Thanks for the reply. I have the model boat (Sealight 1:24) but took out the engine plant to refurbish and clean the model. The burner was with the model, but is pressurized petrol so I will change to gas. The large tank is a condenser (water cooled off belted PTO pump), clean steam exiting middle of end and oil from bottom to a smaller tank (waste oil?). I do not understand how the smaller tank works. As you can see from photo, there is manual boiler feed and one driven off the gearbox. Since there is only 1 pipe to boiler, I presume the others in combination, are a system to manually fill then top-off mechanically when the engine is engine running. There is one pipe that crosses the compartment, through a globe valve, to a “T” junction; one pipe entering the top of the small oil waste tank , the other exiting the hull. I presume that this is a bypass to filling the boiler, but I do not understand why water would be pumped into the oil waste, or would the steam pressure be enough to pump the oil the other way into the exiting water stream (and onto the pond surface) ? One other question, the return steamline to the smokestack is lagged from the condenser, but the engine steam inlet pipe from the boiler is not. I would have thought that the inlet steam line would be lagged to keep steam from condensing before the engine? Any help or advice would be welcome – thanks