The Mixi-Mizer radiant floor heating pump improves control in the increasingly common primary/secondary piping configurations, says the company. The injection pump proportions and injects water from the primary loop to the secondary loop. The unit is said to simplify installation and wiring, and allows users to directly control critical water temperatures below 140Â°F for long system life, the company says. The standard spring check valve built into the pump casing reduces energy costs by eliminating uncontrolled “ghost flows,” says the manufacturer. Grundfos Pumps Corp., 3131 N. Business Park Ave., Fresno, CA 93727; 559-292-8000; 559-291-1357 (fax); www.us.grundfos.com (website).