Storage tank
$1,600–$2,400Typical cost, including installation
WATER HEATER REPLACEMENT IN MEHLVILLE
Mehlville Water Heater
Replacement
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See what replacement costs ↓MEHLVILLE AT A GLANCE
Replacing a water heater in Mehlville.
Mehlville is unincorporated south St. Louis County, so you get a water heater permit from the county online: a no-plan plumbing permit for $47. Every replacement needs an expansion tank, and the county licenses both master plumbers and installers who only replace water heaters. In Mehlville, Ameren Missouri provides power, Spire provides gas and Missouri American Water provides water.
Mehlville 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
- $47 covers a home water heater replacement in full; the county drops its usual $47 processing fee for these (Sec. 1100.200, Ord. 29445, adopted Nov. 5, 2025).
- Who gets the permit
- To get the county's water heater replacement permit, you need to be a master plumber or master water heater replacement specialist licensed by St. Louis County, with bond and insurance. Homeowners are the exception: if you own and live in a detached single-family house (or are immediate family living there), you can get a homeowner permit for one water heater, do all the work yourself, and possibly be asked to show you know how.
- 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; the report says the water is lime-softened; exact plant for Mehlville not stated
- Rebate worth checking
- Missouri IRA Home Energy Rebates (HOMES and HEAR) (Not launched)
- Typical home
- Built 1969 (median) · 66% owner-occupied
- Companies found
- 3 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 Mehlville averages or guaranteed quotes.
Compare what each quote includes.Equipment · Labor · Permits · Old heater removalHow to compare quotes →
What we know about prices in Mehlville
- National installer’s published rangeThe ranges above. Home Depot ↗
- Local permit fee$47 covers a home water heater replacement in full; the county drops its usual $47 processing fee for these (Sec. 1100.200, Ord. 29445, adopted 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 Mehlville post water heater prices or specials on their websites: Hoffmann Brothers. Each offer has its own conditions.
- Measured local dataNot collected yet, so no Mehlville average is shown.
What can change the price in Mehlville?
Heaters over 120 gallons (or over 40 kW or 140,000 BTU) aren't covered by the home replacement rules; they're charged as mechanical permits. Gas piping follows the county Mechanical/Fuel Gas Code, and a new circuit needs a county electrical permit.
02 / COMPANIES WE FOUND
Who replaces water heaters in Mehlville?
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 Mehlville 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 Mehlville 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.
Roto-Rooter Plumbing & Water Cleanup (St. Louis)
Lists Mehlville 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 Mehlville 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) ↗.
See before-and-after replacement examples from independent companies →
HOMES IN MEHLVILLE
What Mehlville homes are like.
1969Median year built
71%Built before 1980
66%Owner-occupied
60%Heat with utility gas
64%Single-family homes
About 71% of homes were built before 1980. Older homes often have older venting, smaller closets and shutoff valves that should be checked before install day.
60% 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 Mehlville.
Expansion tank required
The county changes the 2015 UPC so that every new or replacement water heater needs a correctly sized thermal expansion tank on the cold water line, within 10 feet of the heater and at least 18 inches from the inlet. The house water pressure and the tank's pre-charge must be written on a label on the tank. The shutoff valve must be within 10 feet of the heater and reachable from the floor.
St. Louis County Plumbing Code, Ch. 1103 (2015 UPC with county amendments) ↗
What a homeowner permit covers
A county homeowner permit is limited to one bathroom, one water heater, or a few small fixtures (up to 8 drainage fixture units). You can have only one homeowner permit open at a time, and it expires if work doesn't start or has no inspections for six months.
St. Louis County Plumbing Code, Ch. 1103 (2015 UPC with county amendments) ↗
ENERGY & WATER
Who supplies Mehlville homes.
Energy
- Electric: Ameren Missouri (Ameren Missouri serves the St. Louis area; we didn't check a service map for each address)
- Gas: Spire (Spire's Eastern Missouri area; we didn't check a service map for each address)
Ameren – service territory overview ↗ · Spire – About Spire (Eastern Missouri service area) ↗
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; the report says the water is lime-softened; exact plant for Mehlville not stated
REBATES & CREDITS
Rebates for Mehlville homes.
For Ameren Missouri and Spire customers in Mehlville. 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 Mehlville.
Permits and who issues them
Mehlville homes fall under St. Louis County, which issues a No-Plan Plumbing Permit for any new or replacement water heater of up to 120 gallons. Buy it online through the county's Accela Permitting Portal; you don't need plans or a call to the office. Once the heater is in, the county inspects it.
Installers of water heaters need a St. Louis County plumber or water heater replacement specialist license (master or journeyman). Companies can't advertise water heater replacement unless an owner or employee is licensed.
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 (2015 UPC with county amendments) ↗ · St. Louis County – Municipality Contract Matrix (code enforcement by county, PDF) ↗
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 Mehlville.
| City | Distance | Permit to replace | Fee | Electric |
|---|---|---|---|---|
| Lemay | 3 mi | Required (county) | $47 | Ameren Missouri |
| Affton | 3 mi | Required (county) | $47 | Ameren Missouri |
| Oakville | 4 mi | Required (county) | $47 | Ameren Missouri |
| Crestwood | 5 mi | Required | $47 | Ameren Missouri |
| Arnold | 6 mi | Required | $50 | Ameren Missouri |
| Webster Groves | 6 mi | Required | — | Ameren Missouri |
This guide also covers Concord, which share Mehlville’s permit office, utilities, water provider and companies.
COMMON QUESTIONS
Mehlville water heater questions.
Who issues water heater permits in Mehlville?
Mehlville is unincorporated, so St. Louis County Transportation and Public Works issues the permit online on its Accela portal as a No-Plan Plumbing Permit.
St. Louis County – No-Plan Plumbing Permits ↗ · St. Louis County – Municipality Contract Matrix (code enforcement by county, PDF) ↗
How much does the county charge for a water heater permit?
$47 total to replace a home water heater under Ord. 29445 (November 5, 2025). The separate $47 processing fee isn't charged.
Can I install the water heater myself?
Yes, if it is your own detached single-family home and you live there. A county homeowner permit can cover one water heater, but you must do the work yourself. Otherwise a county-licensed master plumber or master water heater replacement specialist must get the permit.
St. Louis County Plumbing Code, Ch. 1103 (2015 UPC with county amendments) ↗
More guides: Missouri water heater replacement · All local guides