Thermal Expansion Tanks
Thermal Expansion Tanks | Tank Water Heater | Plumbing | Crab Orchard
From sudden temperature swings to fluctuating municipal pressures, Crab Orchard’s water system can put real stress on a tank water heater. HEP’s precision-engineered thermal expansion tanks absorb those pressure spikes before they can weaken joints, damage valves, or shorten the life of your appliance. Our licensed plumbers size the tank to your exact water-use habits, install it with code-compliant fittings, and verify that every PSI is dialed in for peak performance.
Customers tell us the difference is immediate: quieter operation, steadier hot-water delivery, and lower risk of costly leaks. Add the security of HEP’s satisfaction guarantee and 24/7 local support, and you’ll see why so many Crab Orchard neighbors trust us to protect their plumbing investment. Schedule your free assessment today and let our team keep your hot water flowing safely and efficiently year-round.
FAQs
What is a thermal expansion tank and how does it work with my tank water heater?
A thermal expansion tank is a small, pressurized vessel installed on the cold-water line near your tank water heater. Inside the tank is a rubber diaphragm that separates potable water from a cushion of air. When your water heater warms water, the liquid expands; the extra volume is pushed into the expansion tank instead of stressing pipes, valves, or the heater itself. Once hot water is used and pressure drops, the diaphragm pushes the water back into the plumbing system, keeping pressure balanced at roughly 40–80 psi.
Why do homes in Crab Orchard need a thermal expansion tank?
Most Crab Orchard residences are served by a municipal water system equipped with check valves or pressure-reducing valves (PRVs). These devices create a “closed” plumbing system where expanding hot water has nowhere to go. Without an expansion tank, pressure can spike 100 psi or more, leading to leaking relief valves, premature water-heater failure, and even burst supply lines. Local plumbing codes—as enforced by Cumberland County inspectors—require an expansion device whenever a closed system is present, so installing one keeps you compliant as well as protected.
How can I tell if my existing water heater needs an expansion tank?
Look for these signs: • A drip or steady trickle from the temperature-and-pressure (T&P) relief valve. • Frequent changes in household water pressure—very strong flow followed by weak flow. • Groaning or banging (water-hammer) noises when the heater cycles. • Presence of a PRV or check valve on your main line but no expansion tank near the water heater. A licensed Crab Orchard plumber can perform a simple pressure test: if static pressure increases more than 10 psi when the heater fires, an expansion tank is required.
What size expansion tank do I need for my water heater in Crab Orchard?
Sizing depends on three factors: water-heater capacity, incoming water pressure, and the water-heater’s set temperature. For the typical 40–50 gallon residential heater and 40–70 psi city pressure, a 2-gallon (often labeled "ST-5" or "Therm-X-Trol WX-203") tank is sufficient. Large 75–100 gallon heaters or high static pressures (over 80 psi) may need a 4.5-gallon tank. Your plumber will measure pressure, confirm heater volume, and consult the manufacturer’s chart to select the correct model.
How long does a thermal expansion tank last and what maintenance is required?
Quality expansion tanks last 5–10 years in Crab Orchard’s water conditions. Once a year, press the Schrader (air) valve briefly; if water escapes, the internal diaphragm has failed and the tank must be replaced. Also check that air pressure (with power to the water heater off and a faucet open) matches your static water pressure—usually around 50 psi. Add air with a bicycle pump if it’s low. During routine water-heater service, a plumber will inspect the tank for corrosion and proper support.
Can I install a thermal expansion tank myself or should I hire a plumber in Crab Orchard?
Handy homeowners can install one with basic tools—pipe wrench, Teflon tape, drill for support strap—but mistakes (improper orientation, wrong air charge, leaks) can void water-heater warranties or cause property damage. Because Cumberland County code requires correct placement, pressure testing, and a permit for plumbing alterations, most residents choose a licensed Crab Orchard plumber. Professional installation typically takes under an hour and costs far less than repairing pressure-related water damage.