Storage tank
$1,600–$2,400Typical cost, including installation
WATER HEATER REPLACEMENT IN O'FALLON
O'Fallon Water Heater
Replacement
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See what replacement costs ↓O'FALLON AT A GLANCE
Replacing a water heater in O'Fallon.
O'Fallon's Building Division charges 0.65% of the job cost for a water heater permit, with a $50 minimum. You apply and book the inspection on the CitizenServe portal. Water comes from the city's own wells, treated by reverse osmosis, or from Missouri American Water or PWSD 2, depending on your neighborhood. Electricity comes from Ameren Missouri or Cuivre River Electric, and gas from Spire.
- Permit to replace with the same type
- Yes · City of O'Fallon Building Division
- Permit fee
- Construction cost × 0.0065, with a $50 minimum for a water heater (city permit fee schedule; no effective date printed).
- Electric utility
- Ameren Missouri and Cuivre River Electric Cooperative
- Gas utility
- Spire
- Water
- City of O'Fallon Water and Sewer for about 13,315 customers; other parts of the city get water from Missouri American Water or St. Charles County Public Water Supply District No. 2 · City system: carbonate hardness 123–283 mg/L (7–17 gpg) from 2023 samples, printed in the 2025 report; the city softens with a reverse-osmosis/membrane plant. PWSD 2: 142–184 mg/L (2023 samples, 2025 report). Missouri American: 60–164 ppm total hardness (2025 report).
- Rebate worth checking
- Heat Pump Water Heater rebate (Active)
- Typical home
- Built 2000 (median) · 81% owner-occupied
- Companies found
- 9 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 O'Fallon averages or guaranteed quotes.
Compare what each quote includes.Equipment · Labor · Permits · Old heater removalHow to compare quotes →
What we know about prices in O'Fallon
- National installer’s published rangeThe ranges above. Home Depot ↗
- Local permit feeConstruction cost × 0.0065, with a $50 minimum for a water heater (city permit fee schedule; no effective date printed).. City of O'Fallon Building Division fee source ↗
- Local company’s advertised price2 of the companies listed for O'Fallon post water heater prices or specials on their websites: Arch Plumbing, Hoffmann Brothers. Each offer has its own conditions.
- Measured local dataNot collected yet, so no O'Fallon average is shown.
What can change the price in O'Fallon?
The fee schedule lists general Plumbing, Electric and Mechanical permits separately (each with a $75 minimum), so extra gas or electrical work may be charged as its own permit.
02 / COMPANIES WE FOUND
Who replaces water heaters in O'Fallon?
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 →
Arch Plumbing
Lists O'Fallon among the areas it serves. Based in Lake St. Louis, MO area (site says 'Based near Lake St. Louis'; no street address shown).
- Tank
- Tankless
- Heat pump
- Repair
- Emergency service
Published price:
What the reviews say
Water heater feedback Customers praised quick scheduling for water heater replacements, including same-day and next-morning installs, and prompt, professional technicians.
Worth knowing No water heater complaints found in the sources checked.
4 water heater reviews read, checked September 30, 2026.
Beis Plumbing
Lists O'Fallon among the areas it serves. Based in 280 Vance Rd, Valley Park, MO 63088.
- Tank
- Tankless
- Repair
- Emergency service
What the reviews say
Water heater feedback Customers praised same-day water heater replacements, code updates explained clearly, careful cleanup and responsive office staff.
Worth knowing Reviewers alleged problems after water heater installs, including ceiling water damage from a misrouted line that the company would not repair, an incorrect installation that caused corrosion and leaking, and dismissive service-manager follow-up; no company responses were visible on these reviews.
6 water heater reviews read, checked September 30, 2026.
Hoffmann Brothers
Lists O'Fallon 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.
Linek Plumbing Company
Lists O'Fallon among the areas it serves. Based in 24 Kirkham Industrial Ct, Webster Groves, MO 63119.
- Tank
- Tankless
- Repair
- Emergency service
What the reviews say
Water heater feedback Testimonials praised careful floor protection and cleanup, clear communication, and the office finding a same-day crew after a scheduling mix-up.
Worth knowing No water heater complaints found in the sources checked.
4 water heater reviews read, checked September 30, 2026.
Performance Plumbing
Lists O'Fallon among the areas it serves. Based in 1104 S Callahan Rd, Wentzville, MO 63385.
- Tank
- Tankless
- Heat pump
- Repair
What the reviews say
Water heater feedback Customers praised on-time, tidy water heater replacements at a fair price, clear explanations, and no-pressure estimates.
Worth knowing No water heater complaints found in the sources checked.
4 water heater reviews read, checked September 30, 2026.
Superior Service
Lists O'Fallon 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.
Darwyn's Plumbing, Inc.
Lists O'Fallon among the areas it serves. Based in 2702 Camp Jackson Rd, Cahokia, IL 62206.
