The building is more or less Jacobean in style with curving Dutch gables, and a tapering octagonal brick chimney.
The historian of British industrial architecture Hubert Pragnell calls it a "cathedral of pistons and brass set within a fine shell of Victorian brickwork with no expense spared".
Both engines can be seen fully operational and in steam on various weekends and bank holidays each year.
[3] The museum also contains three 1908 Lancashire boilers (two of which are still in regular service), a blacksmith's forge, a waterwheel, numerous steam engines and pumps, a replica plumber's shop, and many items associated with waterworks.
In addition, visitors arriving in the engine house are now able to see to the bottom of the 250-foot well shaft by means of a viewing panel inserted in the floor.