Denver Water Heater Repair And Installation: Tank, Tankless, And Heat Pump
No hot water, a leaking tank, or a unit at the end of its life. We repair and replace gas and electric water heaters across Denver Metro, and we install all three types: conventional tank, tankless, and heat pump water heaters. Licensed plumbers, permitted work, and a written price before anyone starts.
Tell Us What Is Happening
House Bill 23-1161 took effect January 1, 2026. Any new gas fired water heater sold or installed in Colorado has to meet ultra low nitrogen oxide emission limits, or be certified under current ENERGY STAR standards. You are not required to replace a working water heater, and repairs to existing units are still allowed. What changed is what can be installed when yours does fail. Units already in Colorado inventory before the deadline can still be used, but that stock is selling through, which means fewer size options and longer lead times. We tell you what is actually available for your setup before you commit.
Three Ways To Make Hot Water, And They Are Not Interchangeable
What are the types of water heater? A conventional tank heater stores hot water and keeps it hot until you use it. A tankless water heater has no storage and fires only when you open a tap, heating water as it passes through. A heat pump water heater has a tank but makes heat differently, pulling warmth out of the surrounding air rather than burning fuel or running a resistance element.
Which one belongs in your house depends on your gas line, your electrical panel, how much space the mechanical room has, how many fixtures run at once, and how long you plan to own the home. It is a genuine decision with real tradeoffs, not an upsell ladder. The table further down is the same comparison we walk through on site.
Tank Vs Tankless Vs Heat Pump Water Heater
Most Denver plumbers show you one option. Here is the honest comparison across all three, including where each one is the wrong choice.
| Factor | Conventional Tank | Tankless | Heat Pump |
|---|---|---|---|
| Upfront cost | Lowest of the three. | Higher, and higher again if the gas line or venting needs work. | Highest before rebates, often much closer after them. |
| Operating cost | Highest. The tank loses heat around the clock whether you use it or not. | Lower. Nothing is kept hot between draws. | Lowest by a wide margin. It moves heat instead of making it. |
| Hot water supply | Finite. Back to back showers can empty it, then you wait for recovery. | Endless, but limited by flow rate. Too many fixtures at once drops the temperature. | Finite like a tank, with slower recovery in high demand mode. |
| Space needed | A tank sized footprint, floor mounted. | Smallest. Wall mounted, frees the floor entirely. | Largest. Needs a tank plus air volume around it, or ducting. |
| Electrical | Standard receptacle for a gas unit. Existing circuit for electric. | Gas units need a receptacle. Electric tankless needs very heavy service. | Dedicated 240 volt circuit, and panel capacity confirmed by load calculation. |
| Gas and venting | Existing gas line and flue usually work for a like for like swap. | Frequently needs the gas line upsized and dedicated stainless or PVC venting. | None. No gas line, no combustion, no flue. |
| Colorado NOx law | Gas models must now meet ultra low NOx limits. | Gas models must now meet ultra low NOx limits. | Not affected. There is no combustion to regulate. |
| Side effects | None beyond the standby loss. | Needs annual descaling in hard water, which Denver has. | Blows cool, dehumidified air into the space and needs a condensate drain. |
| Best fit | A fast like for like replacement when the old one fails and budget is the constraint. | Tight mechanical rooms, high hot water demand, long ownership horizon. | Homes with panel headroom, a basement or garage with air volume, and an eye on operating cost. |
Which One Should You Actually Get?
Five situations that cover most of the calls we take.
My Water Heater Just Died And I Need Hot Water Today.
I Want The Lowest Monthly Cost.
We Run Out Of Hot Water With Back To Back Showers.
My Mechanical Room Is Tight.
I Plan To Go All Electric Eventually.
Water Heater Services We Provide
Repair through replacement, gas and electric, residential and commercial.
Water heaters are one part of our full range of Denver plumbing services. If your home is heated by a boiler, see our boiler repair and installation page, since replacing one often affects the other.
Four Things That Affect Water Heaters In Denver
Three of these change what we install. One of them is a code requirement most homeowners have never heard of.
Hard Water And Sediment
Denver water carries enough mineral content to matter over the life of a water heater. Sediment settles on the bottom of a tank, insulates the burner from the water above it, and shows up as rumbling and slower recovery long before the unit fails. On tankless units the same minerals scale the heat exchanger, which is why annual descaling is maintenance rather than an upsell. A sacrificial anode rod protects the tank lining, and checking it is the cheapest way to add years to a heater.
The Thermal Expansion Tank Requirement
Water expands when heated. In an open system it pushes back into the main. In a closed system, which is what you have if there is a pressure reducing valve or a backflow preventer on the service, it has nowhere to go. Pressure spikes, the relief valve weeps, and fixtures and the tank itself take the strain. Code requires a thermal expansion tank on a closed system. We check for one on every replacement, and we find plenty of installations that never had it.
Derating At 5,280 Feet
Combustion appliances lose input capacity as altitude rises, and manufacturers publish derate figures that apply across the Front Range. A gas water heater or tankless unit sized off a sea level rating comes up short on the coldest incoming water of the year, which in Denver is exactly when you notice. Sizing has to account for elevation and for winter inlet temperature, not just fixture count.
Shared Flues And The Boiler Next To It
In many older Denver homes the water heater shares a chimney with a boiler. Replace either appliance with a condensing unit that vents out a side wall and the other one is left alone on a flue sized for two, where exhaust cools, condenses, and can spill back into the house. We look at both appliances together rather than quoting one in isolation.
A heat pump water heater runs on a dedicated 240 volt circuit. Whether your panel has room for it is a load calculation under NEC 220.82, not a guess and not a rule of thumb. Run correctly, that calculation frequently shows the existing service is fine, which means the panel upgrade a lot of homeowners are told to expect never needs to happen.
When the panel genuinely is full, we do that work ourselves under our own electrical license, on the same visit, quoted in the same written price. No second contractor, no second trip charge, no waiting two weeks with no hot water while two companies try to find a shared date.
Electric tankless units are worth a separate warning. They draw far more current than most homes can supply, and the service upgrade they require is often the reason they stop making sense. We will tell you that before you buy one, not after.
Call Right Away For These
If you smell gas, leave the building first and call from outside. For water, close the cold inlet valve on top of the heater and shut off the power or gas to it.
Get The Comparison, Then The Price
A licensed plumber looks at your gas line, your panel, your space, and your hot water demand, then tells you which of the three types actually fits and what it costs, in writing, before any work begins.
Same day replacement available. Financing options available for qualifying projects, subject to credit approval.
