The tekmarNet 2 House Control 406 operates up to two stages of air-to-water or water-to-water heat pump, in either heating or cooling mode in a single storage tank, two-pipe system. Multi-zone integration, using communicating thermostats, reduces cycling, boosts COP, and provides automatic heat-cool switchover with interlocks. It also includes several back-up heat source options.

Tekmar Control Systems | www.tekmarcontrols/406.html