3/4" Sweat 556 Geothermal Valve


Brand: Taco

Mfr Part#: 556-G3

Availability: In Stock
Usually ships: within 1 business day
Qty Price
$181.95 / each & Free Shipping
  • Description
  • Literature
  • Reviews (1)
  • FAQs

Taco 556-G3 is a 2-way style Geothermal Zone Valve with 3/4" Sweat.

Taco 556-G3 is specially designed for high head, open system zone control. The unique end switch design permits control of the heat pump by the valve allowing movement of cold water into the coil before the heat pump starts. Reliable built-in Heat Motor, wax filled element and microprocessor-based actuator tab provide unmatched flow control and improve comfort and energy efficiency. Taco 556-G2 Geothermal Zone Valve provides quiet and dependable operation with consistent performance.


  • 3/4" Sweat Geothermal Zone Valve;
  • 2 Way-Style;
  • Silent Operation;
  • Twist Off Head;
  • Bellows or Globe Valve Construction Ensures Positive Shut-off and Leak Proof Operation;
  • Easy to Install;
  • 24 VAC Powered with Isolated End Switch;

Technical Specifications:

  • Connection: 3/4" Sweat;
  • Style: 2-Way Geothermal;
  • Max Pressure (PSI): 125;
  • Max Fluid Temp: 240F;
  • Min Fluid Temp: 40F;
  • Electrical: 24 Volts, 60 Hz, 0.9 Amps;


3 Year Head, 5 Year Body Warranty
3/4" Sweat 556 Geothermal Valve has an average 2.0 out of 5 rating based on 1 user review.
Frequent Failure
By Marion B. (from Marion, IN) on 2/19/2012
I have this on an open loop Water Furnace Envision Heat Pump. The system is a year an a half old and I am on my 3rd Actuator. For some reason this fails open and when you're on an open loop this is an expensive failure.
Was this review helpful?  Yes / No
Indicate an email address where you wish to receive the answer to your question.
Enter numbers shown above without spaces. This step helps us to prevent automatic submissions.
The following was added to your shopping cart: ×

Forgot Your Password?

Enter your e-mail address below.
You will receive an e-mail
with password reset instructions.


Estimate Delivery Date & Cost

Ship to Zip Code:
Qty (Optional):