the Lennox 17H61 is rated for standard residential and commercial voltages

ensuring continuous cooling water regulation

including specific packaged rooftop air conditioners and split system air handlers

it manages the oil burner startup cycle

Optimized for natural gas and propane boilers

Tekmar Controls 261 Control 320788-703 the Lennox 17H61 is ratedThe Tekmar Controls 261 Control is a reliable, microprocessor based 120Vac two stage boiler control designed for precise outdoor reset or setpoint operation. High performance hydronic systems rely on the 261 to manage boiler staging and equal run time rotation, ensuring balanced wear across multiple heat sources. By utilizing a characterized heating curve, this controller maintains a tight boiler target temperature based on real time ambient