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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.
3 psi is too low. I can tell you how to add water to the system. It would be much easier if you could give me some pictures of the boiler and surrounding piping. You can post pics here by clicking on ADD FILES next to the SEND button.