My geothermal installer used Taco slow close values with my WaterFurnace system. The problem I have is that these valves last only 1 to 1 1/2 years and then I have to buy new power heads. At $76.95 (+S&H), if I need to replace both, that's over $153 each year. Is it possible to replace these slow close valves with regular valves (that would hopefully last years) and just add a water hammer arrestor? I just tired of shelling out so much money every year. When a valve goes bad, it stays open and then my electric bill climbs until the valve is replaced.

I have an open loop system drawing water from a very deep well and a WaterFurnace Premier 2 which was installed during construction 12 years ago.

Thanks in advance for your response.

Rob

Given the age of the system, I presume the Taco slow close valves you have are the heat motor zone valve type, which take up to 90 seconds to open from a cold start. Given that, you might consider replacing them with Taco's newer Zone Sentry valves. These open in 5-6 seconds, using power from a capacitor to run a small motor. Power draw is a lot lower, too. Taco has a special version of that valve for use with well water in geo applications. Ask Taco for the part number. This valve was mentioned in an earlier thread:

http://www.greenbuildingtalk.com/Forums/tabid/53/aff/13/aft/80653/afv/topic/Default.aspx

From that thread, I posted this:"Per Taco, they have a version for an open loop system (ground water), their part number V075T2B1ZA024Q4A1." That number came from a discussion of this with Taco. I first got information from their website for a Zone Sentry valve of the right capacity, but later Taco advised me of the slightly different version, for use with well water in open loop.

The right part number for you may be slightly different, depending on capacity of the valve, and whether the connections are threaded or sweat.

I've seen some of the Geo HVAC guys in my area switch over to inexpensive irrigation valves instead of the expensive brass Taco valves.

Danfoss has a nice new zone valve which is full port. Neither Erie or Taco can match the Cv

Thanks all for your responses.