His approach relied on technical precision in line engraving and stipple. Heath specialised in translating the large-scale compositions of painters like John Singleton Copley and Benjamin West into accessible monochrome formats. In works such as Death of Major Pierson and Death of Lord Nelson, he managed complex groups of figures without losing clarity. His Apotheosis of Händel demonstrates his skill in handling allegorical subjects, using varied line weights to suggest depth and texture.

Modern collectors value Heath for the historical record his prints provide. These works offer a window into the naval and military history of the Kingdom of Great Britain. The formal quality of his engravings suits traditional interiors, providing a sense of scale and narrative. His portraits, including that of the Marquis Wellesley, remain sought after for their anatomical accuracy and the dignified presentation of their subjects.