Tankless Water Heater Installation

Endless hot water, more floor space, and a unit built to last. We help you decide if tankless is the right call, size it for your home, and install it — often the same day. A tankless water heater installation takes more planning than a tank swap, and we handle the gas, vent and electrical side of it.

  • Endless On-Demand Hot Water
  • Gas & Electric Tankless Units
  • Upfront Pricing — No Surprises
(983) 209-1502

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Endless Hot Water

On-demand heating means you never run out mid-shower. Hot water is made as it moves through the heater, so nothing sits waiting. Tankless water heaters heat only what you actually draw.

Same-Day Install

Most tankless installs happen the same day you call. Most tankless water heaters we put in are running by that evening, and a straightforward water heater installation rarely needs a second visit.

Upfront Pricing

Full price — unit, labor, haul-away — before we start. The cost covers the gas line, the vent run, and any plumbing or water lines we have to move.

Licensed & Insured

Water heater experts handling gas, venting, and electrical right. We size the gas lines, check the vent path, and confirm the electrical and plumbing before we start. Local codes get checked on the same visit.

Is Tankless Right for You?

Tankless isn't the answer for every home, but it's a strong fit for plenty. Here's when it tends to make sense — and we'll give you a straight read on your setup. Some homes need very little work. Others need a bigger gas line and a new vent run before a tankless water heater installation makes sense.

You Want Hot Water That Never Runs Out

A tankless unit heats water as you use it, so it doesn't drain a tank and leave you cold. Long showers and back-to-back loads stop being a problem. Water moves across the heat exchanger only while a tap is open, so the hot water keeps coming as long as you need it. A tank cannot do that once the stored water is gone.

You're Short on Space

There's no big tank to find room for. A tankless unit mounts on the wall, freeing up the closet, garage, or basement corner. That matters most in older Boulder homes where the water heater sits in a tight closet with the rest of the plumbing. A wall-mounted water heater gives that closet back.

You Want a Lower Energy Bill

Because it only fires up when you turn on the tap, a tankless heater isn't paying to keep a full tank hot all day. Most homes see a smaller monthly bill. Tankless water heaters only draw gas when water is actually moving, which is where the savings come from. There is no standby loss keeping stored water hot overnight.

You're Planning to Stay Put

A tankless unit typically lasts 15 to 20 years, well past a tank's 8 to 12. If this is your long-term home, the longer lifespan pays off. Most tankless water heaters reach that age with one professional service a year, and parts are still easy to get late in their life.

Your Tank Is Already on Its Way Out

If you're replacing an old unit anyway, it's the natural moment to go tankless. You're paying for the install either way. Doing the water heater installation once, with the gas line and vent sized correctly, is a lower total cost than paying for the same labor twice.

Your Household Demand Is High

A big family, multiple bathrooms, or a soaking tub can outrun a tank. Sized right, a tankless unit keeps hot water flowing to several fixtures at once. We look at how many fixtures run at once and pick a capacity that covers your busiest morning, so the water heater is not undersized on day one.

What's Involved in Going Tankless

A tankless unit works differently than a tank, so the install is a bit more involved. Here's what it takes to do it right. Most of the extra work is in the gas line, the vent, and the water lines feeding the heater. Water heaters mounted on an outside wall change the vent path too.

Gas Lines, Venting System & Electrical Connections

A tankless unit usually needs a bigger gas line and its own venting. Electric models may need a heavier circuit. We check what your home has and update what's needed so the unit runs right. We pull a permit where local codes call for one, and leave the gas pressure and electrical connections documented for safety.

Sizing and Capacity for Endless Hot Water

Tankless units are rated by gallons per minute, and the colder the incoming water, the harder they work. We size yours for your fixtures and our cold winter inlet so you never run short. Boulder water comes in cold most of the year, so tankless water heaters rated for a warmer climate feel weak here. We work from the water temperature you actually get, not a national average.

Descaling & Maintenance

Tankless units run a yearly descale flush to clear mineral buildup and keep the heat exchanger clear. We set yours up and walk you through keeping it healthy for the long haul. The flush takes about an hour and keeps water moving through the exchanger the way it should. Tankless water heaters that skip it lose efficiency and eventually fault out.

Not sure tankless is the move? We also lay out tanks and the broader sizing and fuel choices on our water heater installation page, and we'll talk it through with you either way. Both paths end with a professional water heater installation sized for your home, whether that turns out to be a tank or a tankless water heater.

