Quick answer
Repair thermostats, elements, igniters, or valves on a tank under 8–10 years old — most of those fixes run $200–$800 and restore full service. Replace when the tank leaks from the shell (never repairable), it's past 10–12 years, rust shows in the hot water, or the repair quote crosses a third of the $3,000–$4,500 a new tank installs for in the Puget Sound. And if you're replacing anyway, spend five minutes on the heat-pump option before defaulting to like-for-like.
- Water pooling under the tank from the shell itself = replacement, at any age. No component fix helps a corroded tank.
- No hot water on a young tank is usually a $200–$800 component repair: element, thermostat, igniter, or gas valve.
- Past 10–12 years, put repair money toward the $3,000–$4,500 replacement instead — the tank's clock is nearly out either way.
- Replacing anyway? A heat pump water heater cuts electric hot-water costs ~70% and rebates (WA HEAR up to $1,750 + utility programs) shrink the premium.
Use this guide when
You woke up to a cold shower and need to know if it's a cheap fix or a replacement, you found water under the tank, or your water heater is grinding past year ten and you'd rather decide calmly now than during a Friday-night failure with the garage flooding.
What actually drives the decision
Where the failure is and how old the tank is. Component failures (heating elements, thermostats, igniters, gas valves) are repairable; shell failures (rust-through, leaks from the tank body) are not — the tank is a sealed pressure vessel and corrosion through the wall is terminal. Age sets the economics: tanks last 8–12 years here, so a $600 repair at year eleven is buying months, not years.
Compare your options
Repair when
The tank is under 8–10 years old, holds water without shell leaks, and the failure is a component: no hot water (element or thermostat on electric, igniter or gas valve on gas), lukewarm output, or a weeping fitting or T&P valve. These fixes typically run $200–$800 and are same-day work.
Replace when
The tank leaks from the shell, rust tints the hot water, it rumbles from years of sediment, it's past 10–12 years, or the repair quote crosses a third of replacement. A standard tank swap runs $3,000–$4,500 installed in the Puget Sound including permit, expansion tank, seismic strapping, and code fittings.
The upgrade question
Replacement day is decision day, because the efficient options only pencil when you're buying anyway: a heat pump (hybrid) water heater at $4,500–$7,000 before rebates cuts electric water-heating costs by ~70%, and WA HEAR takes up to $1,750 off at point of sale for income-eligible households with utility rebates stacking on top. Tankless ($5,500–$9,500) suits households that outrun a tank. Both deserve a look before another builder-grade tank locks in 10 more years of the status quo.
Key terms and context
This guide is written for plumbing decisions in the Puget Sound. It uses the same terminology you'll hear from inspectors, technicians, and permit offices.
Repairing a rusted tank
Water on the floor from the tank shell means internal corrosion has broken through — the vessel itself has failed, and no element, valve, or thermostat changes that. Money spent 'repairing' a leaking tank is lost twice: once on the repair, again when the tank fails fully, sometimes as a flood. Shell leak = replacement conversation, immediately.
Emergency-day defaults
A failed water heater pressures you toward the fastest identical swap — which forfeits the one moment when upgrading to a heat pump unit or tankless costs the least extra. If your tank is past ten years, get the comparison quote now, while it still works. Deciding calmly beats deciding wet.
How we build this guidance
- We show you the failed component — or the shell corrosion — before recommending repair or replacement.
- Replacement quotes include the heat-pump and tankless comparison with rebate math, not just the like-for-like number.
- Upfront flat-rate pricing before any work begins.
Methodology: Repair-vs-replace thresholds from Eco field policy against 8–12 year tank lifespans; price ranges align with Eco's published Puget Sound water-heater cost guide; rebate figures per 2026 WA HEAR and utility program rules.
Last updated: 2026-07-05
Ready for the next step?
Get a free, no-obligation estimate from Eco — honest range before any work begins.
Continue exploring
Common questions
How fast can a failed water heater be replaced?
Often same-day in the Puget Sound when you call in the morning and a standard tank fits your setup — we confirm timing and inventory when you call. Heat pump and tankless conversions take longer because of electrical or venting work, which is another reason to compare options before the old tank fails.
My water heater still works but it's 12 years old. Should I replace it proactively?
It's the rare appliance where proactive replacement genuinely pays. Tanks past their 8–12 year lifespan don't usually fail politely — they leak, sometimes as a flood over finished floors. Replacing on your schedule means choosing the right unit, capturing rebates, and skipping water-damage remediation. At minimum, put a leak-detection pan and alarm under any tank past ten.
Why is there water under my tank but nothing looks broken?
Trace it before assuming the worst: condensation, a weeping T&P relief valve, or a loose fitting can all pool water and all are repairable. Water seeping from seams in the tank body, or rust streaks down the shell, mean the vessel itself has failed — that's a replacement. We diagnose the source before quoting anything.
Is it worth switching from electric tank to a heat pump water heater at replacement?
If the tank lives in a garage, basement, or utility room, usually yes: it uses about 70% less electricity, WA HEAR takes up to $1,750 off at point of sale for income-eligible households, and utility rebates (PSE, Seattle City Light, Snohomish PUD) can stack. The premium over a standard tank often recovers in a few years of bills — see our tank vs heat pump comparison for the full math.