Answer up front

Published third-party data puts boiler in the 4,000–9,000 dollar range nationally — The headline figures are for replacing a gas boiler, the most common version of this job, and radiant floor work or a fuel conversion is priced separately. Every contractor prices independently, so treat that as a sanity check on a quote rather than a quote itself.

Cost ranges reported by third parties — reported ranges for boiler in Colorado

Reported cost ranges, 2026. Ranges are published third-party figures, not quotes.
JobReported rangeWhat pushes it higher
Gas boiler replacement$4,000–$9,000Output sizing, venting changes and reworking the near-boiler piping to suit.
Oil boiler replacement$4,800–$9,000Burner setup, tank and line condition, and flue work on older chimneys.
Electric boiler replacement$1,800–$8,000Panel capacity and the circuit needed for the output the property requires.
Conventional system, unit and fitting$2,200–$7,000Whether the cylinder and controls are retained, and the state of existing pipework.
Combination boiler$2,600–$7,000Hot water flow rate demanded, gas supply sizing and condensate drainage routes.
High-efficiency condensing boiler$6,000–$11,000Modulating controls, low-temperature emitters and a condensate route to a drain.
Repair rather than replacement$200–$600Circulator pumps and controls are modest; a failed heat exchanger is not.

Not a quote. These are third-party reported ranges, sourced from Angi, "How Much Does Boiler Installation and Replacement Cost? [2026 Data]", angi.com/articles/how-much-does-boiler-installation-cost.htm, fetched 2026-08-11. Only a licensed contractor who has seen the job can price it.

What moves the number — the 5 factors that change the number

Pricing is set independently by each contractor, so this page lists what moves the number rather than a figure.

  1. 01

    Boiler type and fuel — gas, oil or electric

  2. 02

    Whether it is a control, circulator, expansion tank or heat exchanger failure

  3. 03

    Age of the unit and parts availability

  4. 04

    Whether venting or near-boiler piping must be brought up to code

  5. 05

    Zone count and whether zone valves or a manifold are involved

Symptoms and triggers — is boiler service actually the fix?

Paying for the wrong job is the most expensive mistake here. These are the signs that point to boiler rather than something else.

  • No heat or uneven heat between rooms
  • Boiler pressure reading outside the normal band
  • Banging, knocking or whistling in pipes or radiators
  • Visible leak at the boiler or a radiator valve
  • The boiler locks out and needs repeated resetting

What the work involves — so a quote can be read line by line

  1. Pressure, temperature and the expansion tank are checked
  2. The system is bled and circulator operation verified
  3. Controls, aquastat and safety devices are tested
  4. The failed component is replaced, or replacement is quoted for an end-of-life unit
  5. The system is balanced and cycled under load

Boiler cost by city in Colorado

Labour rates, permit fees and travel distance all differ across Colorado, which is why the same job is not the same number in every market.

Colorado markets with a dedicated boiler page
CityCountyPermit authority
Boiler in Denver Denver CountyDenver Community Planning & Development
Boiler in Colorado Springs El Paso CountyPikes Peak Regional Building Department (city and El Paso County)
Boiler in Aurora Arapahoe CountyAurora Building Division
Boiler in Fort Collins Larimer CountyFort Collins Building Services
Boiler in Lakewood Denver CountyLakewood Building Division
Boiler in Westminster Adams CountySet locally
Boiler in Arvada Jefferson CountySet locally
Boiler in Centennial Arapahoe CountySet locally
Boiler in Boulder Boulder CountySet locally
Boiler in Longmont Boulder CountySet locally
Boiler in Parker Douglas CountySet locally
Boiler in Littleton Arapahoe CountySet locally
Boiler in Louisville Boulder CountySet locally

Before anyone touches a pipe

Verify the licence. It takes two minutes.

  • Who licenses the work: State Plumbing Board, Colorado Division of Professions and Occupations (DORA) together with the local jurisdiction.
  • Who pulls the permit: the licensed contractor, never the homeowner.
  • What to ask for: the licence number, the registered name behind it, and an insurance certificate issued to the property address.
Check a licence numberColorado State Plumbing Board Colorado licensing in full
Chrome faucet with running water
Independent licensed professionals

How to avoid overpaying for boiler

  • Get the scope in writing before the number: what is being replaced, what is being repaired, what is being left alone.
  • Ask whether the price is flat-rate or time-and-materials, and what the diagnostic charge covers.
  • Ask whether the permit and inspection fee is inside or outside the figure.
  • Ask what happens if the job opens up and turns out to be larger — get the change-order rule up front.
  • Confirm the warranty term on parts and on labour separately.
  • Verify the licence number on the Colorado State Plumbing Board register before any work starts.

Answers first

Frequently asked — boiler cost in Colorado

Why do my radiators knock?

Knocking usually means trapped air, water hammer from a stuck valve, or in steam systems a pitch problem letting condensate collect. Bleeding is the first step; persistent knocking is a diagnostic visit.

What boiler pressure is normal?

Most residential hydronic systems sit in a low static band when cold and rise modestly when hot — check the manufacturer's plate for your unit. Pressure that keeps climbing usually points to a failed expansion tank or a leaking fill valve.

Is a boiler covered by a plumber or an HVAC contractor?

It varies by state and by the credential involved. Hydronic and steam boilers are commonly plumbing-licensed work; forced-air is HVAC. Confirm the contractor holds the right credential for boiler work in your state.

Which areas does PlumberColorado cover?

All of Colorado: the site lists every covered city with real ZIP codes, the county permit authority and nearby coverage, so requests route to a professional already working that area.

Is PlumberColorado a plumbing company?

No. Independent licensed professionals perform and contract the work directly with you. PlumberColorado routes the request and links every page to the official Colorado licence register.

Does PlumberColorado charge homeowners anything?

No. PlumberColorado may be compensated by a partner when a homeowner connects with a professional through the site. That never changes what the contractor charges for the job.

Does calling create any obligation to hire?

None. A call or a callback request is a conversation, not a contract. Scope, timing and price are only agreed if you decide to proceed with the professional handling Colorado.

Are night and weekend calls handled differently in Colorado?

Requests route around the clock, but most contractors price after-hours work differently. Ask for the after-hours rate and a committed arrival window before agreeing to a dispatch.

Get connected

Boiler in Colorado

The form takes half a minute. It routes to an independent licensed pro covering Colorado; everything else — scope, timing, price — you agree with them directly, licence verified first.

  • Requests handled around the clock
  • An independent licensed pro calls you back
  • No obligation to hire

Prefer a call back?

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Records for this request are provided electronically; a paper copy is free on request and the agreement can be withdrawn at any time — electronic records notice.

Submitting without the box still sends the request. PlumberColorado is a referral service, not a plumbing contractor. Stop contact any time