Check out the hot water control options from Grainger, including indoor/outdoor and indoor strap-on models. Indoor/outdoor hot water controls adjust boiler water temperature according to the outdoor air temperature. Indoor strap-on boiler controls provide high-limit, low-limit and circulator control without tapping the boiler or draining the system. Mounting strap offers any position mounting without leveling on a 2- to 6"-dia. pipe. Shop Grainger today for a reliable hot water control unit.