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As drawn, at least as I interpret the drawing it won't.

Yes Jamie, I am talking about steam, not hot water! I am not interested in radiant heat, I need to put steam radiators in the greenhouse as well as the house and without steam traps if it's a one-pipe system.

Why do you need a pump if I want steam to build up in the buffer tank? That tank is my battery, thermal deep cycle battery so that the boiler doesn't have to run around the clock wearing itself out. The idea is to generate enough steam to sustain the system. Yes the big tank would also hold hot water, but that water would be the condensate that returns from the main, not from the boiler. What is the point of pumping hot water into buffer tank if I need it to flash into steam? I cannot have my main run directly from a boiler riser, these boilers aren't designed for that, these are hot water boilers for radiant heat, but I do need to generate steam, and I need your help make it happen guys.

ChrisJ, the fast traveling dry steam has enough space in a 2-3" diam pipe to whistle around and yes it travels at 60 miles an hour at 0 psi, the higher the pressure, the slower it goes and the condensate gravitates towards the tank so long as vents are present and no micro bubbles are impeding every turn of the steam seeking the lowest pressure point.

leonz, I am not interested in coal, this is a firewood thread, a steam heating problem in need of a solution. I either modify an existing wood-fired system to flash into steam or I fabricate an actual steam boiler from scratch and hope I don't cause an explosion later.

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I am going to save you some time and work if you have no real interest in a coal fired steam boiler that can do what you want with low pressure steam with little work.

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If you want a wood fired gasification steam boiler for a one pipe system you should look
at the Alternate heating systems E250 wood boiler.

The E250 is an induced draft boiler that can be used to make low pressure steam, it is not a flash steam boiler, it has been tested to 250,000 BTU per hour for low pressure steam making and can heat 9,000 square feet.

It has a 2 pass gas burning system with a refractory brick lined combustion chamber.

The firebox is 48 inches long so you could load it with pulp wood lengths of firewood.

www.alternateheatingsystems.com/product/commercial-wood-boilers/