Tankless Water Heater Replacement in The Lakes
The Lakes is one of the most established communities in west-central Las Vegas, built primarily between 1988 and 2005 around the Desert Shores lake system. Homeowners who made the switch to tankless water heaters 12 to 18 years ago — when the technology was gaining traction — are now facing the reality that those first-generation units need replacing. Hard water is the primary culprit: even well-maintained tankless units in Las Vegas see heat exchanger degradation from mineral scaling, and annual descaling only slows the process. The Cooling Company handles tankless water heater replacement throughout The Lakes, Desert Shores, and Lakes Village.
Quick guidance: Tankless water heaters in The Lakes typically last 15-20 years with annual descaling. Units installed in the 2005-2012 period are hitting that window now. Signs it's time to replace: error codes that recur after service, declining hot water flow rate despite clean heat exchanger, ignition problems, or leaking from the unit body. Upgrading to a current-generation condensing tankless offers 10-15% better efficiency over units manufactured before 2015. Call (702) 567-0707 for an assessment.
What tankless replacement includes
- Old unit removal and disposal — We disconnect, remove, and dispose of the existing unit.
- Combustion and venting inspection — We assess whether existing venting (PVC or stainless concentric) is compatible with the replacement unit or requires upgrading.
- Gas line sizing verification — We confirm the supply line meets the new unit's BTU demand (typically 199,000 BTU for residential units).
- Electrical connection check — Gas tankless units need a dedicated 120V circuit for controls and ignition. We verify the circuit is properly rated.
- New unit installation and commissioning — Full installation with flow rate testing and temperature calibration.
- Descaling flush line installation — We add isolation valves and flush ports to make future annual descaling straightforward.
Why The Lakes is different for tankless replacement
The Lakes community was built around artificial lakes and mature landscaping, and that environment has plumbing implications that don't apply in newer desert communities. The man-made lake system at Desert Shores creates pockets of elevated ambient humidity — not enough to protect against hard water scaling, but enough to accelerate corrosion on the exterior bodies of tankless units mounted on exterior walls. Units installed facing north or west in shaded locations often show better body condition than those facing full afternoon sun, but the heat exchangers inside tell the same story across all exposures: hard water scaling is the limiting factor.
The Lakes homes are now 20 to 38 years old, and many have had their original copper supply lines replaced once already. The second-generation copper plumbing is typically in good shape, but fittings at tankless unit connections deserve inspection during replacement. Dezincification of brass fittings — where zinc leaches out of brass in contact with aggressive water, leaving a porous copper structure — is occasionally found at older threaded connections near water heaters in this area. We check and replace suspect fittings during replacement to prevent future leaks at the new unit connections.
The mature trees throughout The Lakes shade homes and moderate summer cooling loads, but falling leaves and debris can clog the combustion air intakes of exterior-mounted tankless units. Replacing a unit in The Lakes often means cleaning out the area, installing a mesh screen on the air intake duct termination, and advising the homeowner on seasonal cleaning. This is a small detail that prevents a service call down the road.
What to expect during the replacement visit
- Technician inspects the existing unit, venting, gas supply, and installation location.
- We identify any code updates required and provide upfront pricing for the complete job.
- Old unit is removed. Venting is inspected and replaced if it doesn't meet current code or is incompatible with the new unit.
- New unit is mounted, connected to gas, water, and electrical. Combustion is verified.
- We test hot water delivery at 2+ fixtures simultaneously and calibrate output temperature.
- Flush ports and isolation valves are installed or confirmed present for future maintenance.
Why The Lakes homeowners choose The Cooling Company
- Tankless-specific expertise — we service and replace all major brands (Navien, Rinnai, Noritz, Rheem)
- Licensed NV plumbing contractors (C-1D Plumbing #0078611)
- We advise on current-generation condensing units, which recover heat from exhaust gas for 10-15% efficiency gain over older non-condensing models
- Annual descaling programs available to protect your replacement investment
- In service since 2011 with a team carrying 55+ years of combined experience
Common Questions About Tankless Replacement in The Lakes
My tankless unit is 14 years old but still working. Should I replace it now or wait?
