TPR Valve Replacement
A dripping temperature-pressure relief valve is either tired or talkative: worn out, or warning about excess pressure. We test with a gauge, check the expansion tank, and replace the valve with the right rating.
Emergency Quick Call
Expansion Tank Service in Medford, MA
Every time your water heater fires, the water inside expands — and in a closed plumbing system, that extra volume has nowhere to go. The expansion tank is the somewhere: a small steel tank with a rubber bladder inside, half air and half water, that compresses to absorb the surge. When the bladder fails, the cushion is gone, pressure spikes with every heat cycle, and the T&P valve starts discharging to do the tank’s job for it. Our expansion tank service in Medford, MA tests the bladder and air charge, replaces failed tanks, and sets the pre-charge to match your home’s static pressure. Call (833) 713-2101. Certified Professional, Licensed & Insured Team.
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About this service
The shock absorber in your plumbing
Picture the bladder as a balloon inside the tank: one side holds the house water, the other holds compressed air, and the balloon flexes as water expands and contracts. The air side is pre-charged — typically to match the home’s static water pressure, which in most homes runs 40 to 60 psi. Over time the bladder can rupture or the air charge can bleed away; either way the tank becomes waterlogged, a steel lump with no give, and every heat cycle hammers the system with a pressure spike.
The symptoms are classic: a T&P valve that discharges after every long heating cycle, pressure readings that climb well above static, sometimes water hammer for company. Service means testing the air charge with the system depressurized, checking the bladder, and replacing the tank when it has failed — then setting the new tank’s pre-charge to match your home’s actual static pressure, not a guess. That matching is the whole game: an expansion tank charged wrong is barely better than a failed one. For expansion tank service in Medford, MA, call (833) 713-2101.
How it works
Expect this
Read the static pressure
A gauge on a hose bib tells us what the house runs at rest — the number everything else gets matched to.
Test the bladder and charge
With the system depressurized, we check the tank’s air charge and test whether the bladder still holds it.
Replace failed tanks
A ruptured bladder or a tank that will not hold charge gets replaced with the correctly sized unit.
Match the pre-charge
The new tank’s air charge is set to the home’s actual static pressure — the detail that makes the absorber absorb.
Verify under heat
We run a full heat cycle and watch the pressure gauge: the spike should be gone and the T&P valve quiet.
FAQ
Your Expansion Tank Questions, Answered
How do I know my expansion tank has failed?
The classic sign is the T&P valve discharging after long heating cycles, or pressure readings that climb far above your home’s resting pressure. A quick field test: tap the tank — a healthy one sounds hollow at the top (air) and solid at the bottom (water); a failed one sounds solid throughout.
Why does the pre-charge have to match my house pressure?
The air cushion only works when it is tuned to the system. Set too low, the bladder over-extends; set too high, the tank never engages. Matching pre-charge to static pressure — usually 40 to 60 psi in homes — is what lets the tank absorb each heat cycle’s expansion.
Can a bad expansion tank really cause the T&P valve to leak?
It is one of the most common causes. With no cushion, each heat cycle spikes the pressure, and the T&P valve does exactly what it was built to do — open near its trip point and dump water. Replace the messenger all you like; until the tank is fixed, the dripping continues.
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