I have a residential oil fired boiler with a relief valve set at 30 # and the pressure on the boiler reads 13#. Is this simply an old valve or could there be another issue? Its a slow leak . A drip every 6 seconds . Any advice would be appreciatted.
Thanks for your replies. The valve between boiler and expansion tank was leaking as well. I was able to tighten the valve and it stopped leaking. I will replace the pressure valve tomorrow.