I've had a Vital stove for a while (https://vitalgrill.com/outdoors/ ) and been very happy with it. It is, without doubt, the fiercest stove I own (a claimed 20,000BTUs) - nearly 6kw) and will boil water or melt snow significantly faster than any of my petrol or paraffin stoves. the heat can be controlled either by a battery powered fan (hi/lo/off) and/or with an air damper. Works with wood scraps, wood pellets etc, However, it's not cheap. Batteries (2xAA) work for around 40 hours at full chat, and I can validate that from experience.
I've just seen a chinese clone of this on ebay - http://www.ebay.co.uk/itm/311664019010?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT . Major differences seem to be the hinges on the clone, better battery/blower connection options and a plastic container. No idea if it works as well, but at around £25 including postage might be worth a look.
I've just seen a chinese clone of this on ebay - http://www.ebay.co.uk/itm/311664019010?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT . Major differences seem to be the hinges on the clone, better battery/blower connection options and a plastic container. No idea if it works as well, but at around £25 including postage might be worth a look.