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  • boiler pressure

    Hi, what is the relationship between the boiler pressure and system performance, is a higher pressure better as long as it dose not exceed the relief valve setting?

    Thanks

  • #2
    Re: boiler pressure

    No.
    sigpic

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    • #3
      Re: boiler pressure

      boilers are not to be trifled with. they have devastating results if you don't know what you are doing. call a boiler company. play with the thermostat not boiler. breid..............

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      • #4
        Re: boiler pressure

        dont go over 15#
        Last edited by plumbworker; 08-28-2009, 06:50 PM.

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        • #5
          Re: boiler pressure

          Originally posted by churchi View Post
          Hi, what is the relationship between the boiler pressure and system performance, is a higher pressure better as long as it dose not exceed the relief valve setting?
          Originally posted by churchi View Post

          Thanks
          What do you mean by system performance? Are you using the boiler to heat your home? Whether or not a higher pressure in the boiler would increase system performance completely depends on what the boiler's intended purpose is.

          Pressure and temperature are directly related. As temperature increases so does pressure. This is do to the water expanding as it heats up, liquid vapor pressure etc etc etc. You need to be very careful when playing with a boiler. In order to operate a boiler over 14.7 PSI in Canada you must hold a minimum provincial fourth class power engineering certification. This is because of how dangerous boilers can be. When high pressure/high temperature water escapes from a boiler (like what would happen if your pressure safety valve failed and your boiler exploded) the water expands in the form of steam 1700 times its size as water. So take a penny, next to it stack up 1700 pennies..... And the expansion I mentioned happens faster then you can say oh Sh**!!! If the heat/scalding hot water doesn't kill you the lack of oxygen will.

          All that being said, what is the idea behind increasing your boiler's pressure? If it aint broke, don't fix it.

          Best,
          Joe

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          • #6
            Re: boiler pressure

            My hot water boiler runs at about 12 pounds, it's been set at that since 1965, and has not ever been messed with that I can remember. Had a newer installed in 04, and it runs at about the same pressure.

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            • #7
              Re: boiler pressure

              Originally posted by churchi View Post
              Hi, what is the relationship between the boiler pressure and system performance, is a higher pressure better as long as it dose not exceed the relief valve setting?

              Thanks
              Is it a steam boiler or a hot water "boiler" for heating purposes or a "boiler" for domestic hot water?

              The answer to your question depends upon the answer to the above questions!

              Very important!! If it is a steam boiler do not go anywhere near 15# as answered in a previous post!!!! Tell us what type of boiler then wait for the answer before messing with the pressure settings!!!
              Last edited by APHCO; 09-27-2009, 11:48 PM. Reason: add content

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              • #8
                Re: boiler pressure

                Mine is 12 lbs
                I can build anything You want , if you draw a picture of it , on the back of a big enough check .

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                • #9
                  Re: boiler pressure

                  12 pounds is OK for Hot Water heat at sea level or close to it. For steam it is dangerous and not necessary.

                  Someone from Colorado would have to tell you what is good at a higher altitude .

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                  • #10
                    Re: boiler pressure

                    12-15 psi for a two storey 18-20 psi for a three storey. Roughly 1/2 psi per foot of height to upper floor emitters, bear in mind this is for a hydronic system not steam.

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