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, Illinois may require a plumbing-only permit for a water heater, so call the Building & Inspections Division to confirm. The minimum fee is $45, on a schedule from 2010. Both electricity and gas come from Ameren Illinois. The city's Water Division delivers Illinois American Water from the East St. Louis plant to O'Fallon and Fairview Heights.
- Permit to replace with the same type
- Check with the city · City of O'Fallon Community Development Department, Building & Inspections Division
- Permit fee
- Plumbing only: $45 minimum, or 0.004 × value of construction (Building Permit Fee Schedule in effect January 1, 2010, which is old). Reinspections are $50.
- Who gets the permit
- The plumbing permit application asks for the plumbing contractor's license number. The Illinois Plumbing License Law lets an owner-occupant (or renter-occupant) of a single-family home do their own plumbing if it meets the Illinois State Plumbing Code and is inspected. Anyone they hire to help must be a licensed plumber.
- Electric utility
- Ameren Illinois
- Gas utility
- Ameren Illinois
- Water
- City of O'Fallon Public Works Water Division, which buys treated water from Illinois American Water's East St. Louis plant and also serves Fairview Heights (18,000+ customers)
- Rebate worth checking
- Ameren Illinois heat pump water heater incentives (Active)
- Typical home
- Built 1997 (median) · 70% owner-occupied
- Companies found
- 8 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 feePlumbing only: $45 minimum, or 0.004 × value of construction (Building Permit Fee Schedule in effect January 1, 2010, which is old). Reinspections are $50.. City of O'Fallon Community Development Department, Building & Inspections Division fee source ↗
- Local company’s advertised price1 of the companies listed for O'Fallon post water heater prices or specials on their websites: 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?
Electrical-only work needs its own electrical permit ($45 minimum). A home remodel that includes plumbing or electrical has a $75 minimum building permit fee.
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 →
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. IDPH plumber license verification ↗.
FROM COMPANIES SERVING O'FALLON
Photos of water heater jobs from these companies.
HOMES IN O'FALLON
What O'Fallon homes are like.
1997Median year built
26%Built before 1980
70%Owner-occupied
58%Heat with utility gas
75%Single-family homes
The median home was built in 1997. A first or second replacement is common in homes this age.
58% 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.
Occupancy permit when you sell or rent
Before a home without a valid Residential Occupancy Permit is sold or rented, O'Fallon requires one, which means a property maintenance inspection. A water heater that was never permitted or is faulty can turn up then.
O'Fallon FAQs – Community Development, Building & Inspections ↗
Old fee schedule
The posted building permit fees date to January 2010 and the plumbing application to 2014. Check the current fee with the Building & Inspections Division.
ENERGY & WATER
Who supplies O'Fallon homes.
Energy
- Electric: Ameren Illinois
- Gas: Ameren Illinois
O'Fallon – Demolition Permit (PDF; lists Ameren Illinois electric and gas as utility providers) ↗
Water
City of O'Fallon Public Works Water Division, which buys treated water from Illinois American Water's East St. Louis plant and also serves Fairview Heights (18,000+ customers)
O'Fallon – Water Division ↗ · City of O'Fallon 2025 Annual Water Quality Report (PDF) ↗
REBATES & CREDITS
Rebates for O'Fallon homes.
For Ameren Illinois customers in O'Fallon. Ask installers for the price before rebates, then check with the program that you qualify.
- Ameren Illinois heat pump water heater incentives ↗Active$1,150 instant discount when a contractor buys an ENERGY STAR heat pump water heater from a participating distributor, or when you use a Program Ally contractor.
- Illinois IRA Home Energy Rebates (HEAR and HOMES) ↗Not launchedIllinois EPA says its HEAR application has not yet been processed by U.S.
- Federal Energy Efficient Home Improvement Credit (25C) ↗EndedCovered improvements made through December 31, 2025.
Checked September 30, 2026. Who qualifies and the conditions: Illinois rebates · How to check an incentive.
PERMITS & LICENSING
Permits and licenses in O'Fallon.
Permits and who issues them
When a job is only plumbing, O'Fallon issues a separate plumbing permit using its Application for Plumbing Permit. Call the Building & Inspections Division at 618-624-4500 ext. 4 for inspections. The city says plumbing-only work 'may' need a permit and asks residents to call and check. It doesn't name water heaters.
O'Fallon doesn't seem to register plumbers itself. The permit application asks for the plumbing contractor's license number. The State of Illinois licenses plumbers.
City of O'Fallon Community Development Department, Building & Inspections Division ↗ · O'Fallon – Permits for Construction / Work on Buildings ↗ · O'Fallon – Residential Construction / Home Improvement Permit Applications ↗ · O'Fallon FAQ – Remodeling / Home Improvements: when do I need a building permit? ↗ · O'Fallon – Application for Plumbing Permit (PDF, updated Feb. 27, 2014) ↗ · O'Fallon – Building Permit Fee Schedule (effective Jan. 1, 2010, PDF) ↗ · Illinois Plumbing License Law, 225 ILCS 320/3 (owner-occupant exemption) ↗
Check the installer’s license
Ask for the license number and search it yourself on the IDPH plumber license verification ↗. A listing on Ember & Tank is not a license check. Illinois licensing explained →
NEARBY CITIES
Compare places near O'Fallon.
| City | Distance | Permit to replace | Fee | Electric |
|---|---|---|---|---|
| Shiloh | 4 mi | Check with city | — | Ameren Illinois |
| Fairview Heights | 5 mi | Check with city | — | Ameren Illinois |
| Swansea | 5 mi | Required | $0.09 | Ameren Illinois |
| Belleville | 7 mi | Required | — | Ameren Illinois |
| Collinsville | 7 mi | Not required (conditions apply) | $25 | Ameren Illinois, Southwestern Electric Cooperative |
| Troy | 9 mi | Check with city | The building permit fee | Ameren Illinois |
COMMON QUESTIONS
O'Fallon water heater questions.
Do I need a permit to replace a water heater in O'Fallon, IL?
Maybe. The city says plumbing-only work may need its own plumbing permit and asks you to call 618-624-4500 ext. 4 to check. It doesn't name water heaters specifically.
What does a plumbing permit cost?
The posted schedule says plumbing-only permits cost $45 or 0.4% of the job value, whichever is more. That schedule took effect January 1, 2010.
Can I install my own water heater?
You can if it's your own single-family home and you live there. Illinois law allows it if the work meets the state plumbing code and passes inspection. If someone helps you, they have to be a licensed plumber.
More guides: Illinois water heater replacement · All local guides