Watts Tekmar Switching Relay 306P

Switching Relay 306P

The Switching Relay 306P is a versatile solution designed to manage up to six thermostats, orchestrating circulators to deliver heating within a zoned hydronic heating system. Notably, Zone 1 can be prioritized over Zones 2 through 6 and is capable of supplying heat to an indirect domestic hot water tank. The 306P offers optional exercising to prevent circulator seizure during idle periods and can initiate a post-purge operation in the last operating zone to enhance energy efficiency.

Key Features:

  • Supports unlimited zone expansion and offers zone priority settings
  • Features priority override functionality and supports pump exercising
  • Provides a RoomResponse™ signal tailored for modulating-condensing boilers, optimizing comfort and boiler efficiency
  • Compatible with all low voltage thermostats
  • Equipped with LEDs indicating status for each zone, priority, end switch, and RoomResponse™
  • Shares an Away signal among tekmar thermostats and features four ground screws for easy installation
  • Offers top, bottom, and back conduit knockouts for flexible installation options
  • Incorporates fuses to safeguard transformers and pumps, with two spare fuses included for convenience
  • CSA approved for reliability and safety assurance


Agency Approvals CSA C US
Ambient Conditions Indoor use only, 32 to 122 degrees F (0 to 50 degrees C), RH less than or equal to 90 percent non-condensing
Control Load 7 VA at 24 V (ac)
Control Type Microprocessor control, this is not a safety (limit) control
Dimensions 8-3/16″ H x 10-11/16″ W x 2-3/8″ D (208 x 271 x 60 mm)
Enclosure Material Cover: ABS plastic, Base: galvanized steel
Enclosure NEMA Rating NEMA 1
Power Supply 115 V (ac) plus / minus 10 percent, 60 Hz, 20 A
Pump Relay 115 V (ac), 5 A, 1/3 hp, 17.3 A combined