The bigger Luna Valley boiler:

Two drum water pipe boiler, content 19.7 ltr, working pressure 10 bar, about 150 pounds per square inch.

Inside the new, bigger Luna Valley boiler from Glyn Lancaster Jones

 Pressure Vessel, NO WELDING!

After I took her home, july 2003:

Below: an original Luna valley boiler:

This one is on SL Oxbird from Eric Saubesty in France (member SBA). After I saw his boiler I decided to order a similar one (just bigger) from Glyn.

An original Luna valley boiler, fired by oil, powering a ST6A

The oil burner