GEA Flat Plate's FP series of Heat Exchangers 3" x 8" models are designed for hydronic heating, snowmelt (glycol), potable hot water, various industrial processes and other uses where an efficient, reliable and compact fluid-fluid heat exchanger is required. These heat exchangers are 100% factory tested, are made of stainless steel, and have heavy duty male pipe thread connections, and mounting studs come standard. The heat exchangers are UL and CRN listed.