The West side boilers do not seem to have played a major role during the life of the colliery.  Neither  they or the west chimney are shown on the 1875  1 : 2540 scale map.  They are shown on the 1899 map with 4 on either side of the chimney.  By 1916 only the  4 to the SW of the chimney remain and by 1938 these have gone as well.

When the South engine-house was enlarged in 1922, the 4 SW boilers and their rear flue were removed, but it is just possible that traces of the NW boiler flue-way may still be present under the debris alongside the North engine-house wall.

The engine-house wall at the rear of the SW boiler-house.

The engine-house wall at the rear of the NW boiler-house.   There are a number of corbel stones projecting from the wall at about boiler top level but it’s not known what they supported