Navien Tankless Water Heaters in Apex

You're in the middle of a shower and the hot water cuts out because someone started the dishwasher. Or you're the third person to shower in the morning and there's nothing left but lukewarm water. That's the reality of a tank water heater running out of capacity — and it's the number one reason Triangle homeowners ask us about going tankless. A tankless unit heats water on demand, so the supply doesn't run out. As long as water is flowing through the unit, it's getting heated. No tank to drain, no recovery time, no cold surprises.

The energy savings matter too — about $100 to $150 per year compared to a traditional tank unit — but that number alone doesn't tell you whether going tankless is the right move for your household. The installed cost runs $3,500 to $5,500 for a whole-house gas tankless unit versus $1,500 to $2,500 for a standard tank water heater. Simple math puts the payback period at 8-12 years on energy savings alone. Where tankless pulls ahead is lifespan: 20+ years for tankless versus 10-15 for a tank. When you factor in replacing a tank heater twice over the same period, tankless often wins on total cost of ownership.

The energy savings come from eliminating standby heat loss. A tank water heater keeps 40-50 gallons of water hot around the clock, even at 3 a.m. when nobody needs it. That constant reheating accounts for 20-30% of its energy use. A tankless unit sits idle until you turn on a hot water tap. Water flows through a heat exchanger, gets heated instantly, and comes out hot. When you turn the tap off, the unit shuts down. You only burn gas or electricity when you're actually using hot water.

Who benefits most from going tankless? Households that use a lot of hot water. If you have four or five people taking showers every morning, running the dishwasher nightly, and doing multiple loads of laundry per week, a tankless unit delivers endless hot water without the recovery time a tank needs between heavy uses. No more cold showers because someone ran the dishwasher. Also, if you're staying in your home for 10+ years, the longer lifespan and energy savings have time to pay back the higher upfront cost.

Who should probably stick with a tank? Smaller households — one or two people — where hot water demand is modest and a 40-gallon tank handles everything without breaking a sweat. The lower upfront cost makes a tank the more practical choice. Also, homes where the installation logistics would be expensive. If your gas line, electrical, and venting would all need upgrades, the installation cost can push a tankless project to $6,000 or more, stretching the payback well beyond a decade.

Here's something that gets overlooked: simultaneous demand. A tankless unit has a maximum flow rate, measured in gallons per minute. A typical whole-house gas unit delivers 8-10 GPM in warm climates. But that rating drops when incoming water is colder. In the Triangle, our incoming water temperature sits around 55-65°F depending on the season. During January, your tankless unit might deliver 5-6 GPM at the desired output temperature. That's enough for two showers running at the same time, or a shower plus a faucet. But if you're trying to run two showers, the dishwasher, and a washing machine simultaneously, even a large tankless unit may not keep up. The fix is either staggering usage or installing a second unit — which obviously adds cost.

Installation considerations make or break a tankless project. Gas tankless water heaters need a bigger gas line than tank models. Most tank water heaters run on a 1/2-inch gas line. A tankless unit typically needs 3/4-inch, and some larger models need 1-inch. Many older homes in Raleigh, Cary, and Durham have gas lines that were sized only for the original appliances. Running a new, larger gas line from the meter to the unit adds $300-$800 to the project. Our techs evaluate this during the free in-home estimate so there are no surprises on installation day.

Venting is the other big installation factor. Tank water heaters use a natural draft B-vent that goes up through the roof. Most tankless units use a powered direct-vent setup with stainless steel or PVC piping that exits through an exterior wall. This is actually easier in some cases — especially if the water heater is located on an exterior wall. But if your current tank is in the center of the house or in a closet with no exterior wall access, routing the vent adds complexity and cost.

Maintenance is where a lot of tankless owners get burned. These units need annual flushing to remove mineral scale from the heat exchanger. Wake County water hardness ranges from 3-7 grains per gallon. That's moderate, not extreme, but it's enough to build up scale over time. Skipping the annual flush is the single fastest way to shorten the life of your tankless unit. Scale buildup reduces efficiency, triggers error codes, and can permanently damage the heat exchanger. A professional flush takes about an hour and costs $150-$200, or you can do it yourself with a pump and food-grade vinegar. Either way, put it on your calendar every year. Some manufacturers void the warranty if you can't show proof of regular descaling.

Tankless units also have an inlet filter screen that catches debris from the water supply. It takes 30 seconds to clean and should be checked every few months. Most homeowners forget this exists until the unit throws a low-flow error.

We install both tank and tankless water heaters across Apex, Cary, Raleigh, Durham, Holly Springs, and Fuquay-Varina. Same-day installation is available for many tank replacements. Tankless installations typically take a full day, especially if gas line or venting upgrades are involved. We provide free in-home estimates where we evaluate your home's plumbing, gas supply, and hot water usage to give you an honest recommendation. Financing is available for homeowners who want to go tankless without the full upfront hit. Element Service Group is veteran-owned with over 700 five-star reviews. We'll tell you straight whether tankless makes financial sense for your household or whether a quality tank heater is the smarter play.