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Taco Geothermal Valves are designed for high-head, open-system zone control. The unique end switch design permits control of the heat pump by the valve, allowing cold water into the coil before the heat pump starts.
(based on 14 reviews)
of respondents would recommend this to a friend.
Most Liked Positive Review
Silenced My Knocking Pipes
I used this Taco valve to replace a sprinkler-type valve that was controlling the water flow on my geothermal system. Before using this valve I tried several different knock arrestors to quiet down the...Read complete review
I used this Taco valve to replace a sprinkler-type valve that was controlling the water flow on my geothermal system. Before using this valve I tried several different knock arrestors to quiet down the noise caused when the valve kicked on and off. None of them worked completely, and frankly I was afraid the pipes in the basement were going to come loose from the ceiling, the knocking was so bad. After installing this Taco valve, all the knocking went away. When the geothermal system turns on or off there is absolutely no sound at all from the pipes. Now if I can only figure out how to silence the fan and compressor...
Most Liked Negative Review
Has to be replaced often. The valve seat/seal wear too quickly. Then the valve won't close all the way and the water continues to run.I'm changing mine once a year on average and...Read complete review
Has to be replaced often. The valve seat/seal wear too quickly. Then the valve won't close all the way and the water continues to run.I'm changing mine once a year on average and there goes some of the savings on having ground source. The control head has also failed on me twice. [...] You just as well by a whole new valve and head, which is what I have done.
Reviewed by 14 customers
Displaying reviews 1-10
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Cautionary advice for the 5101-G2 Valve
from Columbus, Ohio
Comments about 5101-G2 (3/4" Threaded) Geothermal Valve:
This "Thermal operator" valve has been a long term mainstay valve for geothermal applications where a slow opening and slow closing valve may be needed to prevent water hammer issues with the opening and closing of a geothermal water valve. The valve has a 0.9 amp opening current and may also carry the current needed for operation of a primary compressor contactor which in some instances will increase the current load on the thermostat heat and AC compressor ("Y" signal) to as much as 1.25 amps. This was no issue for older mercury or bi-metal type thermostats which were designed to accommodate this high switching current. However, many newer "electronic" and programmable thermostats have contact ratings limited to 0.5 amps. The higher amperage created by this valve can be a problem with thermostat reliability. Higher current loads on the newer electronic thermostats can and will cause stuck contacts (ie the heat or AC will not turn off the compressor after the room thermostat is satisfied and shuts the fan off) or (the thermostat simply fails / burns out due to the high sustained current load). Those using this valve should be aware of the amperage load imposed by this older design water valve and be certain that it can be managed by the thermostat and or controls within the geothermal system to which it is connected. As an alternate with a lesser current requirement I might suggest looking at a newer TACO geothermal valve V075T2G2ZA024Q4A1 or its 1" equivalent V100T2G1ZA024Q4A1. These valves draw only 0.48 amps when charging and 0.06 once they are open. There is a full pdf data sheet for them at the following link.http://s3.pexsupply.com/product_files/Taco%20-%20V100T2G1ZA024Q4A1%20-%20Product%20Overview.pdf
Bottom Line Yes, I would recommend this to a friend
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Should Last Longer
from Jacksonville, FL
We have two geothermal units and these are basically the only valves available. We've had to replace these valves 4 times in the last 5 years. When they work, they are great - quiet, no hammerlock - but for the price, they should last a lot longer. The valve is way too sensitive for well water which can be slightly on the hard side or contain infrequent fine sediment. I would recommend them since they are about the only semi-decent valve available.
(1 of 1 customers found this review helpful)
from Lewes, DE
I have five of these valves in my geothermal system. At least one per year fails. Either the head or the internal mechanism in the valve body. The head is about $50.00 to $100.00 to replace, the internal mechanism about $150.00 to replace. If you are handy, the replacement is easy. When the valves work, they work OK.TACO now sells a geothermal ball valve. I don't know anyone who has any experience with them. But if I ere putting in a new system, I'd go for the ball valve type. It would be a job to replace the current valves.
Bottom Line No, I would not recommend this to a friend
Rust and wear causes these to fail
By Jon who thinks geothermal is too $$
from ottawa, canada
For the price of this valve, I would expect something that would last for many many years. Instead, count on only getting a couple of years, at best. In a humid basement (even with dehumidifiers), the metal will rust quickly. Combine that with the wear from normal usage and the valve will begin to seize, requiring replacement. If you can do it yourself, no problem, replace the whole thing. Many contractors just replace the head and call it fully serviced (while charging full price). For the short lifespan, it should not cost more that $20 - $30... over $160 is outrageous. Definately needs major improvement.. I'd buy something else if there were something else to buy.
Works very good but I have slightly acidic water from my well and this valve will last only about 1 1/2 years(leaks thru)...can't find an alternate replacement yet...
This valve was to replace an identical one on the outlet side of my geothermal unit. The old valve (only in place about three years)failed to close completely letting water leak through continuously. I hope the new one lasts longer, but that seems to be the complaint with these valves - they don't last.
Worked great new but didn't last.
from Cody, Wyoming
I replaced my first 5101-G2 valve after only 2 years of use.I am using the 5101-G2 valve on a heat pump. The valve portion worked flawlessly but the end switch only worked properly very off and on. Installed a new valve and it's working fine so far.
Quiet operation on my geothermal HVAC.
from NE Alabama
I had a bad water hammer problem. I installed an Asco slow closing valve and still had the same problem. I added this Taco valve in parallel and now the problem is solved. My wife is happy...need I say more?
Top of the line
from Bronson Mi
Taco make some of the best products. I am very satisfied. I have one installed on my main Geo Thermal unit 1 year ago with zero problems and it works just how it is intended to work.
Fixed water hammer problem
Had a terrible water hammer when my water source heat pump would shut off. Installed this Taco geothermal valve and now it is absolutely silent!
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