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wazeaz 07-12-2008 03:17 PM

will a expansion tank help with water hammer
new house. I have a pressure reducing valve and the pressure is around 60psi. I've read that if you have a pressure reducing valve you should also have an expansion tank. I've watch the pressure go up to 80psi when the water heater is on.
I was wondering if the tank would help with the water hammer that I have.

Also, does it matter where the tank is installed? Does it have to be close to the water heater? I would think that anywhere would work.


Marlin 07-12-2008 03:54 PM

You defiantly need one if you have a PRV. It might help, or not having a tank might be one of a couple problems you have. I always put them right by the water heater and rarly see them elsewhere. Occasionally I see them by the main. I don't see why you couldn't put one anywhere if you really wanted too though.

BillyD 07-12-2008 06:35 PM

You can use a small (1.6 gal.approx.)tank made just for that purpose at HD or Lowes. Most people install them on the cold side of the water heater to keep the hot water away from the bladder.

mstplumber 07-12-2008 11:51 PM

An expansion tank may or may not help with a water hammer problem, but if you have a closed system you need some type of thermal expansion control. Since your house is new I'm surprised you don't already have either a tank or pressure relief valve. Since you would probably be able to see a tank, look for a small relief valve either teed off the cold water at the water heater of under one of the vanities or kitchen sink. It would have a line running to the outside of the house. Many plumbers use these instead of tanks because the new home market is so competitive and tanks cost more.

If you decide to install tank, the water heater is probably the easiest location. If possible, install the tank with the opening facing down to minimize sediment build up inside the tank. If you do have a pressure relief valve now and are installing a tank, this valve should be adjustable so you can just also just set it at about 125 psi and forget it.

If you install a tank and still have a problem with water hammer, Sioux Chief makes some mini hammer arrestors which connect to a standard fixture stop and are very easy to install.

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