Mike while waiting for boiler material to arrive i thought i would try some sums i have a small meths burner which so happens to be 1"dia x 1 1/8" full it takes 12ml of water which means 1/8 = 1.3ml. boiler i was going to make was 1" x 1 3/4"=14.6ml if i make a boiler 1" x 2"=21.3ml and leave out the air space i`m back down to 15ml approx which i think is roughly 1/2 a US fl oz which means i might only get a run of 8mins but i really would like the tank to be 1" x 1 3/4" so i might be struggling to get 5mins?
1UK fl oz = 28.41ml
1US fl oz = 29.57ml
No doubt there will be people out there who will know
Was brought up in the era of inches and miles but nowadays everything is metric