Les: I'm interested in your idea for a small ( Asian?) butane stove & extra cartridges. We live in an all electric high-rise, without an open terrace. Our present back-up stove is an old two burner Coleman Fuel / unleaded gas, hand pump camping stove. The CO danger, even near an open window, has always concerned me. Butane is, in my understanding, cleaner burning than liquid fuel. So which model do you recommend? What kind of burn time does S cartridge give you? Add all the usual questions?