About this example
This scenario is made up for illustration. It describes no real household, contractor or job, and it implies no price or timeline.
A household in Orange recently replaced an old gas tank. A few weeks later, they find a small puddle each morning at the end of the relief valve discharge pipe.
What happened
Illustrative example. Not a real job or customer.
The drip appears mostly overnight and after long periods of no hot water use. During the day it rarely drips. The water is warm, not scalding, and there's no gas smell.
- The owners note the pattern in a symptom log.
- They resist the temptation to cap the discharge pipe, knowing the valve is a safety device.
- A licensed plumber measures household water pressure and watches it rise as the tank heats with no taps open.
- The plumber explains that heated water expands, and when the plumbing system can't absorb that expansion, pressure climbs until the relief valve opens.
The plumber recommends a pressure-control solution suited to the home's plumbing and confirms the relief valve itself is fine. The drip stops.
Bad valve versus real pressure
Worn valve
- Drips steadily regardless of use
- Often follows a test lift that didn't reseat
- Pressure readings normal
Thermal expansion or high pressure
- Drips after heating cycles or overnight
- Pressure climbs when the tank heats
- New valve would drip too
Questions the owners asked
- What is our water pressure, and is it within a normal range?
- Why did this start only after the new heater went in?
- What pressure-control option fits our plumbing?
Common questions
Is this case real?
No. It's a hypothetical example to explain how relief valve drips are diagnosed.
Why would a new heater cause this?
A new installation can change how the system handles expansion, and pressure issues that were masked before may show up.
Should the installer have caught it?
Ask about expansion and pressure as part of any replacement estimate. It's a reasonable item to include.
General information for Orange, not a quote or professional advice. In an emergency, call 911.