Endless hot water, lower gas bills, and a 20-year unit
Tankless Water Heater Installation Sioux Falls SD Done Right
Tankless water heater installation Sioux Falls SD homeowners can count on starts with a proper load calculation, not a box swap. We size the unit to your fixtures, run the gas line and venting to code, and flush-test every connection before we leave. If your tank is rusting out or you are tired of cold showers after the third load of laundry, call us at +1 (713) 655-1138 for same-day pricing.
Live dispatcherUpfront optionsBacked workmanship
What's included
What Our Tankless Installation Includes
Every tankless job we quote covers the unit, the permit, the labor, and the startup. Here is what is in the price, and what we handle as an add-on when your home needs it.
Unit and Mounting
We supply and mount a Rheem, Navien, Rinnai, or A.O. Smith condensing unit on a rated bracket. Includes the condensate drain line, neutralizer, and a dedicated 120V circuit for the control board.
Gas Line and Valve
We run the gas supply to code, install a shut-off valve and sediment trap, and pressure-test the line. If your meter or existing stub cannot carry the BTU load, we upsize it as part of the job.
Venting and Combustion Air
Category III PVC or stainless venting through the roof or sidewall, sized to the manufacturer's spec. We seal the penetration, support the run, and confirm clearances to combustibles before inspection.
Water Connections
Hot and cold lines tied in with copper pipe or PEX tubing, plus a bypass valve kit for future descaling. We install a sediment filter on the cold inlet to protect the heat exchanger from Sioux Falls hard water.
Permit and Inspection
We pull the City of Sioux Falls mechanical permit, schedule the inspection, and meet the inspector on site. You get the signed tag and the paperwork for your records.
Startup and Walkthrough
Burner fired, outlet temperature set to 120 degrees, every hot fixture tested at once. We hand you the manual, warranty card, and a descaling schedule, and we haul away the old tank at no extra charge.
Service overview
Tankless Water Heater Installation Sioux Falls SD Explained
Tankless water heater installation Sioux Falls SD is the trade of replacing a storage tank with a wall-mounted heat exchanger that fires only when you open a hot tap. We pull the old tank, cap the flue, mount the new unit on a rated bracket, and run dedicated gas and water lines. A Navien or Rinnai unit heats water as it flows, so you never run out mid-shower. Most homes here need a 199,000 BTU condensing model, 3/4-inch gas supply, and a Category III PVC vent run.
Sioux Falls homes built before 1980 usually have 40- or 50-gallon tanks tucked in a basement corner with a 1/2-inch gas stub that will not feed a tankless burner. That is the number-one reason a DIY install fails inspection. We upgrade the gas line, add a shut-off valve and sediment trap, and bond the unit to the existing copper pipe or PEX tubing. If you are searching for tankless water heater services near me Sioux Falls, we cover Minnehaha County seven days a week.
How we workWe verify the cause, compare realistic options, and confirm the repair before we leave.
The service timeline
Our Tankless Installation Process
The process flexes to the condition, but these checkpoints keep decisions clear.
Phone Sizing
We ask how many bathrooms, whether you have a soaking tub, and what fuel you use. That tells us the flow rate and BTU input you need. You get a firm price range on the call, not a vague 'we will see when we get there.' Most Sioux Falls jobs land between $2,800 and $4,600 installed.
On-Site Assessment
A licensed tech checks your gas meter capacity, existing 1/2-inch or 3/4-inch supply, vent path, and water hardness. We use a pressure gauge and a leak detection microphone on the old lines. You get a written scope the same visit, usually within 45 minutes.
Permit and Prep
We pull the mechanical permit through the City of Sioux Falls and schedule inspection. Gas line upsizing, vent penetration, and a dedicated 120V circuit for the unit happen before the new heater goes on the wall. This is the step DIY installs skip and inspectors catch.
Install Day
We drain and remove the old tank, cap the flue, mount the new unit, and run gas, water, and condensate lines. A pipe cutter and soldering torch handle copper; PEX crimping tool handles the rest. Expect four to six hours of work, then a full system pressure test at 100 PSI.
