New water heater installation
Water Heater Installation in Denver, CO
We size the unit to how your household actually uses hot water, pull the Denver permit, install it to code, and haul the old tank away the same day.
- Same-day and next-morning installs
- Permit pulled and inspection scheduled
- Old unit hauled away
- 6-year and 10-year tank options
Most Denver homeowners only shop for a water heater twice in their lifetime, and usually in a hurry. That rush is why so many replacements go in undersized, over-sized, or with the same code violations the last installer left behind. We slow the decision down by about fifteen minutes: we look at how many people shower in the morning, what your tub holds, whether the laundry runs at the same time, what fuel is already at the appliance, and how much room the closet or mechanical space actually gives us. Then we quote a unit that fits the house instead of the truck.
We install every category of residential water heater sold in Colorado — atmospheric-vent gas tanks, power-vent gas, direct-vent, standard electric, hybrid heat pump, condensing and non-condensing tankless, and point-of-use units for a remote bathroom or wet bar. Brands we install and warranty-service include Rheem, A. O. Smith, Bradford White, State, Navien and Rinnai. If you have already bought a unit, we will install it; if you want us to supply it, you get contractor pricing and the manufacturer's labor warranty registered in your name.
What water heater installation includes
A proper install is not just swapping a tank. Every installation we do in Denver covers the following, and the price we quote on the phone is the price that includes them:
Load calculation and sizing
First-hour rating and peak-demand math based on fixture count, tub capacity and household size — not a guess from the old tank's label.
Shutdown and safe drain
Gas or power isolated, supply closed, tank drained and, in finished basements, pumped out rather than gravity-drained across your floor.
Code corrections
Correct T&P discharge pipe to within 6 inches of the floor, drip leg on the gas line, dielectric unions, full-port shutoff, proper venting slope and drafting.
Thermal expansion control
If your home has a pressure-reducing valve or backflow preventer — most Denver Water service addresses do — a correctly pre-charged expansion tank is installed or re-charged to your static pressure.
Set, fill and combustion check
Unit leveled and strapped as needed, lines purged of air, thermostat set to 120°F, and on gas units a draft and combustion check at Denver's 5,280-foot elevation.
Permit, inspection and haul-away
We pull the Denver plumbing permit, meet the inspector, and take the old heater with us for scrap recycling.
Choosing the right type for your house
Four questions settle most of it: what fuel is at the appliance now, how much space you have, how long you plan to stay, and whether you are chasing lower bills or lower upfront cost.
| Type | Best fit in Denver | Typical life | Watch out for |
|---|---|---|---|
| Atmospheric gas tank | Homes with an existing B-vent or chimney liner and a basement mechanical room | 8–12 years | Post-2015 units are taller and wider; a 1990s closet may no longer fit |
| Power-vent gas tank | Finished basements and interior closets with no usable chimney | 8–12 years | Needs a nearby outlet and a condensate path; the blower is audible |
| Standard electric tank | Condos, townhomes and homes with no gas line at the heater | 10–15 years | Slower recovery — size up a tier if you have a big soaking tub |
| Hybrid heat pump | Basements with 700+ cu ft of open air and a floor drain | 13–15 years | Cools and dehumidifies the space it sits in; check current Xcel and Denver rebates |
| Tankless gas | Bungalows and row homes tight on square footage, or high simultaneous demand | 18–20 years | Usually needs a gas line upsize and new stainless venting |
If you want the full comparison with real numbers for a Denver household, our water heater cost guide breaks down installed pricing by type and size.
Sizing: the part most installers skip
Tank capacity alone is a poor predictor of whether you run out of hot water. What matters is first-hour rating (FHR) on a tank, or gallons per minute at your incoming water temperature on a tankless unit. Denver's groundwater arrives cold — in the 40s Fahrenheit through the winter — so a tankless unit rated 9.8 GPM on a California spec sheet delivers closer to 5 GPM here at a 70-degree rise. We size to the January number, not the brochure number.
