you stole my answer!

Someone will point out though that it is a water heater

Wayne


"Erik" wrote in message
...
In article ,
"John Grabowski" wrote:

You can try replacing your pressure reducer. A defective one is a common
cause of banging pipes in condos. If you don't know what it is you
should
call a plumber.

Another thing to try... turn off the water at the street (turn your hot
water heater to pilot while your doing this to be safe). Go around and
open all your water valves, and flush all the toilets... turn the
washing machine on to warm 'fill' for a few seconds too. If you have any
outside hose valves, open them as well. Go back and close all the
valves, turn on the water (and hot water heater). There will be a few
minutes of air hissing and spitting when you start using water again...

Many plumbing systems have air chambers to absorb water hammer shock,
and sometimes they become water logged. Your goal in this procedure is
to temporarily drain as much water as possible out of your system,
allowing these chambers to refill... really just some short vertical
sections of capped pipe with air trapped within. (crude but effective
hydraulic accumulators...)

I need to do mine every 2 or 3 years...

Good Luck!

Erik