Always verify secondary transformer or line voltage before installation

Expanded Outlet Design: A 2-inch expanded outlet reduces backpressure during discharge

Using a shorter or longer probe can result in inaccurate temperature readings and safety hazards

By replacing worn internal levers and pins

Using this motor on a 115V circuit will lead to insufficient torque and terminal failure

Tekmar Controls 257 Control 321894-709 Always verify secondary transformer orThe Tekmar Controls 257 Control is a purpose built 24Vac domestic hot water two stage boiler control designed for high demand applications such as hotels, laundromats, and multi family residential complexes. This sophisticated microprocessor control provides high accuracy domestic hot water temperature regulation by effectively staging up to two on off boilers or a single two stage boiler. Utilizing an NTC thermistor 10k ohm sensor, the 257 maintains