Storage tank
$1,600–$2,400Typical cost, including installation
WATER HEATER REPLACEMENT IN THORNTON
Thornton Water Heater
Replacement
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See what replacement costs ↓THORNTON AT A GLANCE
Replacing a water heater in Thornton.
Thornton requires a permit to replace a water heater, but a same-type replacement needs no plan review. If you're working on your own primary home, you don't need a contractor license. The fee depends on job value under the 2026 schedule, starting at $30. Thornton Water's 2025 average hardness was about 230 mg/L (13.5 gpg). Electricity comes from Xcel Energy or United Power, depending on your address.
- Permit to replace with the same type
- Yes · City of Thornton City Development – Building Division
- Permit fee
- Based on job value. The 2026 schedule sets mechanical, electrical and plumbing permit fees at $30 for $0–$1,000, plus $10 for each extra $1,000. City use tax is 3.75% of 50% of the job value (or 100% of the materials cost).
- Who gets the permit
- Homeowners working on their own primary home aren't treated as contractors and don't need a contractor license. Any contractor you hire must be licensed with the city before the permit is issued.
- Electric utility
- Xcel Energy and United Power
- Gas utility
- Xcel Energy
- Water
- City of Thornton (Thornton Water) · Averaged about 230 mg/L (13.5 gpg) in 2025, ranging 152–356 mg/L by season and location; treatment plants do not remove hardness (2026 Water Quality Report)
- Rebate worth checking
- United Power electric water heater rebates (Active)
- Typical home
- Built 1997 (median) · 71% owner-occupied
- Companies found
- 10 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 Thornton averages or guaranteed quotes.
Compare what each quote includes.Equipment · Labor · Permits · Old heater removalHow to compare quotes →
What we know about prices in Thornton
- National installer’s published rangeThe ranges above. Home Depot ↗
- Local permit feeBased on job value. The 2026 schedule sets mechanical, electrical and plumbing permit fees at $30 for $0–$1,000, plus $10 for each extra $1,000. City use tax is 3.75% of 50% of the job value (or 100% of the materials cost).. City of Thornton City Development – Building Division fee source ↗
- Local company’s advertised price8 of the companies listed for Thornton post water heater prices or specials on their websites: Applewood Plumbing Heating & Electric, Bell Plumbing, Heating, Cooling & Electrical, Brothers Plumbing, Heating and Electric, Hot Water Now!, Mr. Rooter Plumbing of Northern Colorado, Plumb Pros Inc., Plumbline Services, Canyon Plumbing & Heating, Inc.. Each offer has its own conditions.
- Measured local dataNot collected yet, so no Thornton average is shown.
02 / COMPANIES WE FOUND
Who replaces water heaters in Thornton?
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 →
Applewood Plumbing Heating & Electric
Lists Thornton among the areas it serves. Based in Denver, CO.
- Tank
- Tankless
- Heat pump
- Repair
Published price: Coupon: "$50 OFF Any Plumbing Service" — covers items including "Water Heater Tune Up and Flush" (Limit one coupon per transaction; Valid through September 30, 2026). No water heater replacement price published —
What the reviews say
Water heater feedback A reviewer praised next-morning water heater replacement.
Worth knowing A water heater customer disputed the installation price and warranty choices.
2 water heater reviews read, checked September 29, 2026.
Bell Plumbing, Heating, Cooling & Electrical
Lists Thornton among the areas it serves.
- Tank
- Tankless
- Heat pump
- Repair
- Emergency service
Published price: Coupon: "$125 Off A Tank or Tankless Water Heater" (Expires 10/31/26; not valid with any other offer) — Water heater installation page advertises "FREE estimates for water heater installations throughout Denver" —
What the reviews say
Water heater feedback A BBB reviewer said Bell fixed complications with a new water heater installation, apologized and discounted the fee.
Worth knowing One BBB complainant said a boiler fired without water after a side-arm water heater replacement.
4 water heater reviews read, checked September 29, 2026.
Blue Sky Plumbing, Heating, Cooling & Electrical
Lists Thornton among the areas it serves.
- Tank
- Tankless
- Repair
- Emergency service
What the reviews say
Water heater feedback A reviewer said Blue Sky made them feel they got full value on a boiler and water heater replacement, and a BBB complainant said a follow-up visit fixed their installation problems.
