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Max pressure on old Burnham cast iron baseboards

Hydrostatic Test pressure is 30 psi. But that is with water and not air. It is not recommended that you use air for testing. This is addressed on page 11 of the I&O manual. here is a link to that manual.


Glenn Stanton

Manager of Technical Development

Burnham Hydronics

U.S. Boiler Co., Inc.


  • radioconnection_2
    radioconnection_2 Member Posts: 70
    Max. air pressure test on old Burnham cast-iron baseboards?

    What is rated maximum pressure that can be safely applied to older Burnham cast iron baseboards? I need to pressurize a few zones one at a time with air pressure to find which heating loop has a slow leaker. I don't want to risk damaging anything. The boiler will be off the loops during the tests.

  • tim smith
    tim smith Member Posts: 2,752
    I think its 50 psi

    But Glenn Stanton can answer this for sure.
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