This is an interesting looking engine, with it's pyramidical shape. It is electrically heated with a 110V element, originally with a 2 core cable but now replaced with a 3 core.
There is also a Sterno heated version (here).
The boiler is vertical but not strictly cylindrical. It occupies 2 tiers of the pyramid shape. It's total height is 117mm and is 78mm diameter for the lower 42mm and 65mm diam for the upper 75mm. It has fairly standard whistle and safety valve on the top, either side of the (purely cosmetic) chimney.
The Engine bracket is mounted directly on the side of the boiler with 2 steam feed pipes only a few mm long, one for each end of the double acting cylinder. The crankshaft penetrates the boiler half way up (through a pipe) and has a 68mm diameter flywheel on the other end.
When I acquired the engine, it was in pretty poor condition. The mains cable was in poor condition and was unearthed. I have replaced it with a 3 core cable. The big end of the piston rod was broken off. Because the cylinder looks as if it was not designed to be opened up, I soldered a brass end onto the existing rod. The boiler is, unfortunately, made of steel and is suffering from surface rust around the top fittings. Because the original paint finish would be difficult to reproduce, I've treated the rust with the traditional "oily rag" treatment and left the paint as is. It's something that will have to be kept under close watch when the engine is run.
Overall, a charming little engine. It runs smoothly, although it won't win any speed contests.