John Grundy Limited was a company of heating engineeers and ironfounders that was started in Tyldesley, Lancashire in 1857. In the 1880s its headquarters moved to London but its works remained in Tyldesley.
John Grundy (1807–1893) was a grocer with a shop in Elliott Street, Tyldesley, near Manchester. At Tyldesley Top Chapel where he was a churchwarden, Grundy experimented heating it using a stove, flues, chimney and ventilators and succeeded in warming it. He decided to manufacture heating apparatus and set up John Grundy Ltd in Lower Elliott Street in 1857. He was granted patent BP 2949 for the apparatus in 1864 and other patents were granted for improvements made subsequent years. A monument dedicated to him is sited near the gates of Top Chapel.
His son, John Grundy (1844 – 1913) was working in the family shop in 1861. After Grundy senior founded the heating company, father and son continued working in the shop and the census of 1871 lists them as flour dealers. By this time the company was successful and changing the family fortunes.
Grundy junior was living in Hackney, London by 1881 and later in the 1880’s moved to a more fashionable area in City Road, Islington which became the company’s head office. Now heating and ventilating engineers, the company opened show rooms and work premises in Torrens Street Islington, at 393a City Road, and at 57 Wigmore Street Cavendish Square in London’s West End. In 1897 the Institution of Heating and Ventilating Engineers was incorporated in 1897 with John Grundy Jr its first president. The company produced iron castings for a wide range of purposes, including, for example, machine tool beds for Churchill Machine Tool Co. 
In 1913 Herbert Grundy became managing director after his father’s death and when the Great War started, the company was placed under Government control and its production concentrated munitions for the war effort.
Grundy’s warm air stove heating apparatus was installed in several cathedrals, and numerous churches and chapels throughout the country. The heating apparatus was produced at the iron foundry and works in Parr Street Tyldesley in 1886 Grundy’s products included the Helios and Sirius smoke-consuming grates and the Hestia warming and ventilating stove. The foundry also produced stoves, ranges, fire-grates, cast-iron pipes, fittings, radiators and ventilators.