Reliance Water Heater Leaking: Find the Source
The Short Answer: Water at a Reliance is a plastic drain valve, T&P discharge, a rotten nipple, an element gasket, or the steel shell. It is an AO Smith / State tank in a different jacket. Wipe, wait, and name the wet part. A bead at the drain is a valve. A wet jacket with rust at the seam is a replacement — today. Generic map: leaking from the bottom.
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Search Intent & The Real Problem
You found a puddle. The internet said the tank is shot. Reliance 6-year and 9-year builder tanks use the same cheap plastic drain, the same dielectric nipples, and the same glass-lined steel as the rest of the American / State line. Gravity lies: T&P water, a SharkBite, or a hot-side union runs to the pan and looks like a bottom leak. Split those before you buy a heater.
What other guides get wrong
They treat every Reliance drip as a cracked tank, then recommend sealant on the shell. A glass-lined tank with a hole is scrap. They skip the paper-towel test, so a plastic drain gets condemned, or a T&P drip gets a new heater while house pressure is 110 psi.
Step-by-Step Troubleshooting
Step 1: Name the wet part
| Wet location | Likely source | Next |
|---|---|---|
| Hose threads / cap of the drain | Valve not seated, grit on the seat | 3/4” brass, not more plastic |
| Pipe threads of the drain at the tank | Cross-thread or bushing weep | Stop if the bushing turns |
| T&P discharge pipe to the floor | Pressure or temperature | Gauge the house; never cap |
| Cold or hot nipple / dielectric / flex | Failed nipple or connector | Nipple or listed flex |
| Upper or lower element (electric) | Gasket or stripped tank threads | Element + gasket if the shell is dry |
| Anode hex on top, water tracking down | Weeping plug | Anode, not a “bottom leak” |
| Jacket, foam, rust streak at the base | Tank shell | Replacement |
| Gas: rust ring at the burner / wet tray | Tank into the combustion chamber | Shut gas. Replacement |
- What to look for: Dry it. Wait two minutes. Wipe again. A drain-valve bead stays on the hose thread. A dead tank wets insulation in a patch that returns.
- Required tools: Paper towel, flashlight.
Step 2: Kill energy and water the right way
- What to look for: Electric: double-pole breaker off (a 4500 W / 240 V element is ~18.8 A; confirm dead). Gas: control to off / gas cock off. Cold inlet off. Hot faucet open so the tank can breathe.
- Required tools: Breaker lock or gas cock, hose, pan. No floor drain? This drain procedure.
You do not empty a 50-gallon to diagnose. You drop the level below a drain valve only if that valve is the repair.
Step 3: Drain valve, nipples, elements — the saves
- What to look for: Factory plastic 3/4” drain that cracked or packed with grit. Dielectric nipple weeping behind a connector. Lower-element gasket on a dual-element electric. Wires lifted, power verified dead: a healthy 4500 W / 240 V element is ~12–13 Ω across the screws; any screw-to-tank continuity is a grounded element — that is heat, not the leak, but it tells you the tank’s age.
- Required tools: Two wrenches with a backup on the tank bushing, 3/4” brass ball drain, potable PTFE or dope. Meter only with the breaker locked off.
If the tank bushing spins with the valve, stop. That is how you oval the opening and buy a heater.
Step 4: T&P water that ran to the pan
- What to look for: Static pressure over 80 psi at a hose bib. Waterlogged expansion tank (Schrader spits water). T&P that dribbles after someone lifted the test lever. Typical relief 150 psi / 210°F. Same physics as T&P after testing.
- Required tools: Hose-bib gauge, tire gauge on the expansion tank.
Never plug the T&P. A stream is shut down and a licensed call.
Step 5: When it is actually the tank
- What to look for: Water returning at the jacket with every fitting dry. Rusty water, popping for years, anode never changed, tank 6–12 years in hard water. Pinholes at the bottom head. Gas: water in the burner tray — carbon monoxide if you keep firing it. Related: dripping on the burner.
- Required tools: None. Do not epoxy, Flex Seal, or “tank repair kit” a pressure vessel.
When DIY Ends: Calling a Licensed Pro
Stop if the closet is flooded near 240 volts, the bushing spins, the jacket is wet, you smell gas, or the T&P is streaming. A plastic drain on an otherwise dry tank is a homeowner job if you can isolate it. A leaking shell is a permitted replacement in many cities. Same-day licensed swap beats a collapsed subfloor.
Frequently Asked Questions
Q: Why is my Reliance water heater leaking? A: Drain valve, T&P discharge that ran down, a nipple or element gasket, or the steel shell. Wipe each part. A bead at the drain is not a dead tank. A wet jacket is.
Q: Can I repair a leaking Reliance tank? A: You can replace a drain valve, a nipple, or an element gasket. You cannot repair a hole in the tank. Sealant on the shell is a delay until the floor fails.
Q: Should I shut a leaking Reliance off? A: Yes if it is more than a slow valve weep you are about to replace, and always if the jacket is wet or the pan is filling. Close the cold inlet, kill power or gas, and keep the T&P open to atmosphere.