TPR Valve Replacement
That little side pipe dripping? Your TPR valve is either worn out or warning you about pressure. We figure…
The small tank behind the big problem
Expansion Tank Service in Apache Junction, AZ
That little tank hanging above your water heater is the expansion tank, and when its internal bladder fails, pressure spikes have nowhere to go — so your TPR valve starts discharging and your plumbing takes a beating. Half the ‘mystery’ TPR drips we see trace back to this one component. Call (833) 713-2101. Certified Professional, Licensed & Insured Team.
Call Now(833) 713-2101
- ✓ Certified Professional
- ✓ Licensed & Insured Team
- ✓ No-Nonsense Diagnosis
- ✓ Clear Explanations
About this service
What the expansion tank does — and how it dies
Water expands when heated. In a closed plumbing system (which most homes with a pressure regulator or check valve have), that extra volume has nowhere to go — so pressure spikes every heating cycle. The expansion tank absorbs it: water pushes against a rubber bladder with an air cushion behind it. When the bladder ruptures or the air charge leaks out, the tank goes waterlogged and stops absorbing anything. Pressure spikes return, the TPR valve weeps to relieve them, and every joint in the house gets hammered.
The tell is simple: tap the tank. A healthy one sounds hollow at the top; a waterlogged one thuds solid, and may feel heavy. Replacement is quick, but the detail that matters is the pre-charge — the new tank’s air pressure must match your home’s static water pressure (normal is 40–60 psi), set with the system depressurized. Wrong pre-charge and the new tank barely works. If your TPR valve drips regularly, check the expansion tank before you blame the valve — or call (833) 713-2101 and we will check both.
How it works
What to expect
Test bladder and air charge
Tap test, pressure check with the system drained down — we confirm whether the tank is waterlogged or just under-charged.
Measure your static pressure
A gauge on the system tells us the number the new tank’s pre-charge must match.
Install the replacement
Correctly sized for your water heater, supported properly — these tanks are heavy when full and should not hang by the pipe alone.
Set pre-charge precisely
Air charge matched to your static pressure with the system depressurized. This step is the whole job, really.
Verify the system calms down
Heating cycle run, pressure watched, TPR valve dry. The drip should be gone because the cause is gone.
FAQ
Expansion Tank Service questions
How do I know if my expansion tank is bad?
Tap it: hollow ring at the top is good, a dull thud means it is waterlogged. A TPR valve that drips after every heating cycle is the other classic symptom.
Can I just add air to the old tank?
If the bladder is intact but the charge leaked down, sometimes. If the bladder ruptured — the common failure — no amount of air fixes it. We test before we replace.
Why does the pre-charge pressure matter?
The air cushion only absorbs expansion if it is set to your home’s static pressure. Set wrong, the tank does almost nothing and the TPR keeps dripping.
Related services
You may also need
Water Heater Drain Valve Repair
The drain valve at the tank base is the first thing hard water kills. We swap failed plastic and crusty brass…
Leaking Fitting and Connection Repair
Wet around the top of the tank? Inlet and outlet fittings loosen and corrode with years of heat cycling. We…
Tankless Water Heater Leak Repair
No tank to fail, but tankless units still leak: condensate lines, isolation valves, heat-exchanger seals. We…
Leak Pan and Drain Line Installation
A pan under the tank with a real drain line turns a future leak into a non-event. We size it right, pitch the…
Gas Water Heater Leak Repair
Water plus a gas burner demands respect. We shut the gas down first, fix the water-side leak, then verify…
Electric Water Heater Leak Repair
Element gaskets and thermostat covers are the electric-only leak points. Power off at the breaker, gaskets…
Water Heater Shutoff Valve Replacement
The shutoff on your cold-water inlet is your first defense in a leak — but old gate valves seize solid. We…
Emergency Water Heater Leak Repair
Some leaks cannot wait: water spreading across the floor, a burst fitting, a tank discharging heavily. Here…
Water Heater Replacement
When the tank shell itself has failed, honest replacement beats another repair. We size the new unit to your…