Storage tank
$1,600–$2,400Typical cost, including installation
WATER HEATER REPLACEMENT IN OAKVILLE
Oakville Water Heater
Replacement
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See what replacement costs ↓OAKVILLE AT A GLANCE
Replacing a water heater in Oakville.
Oakville is an unincorporated community in south St. Louis County along the Mississippi and Meramec rivers. A water heater replacement needs a St. Louis County no-plan plumbing permit, bought online for $47. Every new heater needs an expansion tank, and the installer must be a county-licensed master plumber or water heater replacement specialist. Oakville homes are on Ameren Missouri electric, Spire gas and Missouri American Water.
Oakville is an unincorporated community in St. Louis County, so county offices handle permits.
- Permit to replace with the same type
- Yes · St. Louis County Department of Transportation and Public Works (Code Enforcement) – unincorporated St. Louis County
- Permit fee
- One fee of $47 to replace a home water heater; the separate $47 processing fee doesn't apply (Sec. 1100.200, Ord. 29445, Nov. 5, 2025).
- Who gets the permit
- The county only issues these permits to master plumbers or master water heater replacement specialists who are St. Louis County-licensed, bonded and insured. If you own a detached single-family home and live in it, you (or an immediate family member living there) can get a homeowner permit for one water heater, but you must do all of the work and could be asked to prove you're able to.
- Electric utility
- Ameren Missouri
- Gas utility
- Spire
- Water
- Missouri American Water (St. Louis County system) · Total hardness 82–164 ppm (about 5–10 gpg) from Missouri River plants and 60–150 ppm (about 3.5–9 gpg) from Meramec River plants, per Missouri American Water's 2025 report; which plant serves Oakville is not stated
- Rebate worth checking
- Missouri IRA Home Energy Rebates (HOMES and HEAR) (Not launched)
- Typical home
- Built 1982 (median) · 86% owner-occupied
- Companies found
- 5 that advertise water heater work
01 / TYPICAL PRICES
What a new water heater costs.
Know before you call.
Heat-pump tank
$2,500–$5,000Typical cost, including installation
Tankless
$2,400–$5,400Typical cost, including installation
AI equipment illustrations; models vary and images are not to scale. Typical national prices from Home Depot ↗, checked September 28, 2026. The source doesn’t say how many jobs the ranges are based on. These are not Oakville averages or guaranteed quotes.
Compare what each quote includes.Equipment · Labor · Permits · Old heater removalHow to compare quotes →
What we know about prices in Oakville
- National installer’s published rangeThe ranges above. Home Depot ↗
- Local permit feeOne fee of $47 to replace a home water heater; the separate $47 processing fee doesn't apply (Sec. 1100.200, Ord. 29445, Nov. 5, 2025).. St. Louis County Department of Transportation and Public Works (Code Enforcement) – unincorporated St. Louis County fee source ↗
- Local company’s advertised price1 of the companies listed for Oakville post water heater prices or specials on their websites: Hoffmann Brothers. Each offer has its own conditions.
- Measured local dataNot collected yet, so no Oakville average is shown.
What can change the price in Oakville?
Water heaters bigger than 120 gallons are charged as mechanical units ($47 each if no plan review is needed). Gas lines are covered by the county Mechanical Code instead of the plumbing permit.
02 / COMPANIES WE FOUND
Who replaces water heaters in Oakville?
Companies that advertise water heater replacement here, with what their water heater customers say.
Companies we found in our research. They are not Ember & Tank providers or partners. We show selected reviews, not a rating or every review. How we choose reviews →
Hoffmann Brothers
Lists Oakville among the areas it serves. Based in 3700 Rider Trail S, Suite 100, Earth City, MO 63045 (other St. Louis-area offices: 1643 Tower Grove Ave, St. Louis, MO 63110; 2043 Woodland Pkwy, Suite 100, St Louis, MO 63146; 1254 University Drive, Suite 800, Edwardsville, IL 62025).
- Tank
- Tankless
- Repair
Published price:
What the reviews say
Water heater feedback Customers praised quick replacements (often same or next day), clean installs with floor protection, clear explanations of options, warranties and rebates, and no pushy selling.
Worth knowing A 2026 BBB reviewer said a $927 water heater repair failed, the unit was replaced for about $4,000, and the company credited $450 only after back-and-forth; another reviewer said the company was not the cheapest.
5 water heater reviews read, checked September 30, 2026.
Superior Service
Lists Oakville among the areas it serves. Based in 101 Stag Industrial Blvd., Lake Saint Louis, MO 63367 (second location: 17722 Chesterfield Airport Rd., Chesterfield, MO 63005).
- Tank
- Tankless
- Emergency service
What the reviews say
Water heater feedback Reviewers praised a well-done gas water heater installation and a technician who caught water heater corrosion during routine maintenance.
Worth knowing A 2025 BBB complaint alleged a water heater and drain-pan install that was never tested and later let water leak into a neighbor's unit, and that Superior charged a $100 visit fee and would not correct it; Superior responded that the work was permitted, passed inspection, excluded the existing drain system, and that the overflow came from equipment it never serviced (listed as Answered).
4 water heater reviews read, checked September 30, 2026.
What the reviews say
We haven’t found reviews that mention this company’s water heater work yet.
Faszold Heating, Cooling, Plumbing & Electrical (Faszold Service Co.)
