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water heater: no hot water at all
The cheapest answer on this page costs nothing and the most expensive one is a repair: at these prices a tank past its tenth year is usually replaced before the meter reaches the median repair bill. The job here starts with a path rather than a part: you can smell gas anywhere near the unit, or the pilot will not stay lit after two attempts - leave the house and call the gas utility before anything else, and do not switch a light or a charger on or off on the way out [S1]. That is why no hot water at all belongs in the high-risk column before it belongs to any repair, and why the machine has to be isolated at the power and the water before anything else is touched. Pilot light out on a gas tank is the first suspect — no part needed [S1], about 15 minutes. Owners describe it as no hot water at all, the water is only lukewarm, hot water runs out after a few minutes, the shower goes cold partway through or the tank rumbles and pops while it heats.
the water is only lukewarmhot water runs out after a few minutes
Lukewarm rather than cold is the tell. On a two-element tank the lower element fails first and the upper one keeps heating the top of the tank, which is why S1 says you get fifteen or twenty minutes of warm water and then nothing at all. Its price for the job is $349, covering the drain-down, the element, a thermostat check, the anode rod inspection and the refill: the part is a small share of that and the labour is the rest. S1 reports these failures as very common on electric tanks six years and older in this market.
the source prices the job as a fitted repair at $349 - the element, the drain-down, the thermostat check, the anode rod inspection and the refill - and publishes no part-only figure, so the installed price is what stands here
failed thermostat, or a failed gas control valve [S1]
medium likelihoodadvanced$299–$349 installedabout 60 min
the water is only lukewarmthe shower goes cold partway through
Two control-side failures that look the same at the tap. An electric tank whose thermostat has stuck off gives lukewarm water, or water that swings between scalding and cold; a gas tank with a failed control valve does not light at all. S1 prices the electric thermostat and element check at $349 and the gas control valve replacement at $299, and it notes that the electric pair usually fails together, so this cause and the element above are often one visit rather than two.
priced as a fitted repair on both sides of the machine: $349 for the electric thermostat and element check, $299 for the gas control valve. Neither source publishes a part-only price for either, so the installed figures are what stand here
the water is only lukewarmthe shower goes cold partway through
The dip tube carries cold incoming water to the bottom of the tank; when it snaps off, cold water mixes at the top and the tank behaves like a much smaller one, which is what the source means by hot water that runs out fast. The anode rod is the sacrificial part that corrodes instead of the shell, and S2 says hard water depletes it in two to three years against four to six nationally. Both are jobs that only make sense on a tank with years left in it, which is what the decision below turns on.
neither source prices this job on its own. S2 bands it inside the group of major repairs it publishes at $1,200-2,000 - a full anode rod swap on hard-water systems, gas valve replacement, and dip tube replacement on systems showing rusty hot water - while S1 prices the small jobs at $249-349 and folds an anode rod inspection into its $249 flush. The same publisher therefore puts a gas control valve at $299 on one page and inside a $1,200-2,000 group on another; both figures are shown as published and neither is averaged, which is why no single price is claimed for this cause.
tank shell corroded through (the end of the road) [S4]
medium likelihoodpronot pricedabout 240 min
the tank rumbles and pops while it heatsthe water is only lukewarm
This is the sediment story at its end point, and S4 (ENERGY STAR) is the source that says the quiet part: corrosion around the lines or on the unit, rust in the water, and sediment that has cut the hot water available are signs the tank is breaking down rather than misbehaving, and S4 warns that ignoring them can end in a tank rupture and water damage instead of a cold shower. Its own decision line is age-based: past ten years, it is time to consider replacing the unit before the choice is taken away from you. Time basis: no source publishes a duration for a replacement, so the figure here is a book estimate for the swap and not a measured one.
a corroded or leaking tank shell is not a repairable part in either source. S1 sends it to replacement and S2 publishes the replacement row the decision above uses, so no separate repair price is claimed here.
Repair or replace?
Start with what is free: relight a gas pilot, reset the breaker once, and listen to the tank. After that the arithmetic on this machine is unusual, because the invoice data behind this page puts the median repair above the median replacement. S2's own records pay a $1,510 median across 51 completed water heater repairs against $849 across 22 full tank replacements, and S3's independent Philadelphia records put a replacement at a $700 median across 107 jobs. A $249-349 component fix is a repair under any reading. A $1,200-2,000 major repair is not: at that price the money buys a new tank with a new anode rod, a new warranty and no sediment history, and on a tank past its tenth year in hard water it buys the end of the fault rather than another chapter of it. [S2]
Water heater replacement, second market (Philadelphia suburbs), from a second published dataset: $700 median, middle half $562–$2,350 [S3] — n=107 completed jobs[S3]
The band above is one published row: 51 completed water heater repairs at a $1,510 median, with the middle half running from $253 to $1,791. That width is the shape of this fault rather than noise - the same source splits its own repairs into a cheap group ($89-300: a thermocouple, a temperature and pressure valve, a flush with an anode rod inspection) and a major group ($1,200-2,000: a full anode rod swap on hard-water systems, gas valve replacement, dip tube replacement on rusty-water systems). The replacement row is published separately (22 jobs), and the second market below is a different city with its own numbers, which is why nothing on this page is added together.
