3/4" Threaded 5101 Geothermal Valve


Brand: Taco

Mfr Part#: 5101-G3

UPC#: 687752023862

Availability: In Stock
Usually ships: within 1 business day
Qty Price
$172.95 / each & Free Shipping
x2 $333.90 & Free Shipping
(2 x $166.95 / each)
  • Description
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  • Reviews (4)
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Taco 5101-G3 geothermal valve replaces 5101-G2.


Taco 5101-G3 geothermal valve (3/4" threaded) is designed to control open type geothermal systems with high head. The unique end switch design of Taco geothermal valves allows to control of the heat pump from the valve. This allows movement of cold water into the coil before the heat pump actually starts.


Technical Specifications:

Connections: 3/4" threaded

Max pressure: 125 psi

Max operating temp: 240F

Min operating temp: 40F

Voltage: 24V

Cv: 6.1

Body material: Bronze

3/4" Threaded 5101 Geothermal Valve has an average 3.3 out of 5 rating based on 4 user reviews.
Two failures in 8 years
By Verified Buyer on 2/23/2016
Hopefully the G3 version lasts longer than the G2 version. I am on my 3rd replacement. Why can't they just sell the valve without the electric valve control? Would be less expensive. I now have two good (spare) controls and no good valves.
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Great Price [...]
By Zofoman (from Flatlands of Nebraska) on 8/13/2011
After much searching for the part I needed (Taco valve 5101-G2), found the best price here at PexUniverse. [...] Part is the exact replacement needed for our geothermal heat pump.
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Just what I ordered.
By JET (from Oxford, New Jersey) on 6/23/2011
The valve is the exact item that I expected, [...]
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0 of 1 people found this review helpful.
By Hurley G. (from Franklinton, LA) on 4/29/2013
I have two geothermal units in my home that are about five years old and I have had to replace both valves twice and am looking at replacing the valve on one of the units for a third time. I have a serviceman coming tomorrow. They keep replacing the whole unit. Why can't they just replace the "power head" for less than half the price?
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