Conbraco Industries has developed a series of energy-saving hot water mixing valves designed specifically for radiant heating applications. The Apollo 34H Series radiant mixing valves, in 1/2", 3/4" and 1" models, features a high-copper-content, all-bronze body; heavy duty stainless steel springs; brass stem and retainer, plus a special high temperature thermostat. Temperature-activated 34H Series valves adjust water temperatures between 120 degrees F and 180 degrees F. They offer a water inlet range from 140 degrees to 212 degrees F and operate with a rated maximum working pressure of 125 psig. Conbraco Industries.