Boiler leaking water from bottom of cabinet

Safety: Turn off power and close the boiler isolation valves if present. Hot water can cause burns.

• Step 1 – Identify leak source: Remove the front cover of the Triangle Tube boiler and use a flashlight to trace where water originates. Check around the pressure relief valve, pump flanges, and heat exchanger connections.
• Step 2 – Relief valve check: If water is dripping from the relief valve discharge pipe, check system pressure. High pressure may indicate a failed expansion tank or overfilling.
• Step 3 – Tighten fittings: Carefully tighten any accessible unions or threaded fittings that are seeping, but do not overtighten.
• Step 4 – Condensate vs. system water: Determine if the leak is clear condensate from the trap/line or system water (often treated and may be discolored). Repair condensate leaks by reseating hoses or replacing the trap.
• Call a technician: If the leak is from the stainless steel heat exchanger, internal piping, or relief valve, a professional should replace the faulty component and test the system.