SolarHot SolVelox pump station for closed loop solar DHW systems that do not have a tank with an internal heat exchanger. Complete packaged pump station with Stainless Steel plate type heat exchanger, Grundfos UPS15-88FRC glycol pump, 15-10B5 brass domestic water loop pump, fill & purge valves, Steca 301 control with 3 sensors, pressure gauge, relief valve, & air purger. Expansion tank not included.