| Household | Peak hour demand | Gas tank | Electric tank | Tankless (winter) |
|---|---|---|---|---|
| 1–2 people, one bath | ~30 gal | 30–40 gal | 40 gal | 5.0–6.6 GPM |
| 3–4 people, two baths | ~45 gal | 40–50 gal | 50–66 gal | 6.6–8.0 GPM |
| 5+ people, or a soaking tub | ~65 gal | 50–75 gal | 80 gal | 8.0–9.8 GPM or two units |
| Two simultaneous showers | ~55 gal | 50 gal high-recovery | 80 gal | 9.0+ GPM |
Denver code and permit requirements
Water heater replacement in the City and County of Denver requires a plumbing permit, and the work is inspected. That is not red tape for its own sake — the inspection catches the three failures we see most often on uninspected installs: a T&P relief line that terminates too high or reduces in size, a flue that back-drafts into a finished basement, and a missing expansion tank on a closed system.
Altitude matters here too. At 5,280 feet there is roughly 17 percent less oxygen per cubic foot of air than at sea level. Most residential gas water heaters are certified from the factory for installation up to about 10,100 feet, but combustion air, vent sizing and draft still need to be verified in the field — especially in tight, newer homes where the mechanical room has been sealed up during a remodel. We check draft on every gas install before we leave.
Ask any bidder for the permit number
If a quote is unusually cheap, it is almost always because no permit is being pulled. An unpermitted water heater can surface later as a condition on your home inspection when you sell, and insurers have denied water-damage claims over uninspected installs. Every install we do in Denver is permitted and inspected.
How long a Denver install takes
A like-for-like tank swap in an accessible basement runs two to three hours. Add an hour if we are correcting venting or gas piping. Converting from tank to tankless is a full day, sometimes two, because it involves new venting through a wall, a gas line upsize in most bungalows, and a condensate drain on condensing models. Electric to heat pump conversions usually take three to five hours and depend on whether a 240-volt circuit and drain are already there.
We schedule two-hour arrival windows, text when the truck is en route, and protect floors and stair runs on the way in and out. If your existing heater has already failed, say so when you call — we keep the common 40- and 50-gallon gas and electric sizes on the truck so that a single visit ends with hot water.
Frequently asked questions
How much does water heater installation cost in Denver?
Installed pricing in the Denver metro generally lands between $1,450 and $2,400 for a standard 40–50 gallon gas or electric tank including permit, code corrections and haul-away; $2,200–$3,200 for a power-vent gas tank; $3,400–$5,200 for a hybrid heat pump unit before rebates; and $4,200–$6,800 for a tankless conversion that needs new gas and venting. Your exact number depends on the unit chosen and what the existing installation needs corrected. We quote a flat price before any work begins.
Do I need a permit to replace a water heater in Denver?
Yes. The City and County of Denver requires a plumbing permit for water heater replacement, and the installation is inspected. We pull the permit under our license, schedule the inspection and meet the inspector, so nothing lands on you.
Can you install a water heater I bought myself?
We can. You get our labor warranty on the installation, and the manufacturer's warranty on the unit stays yours to administer. One caution: big-box units are often the builder-grade version of a model line with a shorter warranty and a lighter anode, so compare the model number carefully before you buy.
How long does a new water heater last in Denver?
Eight to twelve years for a tank that is flushed annually, ten to fifteen for electric, and eighteen to twenty for a well-maintained tankless unit. Homes in the south metro running Denver Basin well water see scale build faster than homes on Denver Water's snowmelt supply, which shortens tank life if maintenance is skipped.
Should I upgrade capacity while I am replacing it?
Only if you actually ran out of hot water with the old unit, or the household has grown. An oversized tank costs more upfront and standby-loses heat you never use. If you were running short, a high-recovery model in the same physical footprint is often the smarter move than a taller tank that will not clear the closet header.
What is the difference between a 6-year and a 12-year warranty tank?
Usually a thicker anode rod (sometimes two), a slightly better tank liner and heavier elements or burner. The physical difference is real but modest; a 6-year tank with an anode replaced at year four often outlives a neglected 12-year tank. If you plan to stay in the home ten-plus years, take the longer warranty.
Cold shower this morning? We can be out today.
Tell us what the heater is doing and we will give you a straight answer on the phone — repair, replace, or wait.