Water Heater Repair, Installation and Replacement in Longmont, CO
Longmont water heater repair, installation and replacement, with the City permit pulled and Efficiency Works rebates checked.
- Honest repair-or-replace advice
- Written, itemized quotes
- Licensed and insured
Photo: David Shankbone, CC BY 3.0, via Wikimedia Commons
Fort Collins Water Heater Pros repairs, installs and replaces gas, electric, tankless and heat pump water heaters in Longmont, CO. Our licensed plumbers give you a written, itemized quote before work starts and pull the City of Longmont permit on every replacement. Longmont homes also start with two advantages: soft water and Efficiency Works rebates through Longmont Power & Communications.
Call (970) 305-5633 to book water heater repair or an installation quote in Longmont.
Call nowWater heater services in Longmont
Pick the row that matches what your heater is doing:
| If your water heater | Start here |
|---|---|
| Leaks from the tank or is near the end of its life | Water heater replacement in Longmont |
| Won’t heat, won’t stay lit or trips its breaker | Water heater repair in Longmont |
| Needs a new location, a fuel change or a first install | Water heater installation in Longmont |
| Is due for a switch to tankless | Tankless water heater installation in Longmont |
| Is electric and costly to run | Heat pump water heaters in Longmont |
| Is leaking onto the floor right now | Emergency water heater repair in Longmont |
How hard is Longmont’s water?
It isn’t: Longmont’s water is soft. The City’s 2025 Drinking Water Quality Report measured total hardness of 19 to 25 mg/L, averaging 21.7 mg/L, which the City calls 1 to 2 grains per gallon, and it does not recommend a water softener. That year 62% of the supply came from the upper Colorado River, stored in Carter Lake, and 38% from the St. Vrain Creek watershed.
Low hardness means less scale. Rinnai allows up to 200 mg/L in its condensing tankless models, more than nine times Longmont’s average, and A.O. Smith says a softener makes a tank’s anode rod wear out faster. Sediment can still settle and anode rods are still consumed, so periodic flushing and anode checks matter here too; see how to flush a water heater.
Heat pump water heater rebates in Longmont
Longmont Power & Communications supplies the city’s electricity, so its customers can use Efficiency Works, the rebate program Platte River Power Authority manages for its four owner communities. For an ENERGY STAR heat pump water heater, Efficiency Works pays up to $600 when it replaces an electric or propane water heater and up to $400 when it replaces gas. Apply within 45 days; the retail route needs proof of installation or delivery. A panel upgrade to 200 amps or more, done by a licensed electrician with the heat pump, can add up to $500.
Gas in Longmont comes from Xcel Energy, according to the City. Xcel lists a $750 standard heat pump water heater rebate for Colorado electric, gas or combined customers, subject to its eligibility rules, and nothing for gas tanks or tankless units. Colorado’s $250 heat pump credit takes at least $83 off the invoice when a state-registered installer does the work. Check current amounts before you buy; our guide to heat pump water heater rebates covers the paperwork.
Longmont water heater permits: $40 plus sales tax
Longmont lists water heaters among the appliances that need a permit. The City’s FY2026 Fee Manual sets the fee at $40, plus sales tax on half the project valuation at 4.865% (3.53% city, 1.335% county), or about $24 per $1,000 of job value. City of Longmont Building Services issues permits and inspects from the Development Services Center, 385 Kimbark St (303-651-8332). Boulder County is one of Colorado’s local inspection areas, so the state doesn’t inspect here.
The City lets homeowners do permitted work on their own property without a license, but anyone they hire must be licensed to work in Longmont, and plumbing businesses must register with the state and with the City’s Division of Building Inspection. State rules add that the home can’t be for sale, a flip or a rental. The City also warns that unpermitted work can, in some circumstances, invalidate your insurance. Since July 1, 2026, Longmont has enforced the 2024 International Codes.
Longmont homes and elevation
About 100,109 people live in Longmont (U.S. Census Bureau, Vintage 2025 estimate). Of its 43,528 homes, 37.1% were built before 1980 and 17.0% in 2010 or later, with a median year built of 1991 (U.S. Census Bureau, ACS 2020-2024 5-year estimates), so replacements here range from decades-old installations to first replacements in newer homes.
The city’s USGS reference point is 4,980 feet. That puts it in Rinnai’s 2,001 to 5,200 foot tankless setting and below the 5,400 feet where Navien’s NPE-2 natural gas units need a high-altitude kit. Settings follow your home’s own elevation and each manufacturer’s instructions.
What happens when you call
- Describe it: fuel, age, location and symptoms.
- Diagnosis on site by a licensed plumber, covered by liability insurance.
- A written, itemized quote listing the heater, parts, the City permit, code upgrades and haul-away.
- The work and testing, then the City inspection, which we schedule.
Other areas we serve
Nearby places we also cover:
Water heater repair in Longmont FAQ
How much is a water heater permit in Longmont?
$40 under the City’s FY2026 Fee Manual, plus 4.865% sales tax on half the project valuation. The permit is a line item on your written quote.
Do I need a water softener for my water heater in Longmont?
The City says no: its water measures 1 to 2 grains per gallon, 21.7 mg/L on average in 2025, and it does not recommend a softener. A.O. Smith adds that a softener wears a tank’s anode rod faster.
What rebates can I get on a heat pump water heater in Longmont?
As a Longmont Power & Communications customer, up to $600 from Efficiency Works when replacing an electric water heater or $400 when replacing gas, plus Colorado’s $250 heat pump credit. Check current amounts first.
Can I replace my own water heater in Longmont?
Yes, if you do the work yourself on a home that isn’t for sale, a flip or a rental; the City allows homeowners to do permitted work on their own property. You still need the permit and an inspection.
Who inspects water heater work in Longmont?
City of Longmont Building Services. Boulder County is one of Colorado’s local inspection areas, so the City, not the state, issues the permit and inspects.
Does Longmont’s elevation affect a tankless water heater?
Yes. At 4,980 feet, gas flow must be adjusted for altitude under the fuel gas code; Rinnai units use their 2,001 to 5,200 foot setting, and Navien’s NPE-2 high-altitude kit isn’t needed below 5,400 feet.
Water heater trouble?
Call for water heater repair, installation or replacement in Longmont.
Honest repair-or-replace advice, written and itemized quotes, and tank, tankless or heat pump options.
Water heater replacement, repair and tankless installation for Fort Collins, Loveland and Larimer County. Written, itemized quotes and licensed plumbers.
Call (970) 305-5633