My answer was this ... a stove sized to work with your average 450ml mug. As you can see it's not very big at 30mm x 32mm and it weighs 8g. It'll boil 300ml in just under 5 minutes and use 10ml of fuel doing it (which is about the right amount of water in a 450ml mug for a good brew).
For comparison, a Whitebox 'Solo' weighs 30g and measures 40mm high x 60mm diameter. An Evernew Ti weighs 34g and measures 42mm high x 71.5mm diameter.
Expect a 'production' model for sale shortly

