Repair or Replace a Water Heater
If the tank body itself is leaking, replace; there is no repair. Below about seven years, component repairs are usually good economics. Past ten years, a significant repair is money into a unit whose remaining life is short.
Side by side
| Repair | Replace | |
|---|---|---|
| Typical cost | $180 to $700 | $1,000 to $3,200 |
| Time | 1 to 2 hours | 2 to 4 hours |
| Works for tank leaks | No | Yes, the only option |
| Best under 7 years old | Usually yes | Rarely justified |
| Best over 10 years old | Rarely justified | Usually yes |
| Triggers code upgrades | No | Yes: expansion tank, pan, venting, strapping |
| Warranty on the work | Parts and labour, typically 90 days to 1 year | New unit warranty, 6 to 12 years |
Costs are national editorial estimates for orientation, not quotes.
Repair
Pros
- Far cheaper in the immediate term
- Faster, and often same-day
- No code upgrades triggered, which avoids the surprise line items
- Sensible for a young unit with a discrete component failure
Cons
- Does nothing about the age of the tank itself
- On an older unit, another failure is likely within a short period
- Repeated repairs on an old heater often exceed the cost of replacing it
- Impossible for the failure mode that matters most, a corroded tank
Replace
Pros
- Resets the clock with a full manufacturer warranty
- Opportunity to correct undersizing, poor location, or missing safety equipment
- Brings the installation to current code
- Removes the risk of an imminent tank failure and flood
Cons
- Substantially more expensive up front
- Code upgrades add cost that homeowners often do not expect
- Usually requires a permit and inspection
- Wasteful if the existing unit had years of life left
In an emergency
The urgent case removes the choice: a tank leaking from the body cannot be repaired, and it will get worse. The other genuinely urgent signal is a T&P valve discharging, which means the tank is overheating or over-pressurized and needs diagnosis immediately. No hot water alone is not urgent and should be scheduled at standard rates.
The cost picture
A useful rule: if the repair costs more than half the price of replacement and the unit is past two-thirds of its expected life, replace. On a nine-year-old tank, a $600 gas valve repair against a $1,600 replacement is usually the wrong purchase.
Our recommendation
Let age and failure type decide rather than the immediate price. Under seven years with a component failure, repair. Over ten years with a significant failure, replace. Any leak from the tank body, replace regardless of age. In very hard water, shift those thresholds down by a couple of years, because tanks there genuinely fail earlier.
Repair suits
Units under seven years old with a discrete component failure: thermostat, element, thermocouple, or gas valve.
Replace suits
Any tank leaking from the body, units over ten years old with a significant failure, and any situation where the unit was undersized or badly located to begin with.
Frequently asked questions
My water heater is leaking. Is repair possible?
It depends entirely on where from. Leaks at the inlet or outlet fittings, the drain valve, or the T&P valve are repairable and often inexpensive. Water seeping from the bottom of the tank body means the inner tank has corroded through, and no repair exists for that at any price.
What code upgrades might I be forced into at replacement?
Commonly an expansion tank on a closed system, a drain pan and drain line if the heater is above living space, venting brought to current standard, and seismic strapping in California and some western states. These are conditions of a permitted installation rather than upsells, and they add $150 to $800.
How do I make the new one last longer?
Flush it annually to clear sediment, check the anode rod every few years and replace it when depleted, and address hard water with softening if you are in a hard water region. The anode is the sacrificial component protecting the tank; replacing a $30 rod on schedule is the highest-return maintenance available on a tank heater.
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