[citation needed] Shacklock was born in Kirkby-in-Ashfield, Nottinghamshire, England, and served his apprenticeship in several foundries in Nottingham and Derby.
Shacklock first gained a job cutting scrub on the Otago Peninsula before his fiancée, Elizabeth Bradley, came to join him in New Zealand.
He lived in Oamaru for a time, before returning to Dunedin and settling on an adjoining section on Grosvenor Street and Park Terrace.
That design was continually improved and modified, becoming an appliance that warmed kitchens, heated water, baked scones and cooked porridge throughout thousands of New Zealand homes.
Those included double ovens, and ones featuring a "destructor" firebox that was advertised as a safe and hygienic way of disposing of kitchen waste.
In 1955, Auckland company Fisher and Paykel Ltd acquired H. E. Shacklock Ltd., but the brand continued to dominate the New Zealand domestic appliance market through the era of government protectionism.
The original H. E. Shacklock Ltd. buildings in Princes Street, Dunedin, are listed as a Category II historic place by Heritage New Zealand.