Lists Oakville among the areas it serves. Based in 1613 East Terra Ln, O’Fallon, MO 63366.
- Tank
- Tankless
- Repair
- Emergency service
What the reviews say
We haven’t found reviews that mention this company’s water heater work yet.
Roto-Rooter Plumbing & Water Cleanup (St. Louis)
Lists Oakville among the areas it serves. Based in 2671 Washington Ave, St Louis, MO 63103 (local branch of national company).
- Tank
- Tankless
- Heat pump
- Repair
- Emergency service
What the reviews say
We haven’t found reviews that mention this company’s water heater work yet.
Order: companies based in Oakville first, then companies whose water heater reviews we’ve read. Each group is alphabetical. These businesses are not our employees or vetted partners and do not receive requests from Ember & Tank. We haven’t checked their license, insurance or quality of work. Missouri has no statewide plumbing license (check your city or county) ↗.
FROM COMPANIES SERVING OAKVILLE
Photos of water heater jobs from these companies.
HOMES IN OAKVILLE
What Oakville homes are like.
1982Median year built
44%Built before 1980
86%Owner-occupied
74%Heat with utility gas
84%Single-family homes
The median home was built in 1982. A first or second replacement is common in homes this age.
74% of homes heat with utility gas, so gas water heaters with existing venting are common here.
U.S. Census Bureau, American Community Survey ACS 2024 5-year ↗ (2020-2024). Heating fuel is what homes use to heat the house. It often, but not always, matches the water heater’s fuel.
LOCAL CONDITIONS
What’s different in Oakville.
Expansion tank needed
St. Louis County's plumbing code says each new or replacement water heater must have a listed thermal expansion tank, sized correctly, on the cold water line. It must be within 10 feet of the heater and at least 18 inches from the cold water inlet.
Rules for homeowner permits
One county homeowner permit covers one water heater (or one bathroom or a small fixture job). Only one can be open at a time, and it can expire if work doesn't start or stops for six months.
ENERGY & WATER
Who supplies Oakville homes.
Water
Missouri American Water (St. Louis County system): Total hardness 82–164 ppm (about 5–10 gpg) from Missouri River plants and 60–150 ppm (about 3.5–9 gpg) from Meramec River plants, per Missouri American Water's 2025 report; which plant serves Oakville is not stated
Missouri Public Service Commission – Utility Locator ↗ · Missouri American Water 2025 Water Quality Report, St. Louis County / St. Charles County ↗
REBATES & CREDITS
Rebates for Oakville homes.
For Ameren Missouri and Spire customers in Oakville. Ask installers for the price before rebates, then check with the program that you qualify.
- Missouri IRA Home Energy Rebates (HOMES and HEAR) ↗Not launchedMissouri expects about $76 million for HOMES and $75 million for electrification and appliance rebates.
- Federal Energy Efficient Home Improvement Credit (25C) ↗EndedCovered improvements made through December 31, 2025.
Checked September 30, 2026. Who qualifies and the conditions: Missouri rebates · How to check an incentive.
PERMITS & LICENSING
Permits and licenses in Oakville.
Permits and who issues them
St. Louis County calls a new or replacement water heater (120 gallons or smaller) a No-Plan Plumbing Permit. Oakville owners and plumbers get it on the county's online Permitting Portal, paying there with no plans required and no staff involved, and an inspection follows the install.
Water heater installers in Oakville, whether plumbers or water heater replacement specialists, must hold a St. Louis County license as a master or as a journeyman under a master. Advertising this work without one is not allowed.
St. Louis County Department of Transportation and Public Works (Code Enforcement) – unincorporated St. Louis County ↗ · St. Louis County – No-Plan Plumbing Permits ↗ · St. Louis County Code Ch. 1100, Sec. 1100.200 Plumbing Inspection and Permit Fees (Ord. 29445, Nov. 5, 2025) ↗ · St. Louis County Plumbing Code, Ch. 1103 (UPC with county amendments) ↗
Check the installer’s license
Ask for the license number and search it yourself on the Missouri has no statewide plumbing license (check your city or county) ↗. A listing on Ember & Tank is not a license check. Missouri licensing explained →
NEARBY CITIES
Compare places near Oakville.
| City | Distance | Permit to replace | Fee | Electric |
|---|---|---|---|---|
| Arnold | 3 mi | Required | $50 | Ameren Missouri |
| Mehlville | 4 mi | Required (county) | $47 | Ameren Missouri |
| Lemay | 6 mi | Required (county) | $47 | Ameren Missouri |
| Affton | 7 mi | Required (county) | $47 | Ameren Missouri |
| Crestwood | 8 mi | Required | $47 | Ameren Missouri |
| Webster Groves | 10 mi | Required | — | Ameren Missouri |
COMMON QUESTIONS
Oakville water heater questions.
Who issues water heater permits in Oakville?
Oakville is unincorporated, so St. Louis County Transportation and Public Works issues it online as a No-Plan Plumbing Permit.
How much is the permit?
$47 in total for a home water heater replacement, under Ord. 29445 (November 5, 2025).
Can I replace the water heater myself?
Yes, if you own the detached single-family home and live there. A county homeowner permit can cover one water heater, and you have to do the work. Otherwise, the permit goes to a county-licensed master plumber or master water heater replacement specialist.
More guides: Missouri water heater replacement · All local guides