Test and Walkthrough
We fire the burner, set outlet temperature to 120 degrees, and run every hot fixture in the house at once to confirm flow. You get the manual, the warranty card, and a descaling schedule. We do not leave until you have taken a hot shower and the inspection tag is signed.
Tools & methods
Tools and Methods We Use
Purpose-built equipment, used by trained technicians, so the job is done accurately the first time.
RIDGID Pipe Wrench and Cutter
Breaking and re-making gas and water connections on black iron and copper. A clean cut means a square seat and no leaks at the joint.
PEX Crimping Tool
Making ASTM-rated crimp connections on PEX tubing runs. Faster than soldering and just as reliable when the ring is set to spec.
Soldering Torch and Flux
Sweating copper pipe joints on the hot and cold tie-ins. We use lead-free solder and clean flux, then pressure-test every joint at 100 PSI.
Pressure Gauge
Confirming incoming water pressure and holding the system at test pressure before we close up. A gauge catches a pinhole leak before it becomes a wall stain.
Leak Detection Microphone
Listening for hidden leaks in walls and under slabs before we tie a new heater into a failing line. It finds the problem the eye cannot.
Milwaukee Cordless Tools
Drilling vent penetrations, driving brackets, and cutting pipe in tight mechanical closets where a cord will not reach.
Combustion Analyzer
Verifying CO and O2 levels at startup on every condensing unit. It confirms the burner is running clean before we sign off.
Use cases
When to Schedule a Tankless Install
These examples show how the service framework adapts rather than forcing every call through one repair.
Basement Corner Reclaimed in Whittier
A Whittier homeowner had a 40-gallon tank in a low-ceiling mechanical closet with no room to upgrade. The tank was nine years old, and the family was down to one hot shower at a time. A bigger tank was not physically possible. → We mounted a Rinnai unit high on the wall, ran a new 3/4-inch gas line, and vented through the rim joist. The old tank footprint became storage space. Two showers and the dishwasher now run together with no temperature drop.
Pre-Sale Conversion in McKennan Park
A McKennan Park home was under contract when the inspector flagged the 11-year-old water heater and an unpermitted vent. Closing was 12 days out, and the buyer wanted the issue resolved before signing. → We pulled the mechanical permit, installed a Rheem condensing unit, corrected the venting, and passed inspection in one visit. The signed tag went into the disclosure packet, and the sale closed on schedule.
Problems we solve
Problems a Tankless Conversion Solves
Most people call us because something already went wrong. Here are the four problems we hear about most in Sioux Falls, and how a proper install fixes each one.
Running out of hot water mid-shower
We size a tankless unit to your actual fixture count, not a rule of thumb. A 199,000 BTU condensing heater delivers 4.5 to 6.0 GPM at a 60-degree rise, enough for two showers plus laundry at the same time. You stop scheduling showers.
Rusty water and popping sounds from the tank
We drain and remove the failing tank before it lets go, then convert you to a tankless unit with a stainless or copper heat exchanger. No steel shell to rust, no stored water to flood your floor. We haul the old tank away the same day.
High gas bills from standby heat loss
A tankless unit only fires when you open a tap. Sioux Falls households typically cut water-heating gas use by 22 to 30 percent after conversion. At current rates that is $170 to $260 a year back in your pocket, plus a 20-year service life.
No space for a bigger tank
A wall-mounted tankless unit is roughly 18 by 28 inches and 40 pounds, so it fits where a tank cannot. We vent through the sidewall when roof access is tight and reclaim the old tank footprint for storage. You get more hot water and more floor space.
Pricing process
Tankless Water Heater Installation Cost
$2,800 - $4,600 installed, depending on gas, vent, and electrical scope
Gas line size and run
If your home has a 1/2-inch stub, we upsize to 3/4-inch black iron or CSST. A short run in an open basement adds $250 to $500. A long run through finished space or from an undersized meter adds more.
