Tankless Water Heater Installation Littleton CO gives you endless hot water and cuts standby heat loss that tank units waste every day. We install Navien, Rinnai, and Rheem units sized for your home, your gas line, and Colorado's cold incoming water. If you're tired of running out of hot water mid-shower, we can have a new unit running in a day.
Tankless Water Heater Installation Littleton CO is the process of replacing a storage tank water heater with a wall-mounted on-demand unit that heats water only when you open a tap. We run the gas line, mount the unit, install the venting, and dial in the temperature controller so your shower stays hot from the first minute to the last. Most homes here need a 199,000 BTU condensing unit to handle Colorado's 45-degree incoming water in winter.
Littleton homes built before 1990 often have undersized gas lines and no dedicated vent path, so a tankless swap takes real planning. We've done enough of these in Arapahoe County to know which neighborhoods have 1/2-inch gas runs that need upgrading and which crawlspaces make condensate drainage tricky. If you're comparing on-demand water heater installation Littleton CO options, we'll tell you straight whether your home is a good fit.
Every tankless install includes the unit, labor, permit, and standard materials. If your home needs a gas line upgrade or custom venting, we'll quote that upfront so there are no surprises.
We supply the tankless unit, isolation valves, pressure relief valve, and expansion tank. We use brass fittings and stainless flex connectors where code allows. The unit is sized for your home's hot water demand and Colorado's cold incoming water.
We run the gas line from your meter to the unit and install the venting to code. Condensing units need PVC or stainless venting with a condensate drain. If your gas meter is undersized, we coordinate the upgrade with Xcel Energy.
Littleton requires a plumbing permit and a gas appliance permit for tankless installs. We pull both, schedule the inspection, and meet the inspector on site. The permit fee is included in your quote.
We drain and disconnect your old water heater, haul it out, and dispose of it properly. If there's sediment buildup in the lines, we flush them before connecting the new unit. You don't have to lift a finger.
We fire the unit, set the temperature, and run hot water at every fixture to check flow and pressure. You get a walkthrough on the controller, error codes, and maintenance schedule. We also show you how to shut off the gas and water if needed.
We measure your incoming water temperature, count your fixtures, and check your gas meter capacity. A 3-bedroom home with two bathrooms typically needs a 199,000 BTU unit. We also verify venting options and condensate drain locations. This takes about 45 minutes.
You get a written price before we start. If your gas line needs upgrading from 1/2-inch to 3/4-inch, that's included in the quote. No surprise charges after the work is done. We'll also tell you if a tankless unit isn't the right fit for your home.
We shut off the gas and water, drain the old tank, and haul it away. If you have a sediment buildup issue in your old unit, we'll flush the lines before connecting the new one. Most removals take 1-2 hours depending on access.
We mount the unit, run the gas line, install the pressure relief valve and expansion tank, and run PVC or stainless venting to code. Condensing units need a drain for the acidic condensate. We test the gas valve and thermocouple connections before firing.
We fire the unit, set the thermostat to your preferred temperature, and run hot water at every fixture to check flow. You get a walkthrough on the controller and maintenance schedule. Total install time is usually 4-8 hours for a standard swap.
We measure your incoming water temperature, count your fixtures, and check your gas meter capacity. A 3-bedroom home with two bathrooms typically needs a 199,000 BTU unit. We also verify venting options and condensate drain locations. This takes about 45 minutes.
For cutting and fitting gas and water lines. We use a tube cutter for clean, square cuts on copper and PEX, and a pipe wrench for tightening threaded fittings.
For copper pipe connections where code requires soldered joints. We use lead-free solder and follow EPA Lead-Safe practices on pre-1978 homes.
For testing electrical connections, thermostats, and heating elements. We verify voltage and resistance before firing the unit.
For flushing the heat exchanger with vinegar or descaling solution. This removes scale buildup that restricts flow and reduces efficiency.
For checking venting paths, gas line routing, and crawlspace conditions. We use it to confirm there are no obstructions before running new lines.
For testing incoming water pressure and gas pressure. Tankless units need specific pressure ranges to operate correctly.
A family of four in Ken Caryl had a 12-year-old 50-gallon tank that ran cold after two showers. Morning routines were a constant battle, and the tank was showing rust at the bottom.
After: We installed a Navien 199,000 BTU condensing unit with a 3/4-inch gas line upgrade. Now they can run two showers and the dishwasher at once. Their gas bill dropped $24/month, and the old tank is gone.
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A 1925 home near Downtown Littleton had a water heater closet barely wide enough for a 40-gallon tank. Three plumbers said tankless wouldn't fit. The homeowner was stuck with limited hot water.
After: We mounted a Rinnai unit on the basement wall and ran PVC venting through the rim joist. The closet is now storage space, and the homeowner has endless hot water for the first time.
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A homeowner in Roxborough noticed water pooling under their 14-year-old tank. The tank was rusting through, and they were worried about a basement flood while they were at work.
After: We replaced the tank with a Rheem tankless unit the next day. The old tank was hauled away, and we installed a drain pan and condensate line. No more leak risk, and hot water is endless.
Book this service →If you're dealing with any of these issues, a tankless unit can fix the problem for good. We'll tell you honestly whether tankless is the right solution or if a repair makes more sense.
Ask a pro →A properly sized tankless unit delivers 9-11 gallons per minute continuously. You can run two showers, a dishwasher, and a washing machine at the same time without losing temperature. We size the unit based on your fixture count and incoming water temperature.
Tankless units only fire when you open a tap. There's no standby loss, so you're not heating water you're not using. Most Littleton homeowners see $15-$30/month in gas savings, which adds up over the unit's 20-year lifespan.
We replace leaking tanks with tankless units that mount on the wall and have no tank to rust. If you catch the leak early, we can often do a same-day tankless water heater installation Littleton Colorado. We also install a pan and drain line to protect your floor.
A tankless unit takes up about 2 square feet of wall space. We can mount it in a basement, garage, or utility closet where a tank won't fit. You get more hot water and you get your floor space back.
Most tankless installs in Littleton run $3,200-$5,800 in 2026, depending on unit size, venting, and whether your gas line needs upgrading. A straight swap with existing 3/4-inch gas and PVC venting lands on the low end. Homes needing a new gas run or stainless venting push toward the high end. We quote the full job upfront.
Yes, if you plan to stay in your home more than 7 years. The unit costs $1,500-$2,500 more than a tank install, but it lasts 20 years instead of 10 and cuts gas use by 20-30%. Littleton's cold incoming water means you need a properly sized unit, so we'll run the numbers for your specific home before you decide.
A standard swap takes 4-8 hours. If we need to upgrade your gas line from 1/2-inch to 3/4-inch or run new venting through a finished wall, plan on a full day. We schedule most installs as a single-day job and have you back to hot water by evening.
Yes. Littleton requires a plumbing permit for any water heater replacement, and tankless units also need a gas appliance permit. We pull both permits and schedule the inspection. The permit fee is included in your quote. Skipping the permit can void your homeowner's insurance if there's a gas leak or flood later.
Call us for a same-day quote on tankless water heater installation in Littleton. We'll size the unit, check your gas line, and give you a written price before we start. Licensed, insured, and warrantied.
Get Free Quote +13038790886 →Call us at +1 303-879-0886 or send an email to info@littletonplumbingsolutions.com. We answer the phone 24/7 for emergencies and book regular service Monday through Friday. Most calls get a same-day slot, and we will give you a real arrival window, not a four-hour block.