Worth knowing One BBB complainant said Blue Sky charged for a warranty replacement water tank; Blue Sky said an internal policy change caused confusion, issued a $2,977.52 credit and the customer accepted.
3 water heater reviews read, checked September 29, 2026.
bluefrog Plumbing + Drain of Denver
Lists Thornton among the areas it serves. Based in Centennial, CO.
- Tank
- Tankless
- Repair
- Emergency service
What the reviews say
Water heater feedback A reviewer praised a technician who replaced an old water heater with a tankless unit and repaired a drain, calling the price reasonable for the work.
Worth knowing No water heater complaints found in the sources checked.
1 water heater review read, checked September 29, 2026.
Brothers Plumbing, Heating and Electric
Lists Thornton among the areas it serves.
- Tank
- Tankless
- Repair
Published price: Coupon: "$150.00 Off Water Heater Installation" (also a general "$50 Off Work Performed*" offer) — and
What the reviews say
Water heater feedback One customer praised fast scheduling and communication after their water heater failed.
Worth knowing Another customer reported recurring water heater faults and poor follow-up.
2 water heater reviews read, checked September 29, 2026.
Hot Water Now!
Lists Thornton among the areas it serves. Based in Lakewood, CO.
- Tank
- Tankless
- Heat pump
- Repair
- Emergency service
Published price: Homepage coupons: "MILITARY 5% DISCOUNT", "FIRST RESPONDERS 5% DISCOUNT", "TEACHERS 5% DISCOUNT". No water heater price published —
What the reviews say
Water heater feedback One reviewer praised tankless water heater exhaust-piping work and cleanup.
Worth knowing Too little water heater replacement feedback to assess installation pricing or outcomes.
1 water heater review read, checked September 29, 2026.
Mr. Rooter Plumbing of Northern Colorado
Lists Thornton among the areas it serves.
- Tank
- Tankless
- Heat pump
- Repair
- Emergency service
Published price: Special offers: "$200 Off Water Heater Special" and "$500 Off Tankless Water Heater Installation" (Expires: 09/30/2026) — Installation page FAQ states homeowners "tend to pay an expected sum of $500 to $3,000 for the complete installation, including the price of the water heater itself" —
What the reviews say
Water heater feedback Customers quoted on the company's site praised weekend water heater replacements with added code or safety improvements, and help with tankless units.
Worth knowing No water heater complaints found in the sources checked; one company-hosted review mentions a supplier-damaged unit delaying a replacement, which the reviewer did not attribute to the plumber.
4 water heater reviews read, checked September 29, 2026.
Plumb Pros Inc.
Lists Thornton among the areas it serves. Based in Arvada, CO.
- Tank
- Tankless
- Repair
- Emergency service
Published price: Coupon: "10% OFF Off New Water Heater, Furnace, or Air Conditioner (Up to $500)" (Expires 10/31/26; offers may not be combined) — Its Denver water heater cost article publishes typical ranges, e.g. replacement "$900–$2,500 installed, depending on unit size and type" and repairs typically "$150 and $950"; after-hours/same-day emergency calls "typically an additional $75–$150 service fee" —
What the reviews say
Water heater feedback BBB reviewers praised clear explanations of tank and tankless options, polite crews and clean installations.
Worth knowing A BBB complainant said their home-improvement credit card was charged the full credit line instead of the contract amount after a water heater install.
4 water heater reviews read, checked September 29, 2026.
Plumbline Services
Lists Thornton among the areas it serves.
- Tank
- Emergency service
Published price: Coupon: "$250 Off a Water Heater Installation" (promo code 250-waterheater, expires 12/29/2026; existing residential only) — Water heater page also states a "$49 service fee (we waive the service charge if you choose us to repair the issue)" and that in-home estimates are free —
What the reviews say
Water heater feedback BBB reviewers praised replacements of old water heaters, clear explanations of options and code-related parts, and quotes that held without add-ons.
Worth knowing In a September 2026 BBB review, a customer said a water heater installed August 21, 2026 needed four return visits for the same loss of hot water; no business reply was shown.
4 water heater reviews read, checked September 29, 2026.
Canyon Plumbing & Heating, Inc.
Lists Thornton among the areas it serves. Based in Boulder, CO.
- Tank
- Tankless
- Repair
- Emergency service
Published price: Coupons: "$150 OFF Water Heater Installation or Replacement" and "$250 OFF Tankless Water Heater Installation or Replacement" (also "$50 Any Service") —
What the reviews say
We haven’t found reviews that mention this company’s water heater work yet.
