Hi, Re William Henry Heath, he was born in Blyth Marsh in 1835, and as you said married Elizabeth Mollard in Redruth on 11/1/1858, his father is named as John Heath (deceased) and occupation was earthenware dealer.
William did set up a shop in Camborne sometime in the 1860s and they had 11 children.
William died in Camborne in 1912 and is buried in the Wesleyan cemetary there, Elizabeth died in 1916 and is buried with William.
Hope this information is of use to you.