If it's still producing consistent hot water and passing annual descaling without significant error codes, waiting is reasonable. But schedule a diagnostic visit: a technician can assess heat exchanger condition, measure gas valve function, and identify whether you're heading toward near-term failure. Units that have been descaled annually tend to last longer than those that haven't. Units with a history of neglected maintenance at 14 years in Las Vegas water are often close to failure.
What brands do you install for replacement?
We install Navien, Rinnai, Noritz, and Rheem tankless units depending on the application. Navien and Rinnai are our most frequently specified brands for residential replacement. Both now offer condensing models with up to 0.97 UEF ratings, a meaningful efficiency improvement over units manufactured before 2015. We match the brand to your existing venting and gas configuration where possible to simplify the swap.
Do I need to upgrade my gas line when replacing with a new tankless?
Possibly. If your existing unit is a non-condensing model rated under 180,000 BTU and you're replacing with a 199,000 BTU condensing unit, the gas supply line may need upsizing. We measure gas pressure at the unit location and calculate whether the existing line can deliver the required BTU without pressure drop. If upsizing is needed, we handle that as part of the replacement project with upfront pricing.
The Lakes has older copper plumbing. Should I be concerned about fittings near the new unit?
Older brass fittings at water heater connections deserve inspection during replacement. We look for dezincification and mineral-related corrosion at threaded connections. Replacing suspect fittings during the installation visit — when everything is already disconnected — is far less expensive than addressing a fitting failure after the new unit is in place. We quote fittings replacement as an optional add-on after inspection.
Is the venting from my old tankless reusable for the new unit?
It depends on the brands involved and the venting material. Most residential tankless units use concentric PVC or stainless venting. PVC venting is compatible with condensing units only; stainless is required for non-condensing units due to higher exhaust temperatures. If you're switching from non-condensing to condensing (common when replacing older units), the PVC venting from a condensing unit actually cannot be reused for a new non-condensing installation. We assess compatibility during the initial inspection and advise accordingly.
Tankless Replacement Technical Guide for The Lakes
Condensing vs. Non-Condensing: What Changed Since 2015
Most tankless water heaters installed in The Lakes before 2015 are non-condensing models. These units exhaust combustion gases at 300-400°F and require stainless steel venting. Current-generation condensing tankless units recover heat from those exhaust gases, reducing exhaust temperature to 90-120°F — cool enough for PVC venting. The recovered heat is used to pre-warm incoming water, delivering efficiency ratings (UEF) of 0.92-0.97 versus 0.82-0.87 for older non-condensing models. Over a year, that efficiency gap saves $80-150 in gas costs for an average household. Replacement also means switching from stainless B-vent to PVC — simpler, cheaper vent runs that can be routed through smaller wall penetrations.
Hard Water and Heat Exchanger Life
The heat exchanger is the heart of a tankless water heater — finned copper or stainless tubing where combustion gases heat water on its way to the fixtures. Las Vegas water at 16-22 grains per gallon deposits calcium carbonate on the interior tube surfaces with every use. The deposits act as insulation, forcing the burner to run longer and hotter to achieve target temperature. Annual descaling (flushing with diluted white vinegar or commercial descaling solution for 30-45 minutes) dissolves the calcium. Homeowners who skip annual descaling for 3-4 consecutive years often find the heat exchanger scaled beyond what a flush can clear — at that point, replacement is the only option. We always inquire about descaling history during replacement consultations because it tells us whether the rest of the system (gas valve, flow sensor, control board) has been similarly neglected.
Flow Rate Sizing for The Lakes Households
A tankless water heater must deliver hot water to multiple simultaneous fixtures without dropping below the minimum flow rate needed to keep the burner lit (typically 0.5-0.75 GPM). For a household running a shower (1.5-2.0 GPM) and a kitchen faucet (1.5 GPM) simultaneously, you need a unit capable of 3.0-4.0 GPM temperature rise at your groundwater temperature. Las Vegas groundwater enters at 65-75°F year-round — warmer than most of the country — which means a tankless unit requires less temperature rise to hit 120°F. A 9 GPM unit rated at 35°F rise handles most 3-4 bathroom homes in The Lakes comfortably. We size based on fixture count, not just square footage.
