Watts D3803995 81005361 Isotherm with Safety Aquastat and Circulator

The IsoTherm is a compact, efficient pre-piped and pre-wired pump and mixing valve control designed to connect to 1 inch Stainless Steel Manifolds. When combined with Watts’s electrothermal actuators and actuator valve controls (not included), a complete trouble-free system is created, serving from 1 to 12 zones and delivering up to 50,000 Btu/h (maximum of 68,000 Btu/h with a minimum boiler temperature of 160 F). The mixing valve has a standard temperature range of 113 to 140 F (45 to 60 C). The unit is factory set at 131 F (55 C). The valve is easily adjustable and locks in position with a click-stop device, preventing temperature drift. A three speed 1/25-HP pump comes pre-installed and pre-wired, taking the guesswork out of field installations. The Watts 1558 circulator will flow approximately 10 gpm at 10 ft. hd.