Order: companies based in Thornton 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. Colorado DORA license lookup ↗.
FROM COMPANIES SERVING THORNTON
Photos of water heater jobs from these companies.
HOMES IN THORNTON
What Thornton homes are like.
1997Median year built
22%Built before 1980
71%Owner-occupied
70%Heat with utility gas
73%Single-family homes
The median home was built in 1997. A first or second replacement is common in homes this age.
70% 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 Thornton.
Hard water
Thornton's 2026 water quality report puts 2025 average hardness at about 230 mg/L (13.5 gpg) and says its plants don't remove hardness. The city suggests softeners or RO systems, and its Water Quality Laboratory can tell you the hardness at your location.
Two electric companies
Some parts of Thornton get electricity from United Power and others from Xcel Energy, so your rebates depend on which one serves your address.
ENERGY & WATER
Who supplies Thornton homes.
Energy
- Electric: Xcel Energy (Depends on location)
- Electric: United Power (Depends on location; see the city's Utility Service Areas Map)
- Gas: Xcel Energy (The city lists Xcel or United Power for 'electric and gas' depending on location)
Water
City of Thornton (Thornton Water): Averaged about 230 mg/L (13.5 gpg) in 2025, ranging 152–356 mg/L by season and location; treatment plants do not remove hardness (2026 Water Quality Report)
REBATES & CREDITS
Rebates for Thornton homes.
For Xcel Energy and United Power customers in Thornton. Ask installers for the price before rebates, then check with the program that you qualify.
- United Power electric water heater rebates ↗ActiveUnited Power members can get this; Xcel customers can't.
- Xcel Energy heat pump water heater rebate ↗Active$750 for an Xcel customer who installs a qualifying heat pump water heater.
- Colorado heat pump tax credit ↗Active for 2026 installs$250 credit for an ENERGY STAR heat pump water heater installed in 2026, claimed by a state-registered contractor, who must pass at least $83 to you as an invoice discount.
- Federal Energy Efficient Home Improvement Credit (25C) ↗EndedCovered improvements made through December 31, 2025.
Checked September 29, 2026. Who qualifies and the conditions: Colorado rebates · How to check an incentive.
PERMITS & LICENSING
Permits and licenses in Thornton.
Permits and who issues them
Thornton requires a permit to install or replace a water heater. A same-type replacement is a 'homeowner project' issued without plan review. Send questions to buildings@thorntonco.gov or call 303-538-7250.
Yes. Thornton requires every contractor to be licensed before a permit is issued. 2026 license fees run from $75 (Class D Specialty) to $200 (Class A).
City of Thornton City Development – Building Division ↗ · Thornton Homeowner Projects – No Review Needed (updated 2/20/2026) ↗ · Thornton Projects That Require a Building Permit (updated 10/31/2025) ↗ · Thornton 2026 Building Permit Fee Schedule ↗ · Thornton Contractor Information ↗
Check the installer’s license
Ask for the license number and search it yourself on the Colorado DORA license lookup ↗. A listing on Ember & Tank is not a license check. Colorado licensing explained →
NEARBY CITIES
Compare places near Thornton.
| City | Distance | Permit to replace | Fee | Electric |
|---|---|---|---|---|
| Northglenn | 2 mi | Required | By job value (from $23.50) | Xcel Energy |
| Federal Heights | 5 mi | Required | By job value (from $23.50) | Xcel Energy |
| Welby | 6 mi | Required (county) | By job value (from $24) | Xcel Energy |
| Broomfield | 6 mi | Required | By job value (from $23.50) | United Power, Xcel Energy |
| Sherrelwood | 7 mi | Required (county) | By job value (from $24) | Xcel Energy |
| Westminster | 7 mi | Required | $40 | Xcel Energy |
COMMON QUESTIONS
Thornton water heater questions.
Is a water heater permit in Thornton quick to get?
A same-type replacement is on the city's list of homeowner projects issued without plan review.
How hard is Thornton's water?
About 230 mg/L (13.5 grains per gallon) on average in 2025, ranging from 152 to 356 mg/L. The city's plants don't remove hardness.
Who provides electricity in Thornton?
Xcel Energy or United Power, depending on where you live. Check your bill or the city's Utility Service Areas Map.
More guides: Colorado water heater replacement · All local guides