Vent configuration
Sidewall venting is simpler and cheaper than a roof penetration. If your mechanical room is interior, we may need a longer concentric vent run, which adds $300 to $700 in materials and labor.
Unit capacity and brand
A 199,000 BTU condensing unit from Navien or Rinnai costs more than a mid-range Rheem, but it handles colder inlet water better. We match the unit to your fixture count so you are not paying for capacity you will never use.
Customer reviews
What Sioux Falls Homeowners Say
★★★★★
“Our 50-gallon tank was 11 years old and we were down to two showers before cold water. The crew ran a new 3/4-inch gas line, mounted a Navien in the basement, and had us running hot water by 4 p.m. the same day. They even patched the old flue hole. Gas bill dropped about $19 the first month.”
★★★★★
“I called three places and these guys were the only ones who actually measured our gas meter before quoting. They upsized the supply, added a sediment filter, and set us up on a descaling plan. Six months in, no issues. The inspector signed off the first visit.”
★★★★★
“Old house, low ceiling, tight mechanical room. They found a Rinnai that fit the wall space and vented out the sidewall instead of the roof. Took five hours total. They cleaned up better than they found it and walked me through the temperature settings before they left.”
How much does tankless water heater installation cost in Sioux Falls SD?
Most installations run $2,800 to $4,600 in 2026, including the unit, permit, and labor. A straight swap with an existing 3/4-inch gas line sits near the low end. If we have to upsize the gas supply, add a vent run through a finished ceiling, or install a recirculation loop, expect the upper range. Electric tankless conversions often land $400 to $900 lower because there is no venting.
Is a tankless water heater worth it in Sioux Falls South Dakota?
Yes, if you plan to stay in the home more than five years. Our hard water shortens tank life to 8 to 12 years, so a tankless unit at 18 to 22 years avoids one full replacement. You also cut water-heating gas use by 22 to 30 percent. The break-even point for a family of four is usually year five or six.
How long does tankless water heater installation take in Sioux Falls?
A standard conversion takes four to six hours on install day. Add a half-day if we need to run a new gas line from the meter or cut a new vent penetration through the roof or sidewall. The permit and inspection add two to four business days to the schedule, but the work itself is a one-day job for most Sioux Falls homes.
Do I need a permit for tankless water heater installation in Sioux Falls SD?
Yes. The City of Sioux Falls requires a mechanical permit for any water heater replacement, tank or tankless, and the work must meet Uniform Plumbing Code and International Plumbing Code. We pull the permit for you and meet the inspector on site. Unpermitted installs can void your homeowner insurance and cause problems when you sell.
Related services
Related Services
Emergency Plumbing Repair
If your old tank lets go at 2 a.m., we shut off the water, contain the damage, and get you back online. We handle burst pipe and frozen pipes calls across Sioux Falls year-round, then talk through tankless options once the emergency is handled.
Plumbing Installation
Tankless installs often pair with new shut-off valves, supply lines, and fixture upgrades. Our installation crew handles the whole scope in one visit so you are not coordinating three different trades for a water heater swap.
Drain Cleaning
Hard water scale does not just kill heaters, it narrows drain lines. We hydro jet and snake the main while we are on site so your new tankless unit is not feeding a slow system. Most Sioux Falls homes need this every 18 to 24 months.Ready when you are
Book Your Tankless Water Heater Installation Sioux Falls SD
Licensed, bonded, and carrying Rheem and Navien units on the truck. Call +1 (713) 655-1138 for a same-day price on tankless water heater installation Sioux Falls SD, or book online and we will confirm your slot within the hour.
Talk with the local team
Request Tankless Water Heater Installation
Phone is the fastest way to reach us, day or night. A live dispatcher answers 24/7, takes your address and problem, and sends the nearest truck. For routine work we schedule same-day or next-day visits across Sioux Falls and Minnehaha County, including the 57103, 57106 and 57108 ZIP codes.