hain mill, also known as wernersville mill, is a historic grist mill complex located in lower heidelberg township, berks county, pennsylvania. the merchant mill complex includes the 2 1/2-story stone mill building (1798); stone farmhouse / miller's house (1782); two-story, stone and frame barn; frame toolshed; frame woodshed; and frame outhouse. the mill ceased operation prior to 1961.