it still worth getting a HE even if it doesn't match my stove exactly? Wish Primus would actually return emails, phone calls etc!


matthew - on 11 Jan 2018
In reply to purplemonkeyelephant:

> Using the flat base of the pot puts the burner closer to the contact surface, does that reduce efficiency?

Having the flame too close to the pot does reduce efficiency. It seems that the pot cools the flame, resulting in incomplete combustion. As well as fuel consumption, carbon monoxide emissions are also increased and could be harmful in even a partially enclosed space. It is reportedly a design fault with many of the micro stoves on the market.

To work properly, a heat exchanger needs to be a reasonable match with the stove. There is something to be said for the smaller pot. Apart from being lighter, it is much easier to get hot and you can have a drink while you are waiting for the next one.

purplemonkeyelephant - on 12 Jan 2018
In reply to matthew:

Interesting, so would you say it's more efficient to do multiple boils in my small pot - or one big boil in a 2/3L pot? My little pot is super efficient, but I figured repeatedly emptying it into flasks would be a big waste of heat. 


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