The Coleman F1 is the little brother of the Coleman F1 Power

The Coleman F1 Power has a BTU of around 23,800 BTU or 7kW, as you can imagine this stove just eats fuel, but when used with an Etapower pot will boil a litre of water in around 1 min 45 seconds.

The downside is the efficiency, which from experience would be somewhat approaching a conventional stove such as the Snowpeak with a conventional pot in terms of litres boiled per cartridge, but this can be mitigated somewhat by turning down the output.

They actually are quite reasonably lightweight and very cost effective stoves, with the Coleman F1 currently being around 1/5 the purchase cost of the Soto in the UK.