1″ GURU PC® with Heater Assembly

Price: Contact us for purchase info: (877) 379-8258

SKU: GURU PC® Series 451 (1") Heater Series 455 (120VAC/74VDC) Heater Series 456 (230VAC)

Product Description

The GURU PC®  freeze protection valve protects a potable water tank on a passenger car from freezing when the car heat is turned off. Utilizing our thermostatic technology, this valve monitors ambient temperatures and will drain the system before freezing temperatures can cause burst pipes and tanks, resulting in expensive and lengthy repairs.


  • Eliminates costly freeze damage in a passenger car
  • High flow design for rapid draining
  • Easy installation
  • Minimal maintenance required
  • NSF 61/372 certified
  • Shock  & Vibration tested

Design Features

  • Self-operating thermostatic valve
  • No electrical or air connections required for valve operation
  • Low lead brass/bronze
  • Dual port seals
  • In-line serviceable

Optional Heater Assembly Features

  • 2 LED lights for easy visual check of power and heater
  • 1" GURU PC with Heater Assembly Freeze Protection Valve for a Potable Water TankSelf-limiting heater
  • No moving parts to wear
  • Minimal electrical noise
  • Easy installation/removal with one hand or glove
  • Heaters available: 120VAC/74VDC & 230 VAC


The 1″ thermostatic GURU PC® valve is installed at the lowest point within the potable water bearing system on a passenger car to prevent the water from freezing when the car heat is turned off for switching locomotives or even brief layovers.

This self-contained freeze protection valve monitors ambient temperatures and will automatically drain the potable water tank if the air temperature falls to the valve’s set-point, 35°F, preventing burst piping and thousands of dollars in damage. Once the car heat is restored, the valve will modulate closed, allowing for the tank to be refilled before returning to service. Since the valve is completely mechanical, no electrical or air connections are required.

To avoid a delay in refilling the water system and getting the car back into service after a valve activation we offer an electric heater assembly. The heater attaches to the thermal actuator on the valve and will warm it up quickly once power is restored to the car. This allows the valve to close and the system to be refilled as quickly as possible.

System Design Notes

Valves are typically installed inside equipment cabinets or between the inner and outer car body. If a valve is to be installed outside or underneath the car, provide proper protection (e.g. skid plate) to avoid damage from impacts of roadside debris.
All car designs should be properly validated and tested.

The heater assembly can be hard-wired into the car’s main power system, no other air connections are required.


1″ GURU PC® with Heater Assembly Product Sheet
1″ GURU PC® with Heater Assembly Installation and Maintenance Instructions