The half-of-new-price line falls near $300-560 against the $599-1,120 middle half of S2's replacement row, and every major repair on this page sits above it. That is the honest answer here: the cheap group is always worth doing, and the major group is the point at which a tank past its planning life is replaced rather than repaired again. S3's Philadelphia median of $700 is the lowest replacement figure on the page and its own stated budget band is higher, which is a disagreement inside one source rather than between two, and it is left standing as published.
S2 puts a Tampa Bay tank at eight to ten years against twelve to fifteen nationally, and its own pages attribute the difference to hard water depleting the anode rod faster and to sediment; S3 gives the same replacement signs with an age line of ten to twelve years. S4 (ENERGY STAR) treats a unit past ten years as due for replacement and its savings tables assume a thirteen-year life, which is a planning assumption in a savings calculation rather than a measured service life. The decision below therefore uses ten years and says plainly that no source here publishes a measured, sample-based lifetime for a tank.
A dark pilot window and no hot water anywhere in the house is the one cause here that usually costs nothing: S1's own first step is the relight procedure printed on the unit's sticker. If the pilot lights and then goes out again, the thermocouple or thermopile is the part, and S1 prices that replacement at $279. If you can smell gas, the source stops the job there and so does this page - leave the house and call the gas utility before anything else.
S1 ranks this second for a local reason: Tampa Bay's storm season trips 30-amp breakers, and a tank on a dead circuit simply stops. Reset it once and firmly. If it trips again immediately, the source says to stop rather than reset it a third time, because that pattern is a shorted element or thermostat, and repeated resets are how a $349 repair turns into a burned panel.
the tank rumbles and pops while it heatshot water runs out after a few minutes
Rumbling, popping and a shower that ends early are one fault: mineral sediment baked onto the tank floor, which insulates the water from the heat and takes up capacity the tank was sold with. S1 calls this universal in Tampa Bay and prices a tank flush with maintenance at $249, or $279 for a tankless unit. S5 (EPA WaterSense) describes the same flush as a homeowner job once a year with the power off. The two go together, because the sediment that makes the noise is also what corrodes the tank shell from the inside.
the source prices the service rather than a part - $249 for a tank flush with maintenance, $279 for a tankless unit - and S5 describes the same flush as a homeowner job with no part involved at all, so no part price is claimed
What each fix costs
Cause
Cost
Time
DIY?
pilot light out on a gas tank
no part needed
15 min
easy
tripped 30-amp breaker on an electric tank
no part needed
10 min
easy
broken dip tube or a spent anode rod
not priced
120 min
advanced
tank shell corroded through (the end of the road)
not priced
240 min
pro
sediment buildup from hard water
$249 installed
60 min
easy
failed thermostat, or a failed gas control valve
$299–$349 installed
60 min
advanced
failed heating element on an electric tank
$349 installed
90 min
advanced
A technician visit starts with a diagnostic fee of $0 [S2]. Completed repairs run $253–$1,791 [S2].
