Sold October 2024 Back to Archive

Stuart HB4 boiler & compound twin steam plant - stock code 12167

A large steam plant, comprising a gas-fired Stuart HB4 boiler with compound twin engine.

In size and proportion, the engine is similar to the Stuart offering, although with reverser detailing reminiscent of the John Bertinat designs; it's complete with displacement lubricator, drain cocks and a gear driven boiler feed pump. We like the valve chest pressure gauges - suspect from the diameter of pipework that they're ornamental rather than functional, but a nice detail.

The plant is mounted on a substantial polished wood and aluminium base plate. There's a water tank and hand pump with bypass valve to one side, with a gas tank and oil separator - the latter currently not piped up - on the other.

The boiler is missing the cover plate from the far end of the central flue - a simple part which could be replaced by a turned component.

Fitted with a simpling valve connecting HP to LP valve chests, the engine runs on air in one direction, reluctant the other way.

Complete with a propellor shaft and propellor, overall it makes for a handsome, impressive-sized model.

Free UK shipping included.

length/inches 26
width/inches 13
height/inches 11
weight/kg 14
wheel material cast iron
axlebox type split bronze
cylinder material cast iron
valve type slide
valve gear Stephensons
reverser type pole
boiler number 12167
boiler maker Stuart Models
CE mark n/a - < 2 litre capacity
working pressure/psi 60
boiler type Centre flue with water tubes
boiler material copper
boiler construction silver soldered
hydraulic test valid to 22-Jul-2026
safety valve(s) 1
safety valve type spring
mechanical pump 1
hand pump 1