How Our Tankless Installation Works

Simple, straightforward. Here's how it works. Four steps, from the first call to a finished installation and hot water at the tap.

Step 1

You Call or Text

Tell us a bit about your home and how your household uses hot water. We'll ask a few quick questions and set up a visit. Same-day is usually available.
Step 2

We Size It & Check Your Setup

We look at your gas line, venting, and electrical, then size the right unit by your fixtures and water demand. You'll know if anything needs upgrading before we quote.
Step 3

Upfront Price, Your Call

Before any work begins, you get the full price in writing, with the unit, labor, and haul-away of the old tank all included. No surprises later.
Step 4

Installed, Tested & Hot Water On

We mount and connect the new unit, set the temperature, and run it before we leave. You've got endless hot water and the old tank is gone.
(983) 209-1502

Why Homeowners Choose Us

Daniel's Water Heater Repair technician installing a tankless water heater

We're water heater experts — repair, replacement, and installation is all we focus on, so we'll tell you straight whether tankless actually fits your home instead of pushing the most expensive unit. That focus is why the plumbing on a tankless water heater installation gets done to code instead of left for someone else to sort out.

Every make and model, the gas, venting, and electrical handled in one visit, and the full price before any work starts. A real person answers 24/7 at Daniel's Water Heater Repair, and we serve homeowners across Boulder and the surrounding metro. That covers the gas line, the vent, the water lines and the electrical in one trip, down to the shutoff valve and the pressure relief line.

Tankless Water Heater FAQ

These come up on almost every tankless job, so here's the straight answer to each. Cost, capacity, and how long a water heater installation takes are the three we hear most.

Most tankless installs land between $2,000 and $6,000. Where you fall depends on the unit and whether your gas line, venting, or electrical needs upsizing to feed it. We sort all of that out first, then hand you one upfront price before any work starts. Upsizing a gas line or adding a vent run is the most common reason one job runs higher than another. A professional water heater installation quote should name those line items before you agree to anything.

For a lot of homes, yes. You get hot water that doesn't run out, a longer-lasting unit, a smaller footprint, and usually a lower energy bill. The trade-off is a higher price up front. If you're staying in the home and tired of running cold, it tends to pay off. Homes that run several fixtures at once notice the difference in hot water first. Tankless water heaters hold their temperature better when two showers overlap.

Around 15 to 20 years, noticeably longer than the 8 to 12 a standard tank gives you. Part of that is design — there's no tank of water sitting and slowly corroding — and part is the yearly descale that keeps the heat exchanger clean. A yearly service also keeps the water pressure steady as the heater ages, and a professional flush protects the valve and the pipe runs feeding it.

They do, but it's simple. Once a year the unit gets a descale flush to clear mineral buildup off the heat exchanger so it keeps heating efficiently. We set that up when we install it and show you what to watch for in between. We show you where the isolation valve sits so a future flush is simple, and we leave the shutoff valve easy to reach. Water pressure gets checked at the same time.

Yes, and it's a common request when an old tank is ready to go. We pull the tank, run the gas, venting, or electrical the new unit needs, mount it, and haul the old one away. We'll walk you through what your home needs before we start. Swapping a tank for tankless usually means new pipe runs and a different vent, so we confirm both before the day of the job. The old water heater goes out the same day.

A tankless install usually takes the better part of a day — figure 4 to 8 hours. There's more to it than a tank swap: we're often upsizing the gas line, adding dedicated venting, or running new electrical to feed the unit. You'll get a firm window once we've sized the job. Older homes with tight plumbing take the longer end of that range, and a water heater installation in a finished basement adds time.

Thinking About Going Tankless?

Call or text — a real person answers 24/7, and same-day installation is the norm. Ask about a tankless water heater installation and we will quote the gas, vent and electrical up front. Same-day service is normal, and the price holds.

(983) 209-1502

No hot water? Call us now.

We answer 24/7 — same-day water heater service.

(983) 209-1502

Tap to call — available day, night, weekends, holidays.

⚠ Don't Wait

No hot water? Leaking tank?

Water heater problems get worse fast — a small leak can turn into a flood. Call now and we'll get a technician out, usually the same day. The same goes for tankless water heaters, where a leak often shows at the water connections first. Shut the water off at the valve and call.

Call (983) 209-1502