- Flow sensor maintenance — Flow sensors trigger the burner when water movement is detected. Mineral deposits from hard water can restrict the sensor's magnetic paddle, causing burner lockouts at low flow rates. Cleaning or replacing the flow sensor is part of thorough annual maintenance and is checked during our replacement inspections.
- Ignition system inspection — Spark igniters and flame sensors degrade over time. A unit with intermittent ignition problems is close to control failure. If the ignition system on an older unit has been serviced twice in three years, it's a strong indicator that overall system life is near end.
The Lakes Neighborhood Tankless Profile
The Lakes is not one uniform neighborhood — it's a series of sub-communities with distinct development timelines and home characteristics that affect tankless replacement logistics. Lakes Estates along the eastern perimeter includes the original 1988-1992 construction, where homes are on their second or third plumbing systems and may have mixed pipe types throughout. Desert Shores lakeside homes have exterior walls facing the water — north-facing in many cases — which is actually gentler on exterior-mounted equipment but brings moisture-driven corrosion concerns. The Lakes Village section, closest to US-95, includes higher-density townhomes with shared walls and utility room constraints that require compact unit selection.
- Lakes Estates (1988-1995) — Original construction. Many have had tankless units since the early 2000s. Units in this section are frequently at 15-20 year age and either past due for replacement or approaching it. Expect to find a mix of older non-condensing models (Bradford White, A.O. Smith, Bosch) from the early tankless era.
- Desert Shores lakeside homes — Corrosion on exterior unit bodies is more pronounced here than anywhere else in The Lakes due to proximity to the man-made lake. We recommend marine-grade mounting hardware and periodic exterior inspection during annual service. Units here may benefit from a protective cover during winter months.
- The Lakes South / Lakes Village — Townhome and patio-home layouts with compact utility closets. Unit width and depth matter: we confirm clearances before ordering equipment. Condensing units with side-venting capability work well in these constrained installations.
The lakes and trees in this community — does organic debris actually affect my tankless unit?
It can. The Desert Shores lake area creates more biological debris than typical Las Vegas neighborhoods: cottonwood seeds in spring, fallen leaves in fall, and occasional algae-bearing dust from the lake surface. Combustion air intakes on exterior-mounted units can accumulate this material, restricting airflow and causing combustion inefficiency or safety lockouts. During replacement, we assess the installation orientation and add or improve intake screens where debris accumulation is a concern.
My unit has been descaled annually. Does that mean it'll last longer than average?
Annual descaling significantly extends heat exchanger life in Las Vegas — it's the single most impactful maintenance practice. Well-maintained units in The Lakes can reach 18-20 years. But descaling doesn't address control board aging, gas valve wear, or flow sensor fatigue. A 17-year-old unit that's been descaled every year is healthier than a neglected unit of the same age, but all the other components are still 17 years old. We evaluate each unit on its actual condition rather than age alone when making replacement recommendations.
Tankless Replacement Priorities for The Lakes Homes
The Lakes homeowners replacing tankless water heaters are generally upgrading from first- or second-generation non-condensing models to current-generation condensing units — a meaningful step in efficiency and simplicity. The condensing switch eliminates high-temperature stainless venting in favor of PVC, which is easier to route and less expensive to replace. The key decisions at replacement time are gas line adequacy (often the original 1/2-inch supply needs to be upped to 3/4 inch for full-output condensing units), venting configuration (most Desert Shores and Lakes Estates homes vent horizontally through the exterior wall, which works well for condensing units), and unit sizing for the household's actual peak demand. We consistently recommend installing dedicated flush ports with ball valves at this stage — they cost under $100 in parts and make future annual descaling a 45-minute job that any technician can perform without disconnecting the unit. Learn more about tankless flow rate sizing and financing your water heater upgrade.
More Ways We Help in The Lakes
We also provide tankless water heater installation, water heater replacement, and full plumbing services throughout The Lakes area. For HVAC service, see our AC repair and indoor air quality pages. Schedule service at Contact Us or call (702) 567-0707.
