Water heater is leaking water from the bottom of the casing.

Safety: Turn off power and close the cold water isolation valve immediately to prevent further damage.

• Remove front cover: Place a tray under the unit and carefully remove the casing to locate the leak source.
• Check unions and fittings: Tighten any loose compression or union nuts on inlet/outlet pipes.
• Inspect heat exchangers: Look for signs of corrosion or pinhole leaks on the primary and plate heat exchangers. Green or white deposits often indicate slow leaks.
• Check plastic components: Examine the hydraulic block and flow sensor housing for cracks.
• Replace faulty parts: Replace the leaking component (heat exchanger, gasket, or hydraulic block). This often requires draining the unit and should be done by a professional.