Water heater replacement is a small project with a large gap between the simple and complex versions: a like-for-like tank swap versus a conversion to a tankless or heat-pump unit.
What the permit filings show
Based on 292 residential building-permit filings. The median water heater replacement valuation runs from $7,000 in San Francisco to $10,000 in Austin, about 1.4× the cheapest city. Within a city the spread matters too: the middle half of Austin filings spans 250% of its median, versus 162% in Chicago.
CityTypical range (P25–P75)MedianFilings
San Francisco$3,500 – $18,730$7,00047
Chicago$3,581 – $15,500$7,336183
Austin$5,000 – $30,000$10,00062
Filings are declared valuations from each city's open permit dataset, limited to residential records classified as water heater replacement work and valued between $1,000 and $2,000,000. A city is listed only when at least 30 filings qualify. Full methodology. Data refreshed September 2026.
What the numbers say
Sample size varies by city too — 183 qualifying water heater replacement filings back the Chicago figures above, versus just 47 for San Francisco — and while both clear the site's 30-filing minimum, Chicago's far larger sample settles into a steadier shape than San Francisco's, which sits closer to that threshold.
Zoom out across every city on this page and the legitimate range is wider still: the lowest 25th-percentile figure is $3,500, in San Francisco, and the highest 75th-percentile figure is $30,000, in Austin — a 8.6× gap that reflects different cities, codes and building stock, not overcharging.
In Chicago, quotes cluster tightly: the middle half of filings sits between $3,581 and $15,500, so a quote near the $7,336 median there is the safer assumption. In Austin, that band runs from $5,000 to $30,000 — wide enough that a quote toward either edge is still plausible, so treat Austin's median as a starting point for a conversation, not a target.
Replacement versus conversion
A tank-for-tank swap reuses existing connections and is quick. A tankless conversion may need larger gas supply, new venting or electrical work, and a heat-pump unit needs space, drainage and sometimes ventilation. Those extras are why permit valuations for water heaters are more spread out than the equipment prices alone would suggest.
Planned versus emergency installs
Replacing a heater before it fails gives you time to compare quotes and choose the right size and fuel. An emergency replacement, with no hot water, leaves little room to negotiate. If your unit is near the end of its life, a planned swap is usually the cheaper route.
What to confirm
Check capacity, efficiency and warranty, and confirm what is included for expansion tanks, discharge pipework, permits and disposal of the old unit.
What drives the cost of water heater replacement
Fuel type and unit type set the baseline: a like-for-like gas or electric tank swap is the simplest and least expensive version of this project, while switching to tankless or a heat-pump water heater is a different scope entirely.
Venting is the most common source of extra cost on a conversion. A tankless unit often needs different venting than the tank it replaces, and a heat-pump unit needs enough surrounding air space and a condensate drain that a simple tank never required.
Capacity and household demand influence unit size and, with it, installation complexity — a larger tank or a tankless unit sized for a bigger household can need larger gas or electrical supply than what is already in place. Code-required additions such as an expansion tank or updated shutoff valves are inexpensive individually but are commonly bundled into the installed price rather than the unit price alone.
A worked example
Take Chicago, the city with the most filings behind its figures (183). Suppose two contractors quote for the same water heater replacement: one at about $7,336, in line with the local median, and another at about $18,500, well above the local P75 of $15,500.
Neither figure alone says which contractor is right: $7,336 sits where most Chicago filings land, a reasonable opening point, while $18,500 sits above where three-quarters of them do — not necessarily a red flag, since a tankless or heat-pump conversion, or new venting and gas work, can all justify it — but a scope worth having spelled out before you sign. Both figures are illustrative.
What a water heater permit valuation leaves out
The declared valuation covers the unit, connections, required safety components and labor as filed. It is not the same as a final paid invoice, particularly for an emergency replacement.
Gas line upsizing, electrical circuit changes, or venting modifications needed for a tankless or heat-pump conversion are the kind of extras that turn a simple swap into a larger job, and they don't always show up clearly in a permit filed as a straightforward replacement.
Disposal of the old unit and any drywall or access-panel repair needed to reach the water heater are minor individually but are inconsistently included from one contractor quote to the next.
Use your quote to test the range
What this project can cover
Water-heater replacement generally covers the unit, connections, isolation valves, disposal, and required venting or safety components.
What may sit outside it
Tankless or heat-pump conversions can require new gas, electrical, drainage, or ventilation work beyond a like-for-like swap.
Checks before you accept a quote
Compare capacity, efficiency, warranty, and fuel type.
Confirm expansion tanks, discharge pipework, permits, and disposal.
Ask for the cost difference between planned and emergency installation.
Questions to ask before you sign
Is this a like-for-like tank swap, or does it require new venting, gas or electrical work?
What capacity and efficiency rating is being quoted, and does it match the household's actual hot-water demand?
Does the price include an expansion tank, updated shutoff valves and any code-required strapping?
Is this an emergency replacement, and would waiting for a planned installation change the price?
What is the warranty on the tank versus the labor, and who handles a warranty claim?
Does the quote include disposal of the old unit and any access-panel repair?
Questions people ask
Why is a tankless conversion so much more than a tank swap?
A tankless unit frequently needs different venting and sometimes larger gas supply than the tank it replaces, and that supporting work — not the unit itself — is usually what drives the price above a simple swap.
Does an emergency replacement cost more than a planned one?
It can. A planned replacement gives you time to compare quotes and select the right size and fuel type; a same-day emergency swap because there's no hot water leaves far less room to shop around.
Do these figures include a permit and inspection fee?
Municipal permit and inspection fees are typically small relative to the installation and are inconsistently itemized between quotes — ask your plumber whether the fee is included or added on.
Is a heat-pump water heater priced the same way as a tankless unit?
No — they're different technologies with different installation needs (a heat-pump unit needs surrounding air space and a condensate drain, not different venting), so treat the two as distinct projects even though both differ from a simple tank swap.