- Tank
- Tankless
- Repair
- Emergency service
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 O'Fallon 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 O'Fallon 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 O'Fallon 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 O'FALLON
Photos of water heater jobs from these companies.
HOMES IN O'FALLON
What O'Fallon homes are like.
2000Median year built
9%Built before 1980
81%Owner-occupied
71%Heat with utility gas
84%Single-family homes
The median home was built in 2000. A first or second replacement is common in homes this age.
71% 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 O'Fallon.
Three water systems in one city
The city runs its own wells and a 6 million gallon per day reverse osmosis (membrane) treatment plant, but it also buys water from Missouri American Water and PWSD 2, and those providers serve other parts of O'Fallon. Check your water bill to see which report applies to you before choosing a softener or expansion tank size.
O'Fallon – O'Fallon's Water System ↗ · O'Fallon – Helpful Phone Numbers (public utilities) ↗
Next-day inspections
Inspections booked on the CitizenServe portal are usually done the next day.
ENERGY & WATER
Who supplies O'Fallon homes.
Energy
- Electric: Ameren Missouri (Ameren isn't on the city's phone list; we couldn't confirm on an official page that it serves O'Fallon)
- Electric: Cuivre River Electric Cooperative (Listed among O'Fallon's public utilities; serves part of the area)
- Gas: Spire
Water
City of O'Fallon Water and Sewer for about 13,315 customers; other parts of the city get water from Missouri American Water or St. Charles County Public Water Supply District No. 2: City system: carbonate hardness 123–283 mg/L (7–17 gpg) from 2023 samples, printed in the 2025 report; the city softens with a reverse-osmosis/membrane plant. PWSD 2: 142–184 mg/L (2023 samples, 2025 report). Missouri American: 60–164 ppm total hardness (2025 report).
O'Fallon – O'Fallon's Water System ↗ · O'Fallon PWS 2025 Annual Water Quality Report (MoDNR, PWS MO6010588) ↗ · St. Charles County PWSD 2 2025 Annual Water Quality Report (MoDNR, PWS MO6024530) ↗ · Missouri American Water 2025 Water Quality Report, St. Louis County / St. Charles County (PWS MO6010716) ↗
REBATES & CREDITS
Rebates for O'Fallon homes.
For Ameren Missouri, Cuivre River Electric Cooperative and Spire customers in O'Fallon. Ask installers for the price before rebates, then check with the program that you qualify.
- Heat Pump Water Heater rebate ↗ActiveOnly for Cuivre River members: 50% of the total cost, up to $750, for a heat pump water heater of 40 gallons or more.
- 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 O'Fallon.
Permits and who issues them
O'Fallon says repairs to electrical, mechanical and plumbing systems need a permit, and its fee schedule lists a separate Water Heater permit. Apply and pay on the city's CitizenServe portal, then schedule the inspection there. Inspections booked on the portal are usually done the next day.
City of O'Fallon Building Division ↗ · O'Fallon – Building and Permits ↗ · City of O'Fallon Permit Fee Schedule (PDF, linked from Building and Permits) ↗
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 O'Fallon.
| City | Distance | Permit to replace | Fee | Electric |
|---|---|---|---|---|
| Dardenne Prairie | 3 mi | Check with city | — | Ameren Missouri, Cuivre River Electric Cooperative |
| Lake St. Louis | 4 mi | Required | $50 | Cuivre River Electric Cooperative |
| St. Peters | 6 mi | Required | By job value (from $25) | Ameren Missouri, Cuivre River Electric Cooperative |
| Wentzville | 8 mi | Check with city | $35, | Ameren Missouri |
| St. Charles | 11 mi | Required | $50 | Ameren Missouri |
| Chesterfield | 12 mi | Required | $47 | Ameren Missouri |
COMMON QUESTIONS
O'Fallon water heater questions.
How much is a water heater permit in O'Fallon?
The city's fee schedule sets the permit at 0.65% of the construction cost, with a $50 minimum for a water heater. The schedule doesn't show an effective date.
City of O'Fallon Permit Fee Schedule (PDF, linked from Building and Permits) ↗
Does Cuivre River Electric offer a water heater rebate?
Yes. Members can get 50% of the cost, up to $750, for a heat pump water heater of 40 gallons or more. Tankless and gas units don't qualify.
How hard is O'Fallon's water?
It depends on your provider. The city's 2025 report lists carbonate hardness of 123–283 mg/L from 2023 samples. PWSD 2 lists 142–184 mg/L, and Missouri American lists 60–164 ppm.
O'Fallon PWS 2025 Annual Water Quality Report (MoDNR, PWS MO6010588) ↗ · St. Charles County PWSD 2 2025 Annual Water Quality Report (MoDNR, PWS MO6024530) ↗ · Missouri American Water 2025 Water Quality Report, St. Louis County / St. Charles County (PWS MO6010716) ↗
More guides: Missouri water heater replacement · All local guides