Sources
[S1]Home Therapist Cooling, Heating and Plumbing (Tampa Bay; FL licences CAC1819196 and CFC1431159; page published 18 April 2026, last reviewed 22 August 2026) (2026-04-18). the six ranked no-hot-water causes with the free checks and the walk-away gas rule (pilot light out, tripped 30-amp breaker, failed heating element, failed thermostat, sediment buildup, tankless flow or ignition fault); its own prices for each repair ($279 thermocouple or thermopile, $349 element with a thermostat check, $299 gas control valve, $249 tank flush and maintenance, $279 tankless descale); the lukewarm-not-cold signature of a dead lower element and the fifteen to twenty minutes of warm water it produces; the tank life it works to in this market (eight to ten years against twelve to fifteen nationally) with the six-month flush and twelve-to-twenty-four-month anode rod inspection; the $249-499 band it gives for most repairs; and the Florida permit requirement that applies to every replacement
[S2]Home Therapist Cooling, Heating and Plumbing (Tampa Bay; own Housecall Pro records, 2,523 completed service visits, published under CC-BY-4.0 30 April 2026, last updated 30 July 2026) (2026-04-30). the water heater repair row the decision band comes from: a $1,510 median across 51 completed jobs with the middle half at $253-1,791; the replacement row: a $849 median across 22 full tank replacements with the middle half at $599-1,120 and the source's own notes on what the two ends of that band are (a basic 40-gallon natural gas swap at the floor, hybrid heat pump, tankless and 75-gallon units above $1,200); the two groups it splits its own repairs into (cheap repairs $89-300: thermocouple, temperature and pressure valve, flush and anode rod inspection; major repairs $1,200-2,000: full anode rod swap on hard-water systems, gas valve replacement, dip tube replacement on systems showing rusty hot water); the market context it gives for the major group (8 to 11 grains per gallon of hardness, rusty hot water past eight years); the method behind the dataset (2,523 completed visits, $4,138,649 of customer-paid work, 135 ZIP codes, 24 technicians, 10 May 2024 to 30 April 2026, customer-paid totals between $50 and $50,000, free diagnostic visits excluded); and the statement that the seventeen published service rows do not sum to the 2,523 visits
[S3]McCorry Comfort (Huntingdon Valley, Pennsylvania; family-owned HVAC and water heating since 2001; page published 21 April 2026) (2026-04-21). the second market's replacement figures, from 107 water heater jobs the company completed between January 2024 and February 2026: an average of $1,602, a median of $700, 10th percentile $295, 25th percentile $562, 75th percentile $2,350, 90th percentile $3,225, minimum $150 and maximum $13,300; its own explanation that tankless and commercial-size installations pull the average above the median; the per-location breakdown with job counts (Philadelphia 37 jobs at a $1,675 average, range $150-3,890; Montgomery County 3 jobs at a $1,501 average); its stated budget bands for a standard 40-50 gallon gas tank ($1,200-2,000 in the same location, $1,500-2,500 with code upgrades), which sit above its own published median and are left beside it rather than averaged; the unit and installation cost split it publishes (40-gallon gas tank $450-800, 50-gallon $550-900, 40-50 gallon electric $400-700, installation labour $400-700); and the five replacement signs it lists (age over 10-12 years, rust-coloured water, water pooling at the base, rumbling from sediment, inconsistent hot water)
[S4]ENERGY STAR (U.S. EPA programme; article by Nate Jutras, dated 2 February 2024) (2024-02-02). the replacement trigger the decision uses - if you suspect your water heater is more than ten years old, it is time to consider replacing it before you are left with an emergency decision - with the installation-date lookup it describes; the five failure signs it lists (visible corrosion around the lines or on the unit, water leaking from joints, seals or seams, rust in the water, sediment reducing the hot water available, and rumbling or vibrating noises); the warning that ignoring them can end in a tank rupture and water damage rather than a cold shower; and the thirteen-year lifespan its heat pump payback table assumes, which is a planning assumption inside a savings calculation rather than a measured service life
[S5]EPA WaterSense (U.S. Environmental Protection Agency; page last updated 16 June 2026) (2026-06-16). the maintenance schedule that keeps this fault away, described as a homeowner job: a once-a-year flush to reduce sediment buildup (with the power supply off), an annual check that the temperature and pressure relief valve functions, and a regular visual inspection for leaks, aged gaskets, loose connections and corrosion; and the service pressure range it gives for water-using fixtures (45 to 60 pounds per square inch), which is the background condition for the sediment this page prices
Last verified: 2026-09-20. Prices are US market figures from the sources above; your quote may differ.
Built from a fact record, not from a template: every number above is tied to one of the sources and the record is re-checked against them. Editorial choices (which symptom leads, which cause is the single tell) are kept in a separate block so the facts stay auditable.
Quick answers
How much does it cost to fix a water heater with this problem?
Completed repairs run $253–$1,791 according to the sources cited on this page, after a diagnostic fee of $0.
How long does a water heater last?
The decision rule used on this page works from a planning life of 10 years.
Repair or replace?
Start with what is free: relight a gas pilot, reset the breaker once, and listen to the tank. After that the arithmetic on this machine is unusual, because the invoice data behind this page puts the median repair above the median replacement. S2's own records pay a $1,510 median across 51 completed water heater repairs against $849 across 22 full tank replacements, and S3's independent Philadelphia records put a replacement at a $700 median across 107 jobs. A $249-349 component fix is a repair under any reading. A $1,200-2,000 major repair is not: at that price the money buys a new tank with a new anode rod, a new warranty and no sediment history, and on a tank past its tenth year in hard water it buys the end of the fault rather than another chapter of it.