Why Is My Water Heater T&P Valve Discharging Water?
CANRO Heating & Cooling provides expert advice on this common question for homeowners in Greater Vancouver. If you need professional service, our licensed technicians are available across the region.
Related Services from CANRO
CANRO Heating & Cooling provides comprehensive water heater service across Greater Vancouver, including diagnostic inspections, emergency repairs, scheduled maintenance, and system replacement. Our Red Seal certified technicians service all major brands and carry OEM parts in their vehicles. For emergency service related to this question, call (604) 359-1081.
Answer: Why Is My Water Heater T&P Valve Discharging Water?
The Temperature and Pressure (T&P) relief valve is a safety device that discharges water if the temperature exceeds 210°F or pressure exceeds 150 PSI. If you notice water dripping from the T&P discharge pipe, the valve is doing its job — but the underlying condition that caused it to open needs attention. Common causes include: water temperature set too high (above 140°F / 60°C), water pressure exceeding 80 PSI (install a pressure reducing valve on the main water supply), thermal expansion with no expansion tank installed (required on closed plumbing systems, which most Vancouver homes with newer water meters have), a faulty T&P valve that has worn out and leaks without an over-temperature or over-pressure event, or sediment buildup that causes localized overheating. A T&P valve that drips continuously should be replaced promptly — if it fails, a water heater can explode.
When to Call a Professional for Help
While understanding the answer to this question is helpful, some situations require professional expertise. If you are uncertain about any step, if the problem recurs, or if you notice any signs of gas odour, carbon monoxide, or electrical hazards, contact CANRO Heating & Cooling immediately. Our licensed technicians across Greater Vancouver can provide expert diagnosis and repair. We recommend professional service for any issue that involves gas, electrical components, or safety-critical systems.
Safety Reminder
If you smell gas, suspect carbon monoxide or believe there is an immediate danger, leave the property and contact emergency services or the appropriate gas emergency authority. Do not remain inside — exit the building immediately and call for help from outside.