Temperature & Pressure Relief Valve Replacement Cost
The T&P valve is the safety device that opens if the tank overheats or over-pressurizes. A dripping or stuck one must be fixed — price the valve and labor here.
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The temperature-&-pressure valve is a safety device — a dripping or stuck one must be fixed (about $198). The discharge piping and code details are a plumber’s call; this only estimates the cost.
The temperature & pressure (T&P) relief valve is the water heater’s most important safety part. If the tank ever overheats or over-pressurizes, the valve opens and releases through a discharge pipe rather than letting the tank fail. It is a $15–$40 part, and its labor is modest — but this is the one repair you should not defer.
Be precise about the diagnosis, because a dripping T&P valve has two very different causes. Sometimes the valve itself is worn and simply needs replacing. Just as often the valve is doing its job because system pressure is too high — a closed system with no expansion tank, or a high incoming pressure — and swapping the valve without fixing the pressure means it will weep again. Treat a persistently dripping valve as a message, not a nuisance.
Formula
total = (T&P valve + labor) × (1 + contingency%)
The part is cheap and consistent; the labor covers the drain-down and the swap. The contingency covers the discovery that the real problem is pressure — needing an expansion tank or a pressure-reducing valve, which are separate line items.
Worked example
The valve is weeping. The part is $20, labor is $160, and you keep the 10% buffer.
(20 + 160) × 1.10 = 180 × 1.10 = $198
About $198 for the valve swap — but if the cause was high pressure, budget separately for an expansion tank or a pressure-reducing valve, or the new one will drip too.
Worn valve, or is your pressure too high?
Check first. Is the valve weeping, or is it discharging because pressure is high? A pressure gauge on a hose bib tells you. If pressure spikes when the burner fires, you likely need an expansion tank — fix the cause, not just the symptom.
Safety and code. Never cap or plug a T&P valve — it is life-safety. The discharge pipe routing, size, air gap and termination are governed by local code; that piping and the pressure diagnosis are a licensed plumber’s call. This tool only estimates the cost.
Reference table
LABELED planning typicals — the part and the labor on your job come from your own quote. Notice the pattern: on most repairs the part is cheap and the labor (the service call) is the real cost, so the biggest lever is whether a trip charge and a minimum apply.
| Repair | Typical part | Typical labor | Common symptom |
|---|---|---|---|
| Heating element (electric) | $10–30 | $150–300 | No / not enough hot water |
| Thermostat | $20–40 | $150–250 | Water too hot, too cold or swinging |
| Anode rod (preventive) | $20–60 | $100–200 | Rotten-egg smell, rusty water |
| Temperature & pressure (T&P) valve | $15–40 | $120–250 | Valve dripping or weeping |
| Thermocouple (gas) | $10–30 | $100–200 | Pilot won’t stay lit |
| Gas control valve | $100–300 | $150–300 | No ignition / no gas |