Water Heater Guide · Central Texas

Tankless vs Tank Water Heater: Which Is Right for You?

A tank water heater costs less to buy and install, and it's a straight swap for the one you have. A tankless costs about 2 to 3 times as much to install, but it lasts about twice as long, uses less energy, and doesn't run out of hot water when it's sized right. If you have gas and plan to stay in the house 10+ years, tankless usually wins. If you need a replacement this week on a budget, a tank usually does.

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10-12yr
Tank Lifespan in Central Texas Water
20+yr
Tankless Lifespan With Annual Descaling
2-3x
Tankless Install Cost vs a Tank
24-34%
Tankless Energy Savings (ENERGY STAR)
Side by Side

Tankless vs Tank Water Heater

We install and repair both, from Rheem, A.O. Smith, Bradford White, Rinnai, Navien, and Noritz. Here's how they actually compare in a Central Texas house.

Tank

Tank Water Heater

Gas or electric, 40 to 80 gallons
How it worksHeats and stores water all day
Lifespan here10 - 12 years
Install costLowest
Install time4 - 6 hours for a direct swap
Hot water supplyUntil the tank runs out
Energy useHigher, from standby heat loss
SpaceAbout 5 ft tall, 20 in. wide (50 gal)
Power outageStanding-pilot gas tanks keep working
The default for a reason. Cheapest to buy, cheapest to install, and it goes right where the old one was on the lines you already have. The trade-off: it heats water you aren't using all day, and back-to-back showers can drain it.
Tankless

Tankless Water Heater

On demand, gas or electric
How it worksHeats water only as it flows
Lifespan here20+ years with annual descaling
Install costAbout 2 - 3x a tank
Install timeAdds 2 - 4 hours when converting
Hot water supplyDoesn't run out, if sized right
Energy use24 - 34% less (ENERGY STAR)
SpaceWall-mounted, carry-on suitcase size
Power outageNo hot water (needs power to fire)
Over 20 years, one tankless can outlast two tanks, and it gives you back the closet. The trade-off is the day-one cost: the gas line often needs upsizing, the venting changes, and it needs a descale every year in our hard water.

There's a third option: a heat pump (hybrid) water heater, which runs 2 to 4 times more efficiently than a standard electric tank and fits all-electric homes with garage space. We cover all three on our water heater installation page.

Making the Call

Which to Choose: Tank or Tankless?

Neither one is better for everybody. Here's how we'd decide if it were our house.

Choose a Tank If...

A tank is the right answer more often than the tankless ads would have you think.

BudgetYou want the lowest cost today.
TimingYour tank just failed and you need hot water back fast. A direct swap is usually done in a day.
HouseholdYou're a household of 1 to 4 that rarely runs out of hot water now.
PlansYou may sell in the next few years.
OutagesYou want hot water during a power outage (standing-pilot gas tank).

Choose Tankless If...

Tankless pays off for the right house. These are the signs yours is one of them.

PlansYou'll be in the house 10+ years, long enough for the lifespan and energy savings to pay back.
HouseholdYou've run out of hot water mid-shower more than once.
FuelYou have natural gas or propane. Gas tankless is the whole-home option.
SpaceYou want the closet or garage floor back.
UpkeepYou're OK with a descaling service once a year.
Local Factors

Tankless vs Tank in Central Texas

National comparisons skip the things that matter most here: our water and our weather.

Hard Water Hits Both

Central Texas water is hard. In a tank, minerals settle as sediment on the bottom, which is a big part of why tanks here last 10 to 12 years. In a tankless, scale builds on the heat exchanger. Skip the annual descaling and a unit built to last 20 years can fail far sooner.

TakeawayFlush a tank yearly, descale a tankless yearly. A water softener helps either one.

Warm Ground Water Helps Tankless

Central Texas ground water runs around 65 to 70°F most of the year, warmer than most of the country. A tankless doesn't have to heat it as far, so one quality gas unit can handle most whole-home installs here.

TakeawayTankless sizing is easier here than up north, but it still has to be sized by flow, not a sticker.

Winter Is the Real Test

When it's cold, the water coming into your house is colder too. A tank takes longer to recover, and a tankless has to work harder to hit the same temperature at the same flow. That's why a tank that was fine in August runs out in January, and why we size tankless for winter, not summer.

TakeawayIf you're already running short on hot water in fall, winter will be worse.

Power Outages and Freezes

A gas tankless needs electricity for its igniter and fan, so no power means no hot water. A gas tank with a standing pilot keeps delivering stored hot water through an outage. If your area loses power often in winter storms, weigh that.

TakeawayRarely a deal-breaker, but worth knowing before you commit.
Switching Over

Switching From a Tank to Tankless

It isn't always a direct swap. These are the checks we run before we quote a conversion, so there are no surprise change orders.

Tank failed? You don't have to decide today

If your tank just quit on a cold morning, a same-type replacement gets hot water back in about a day. If you've been thinking about tankless, tell us when you call and we'll check your gas line, venting, and electrical while we're there.

Either way, we pull the permit and handle the inspection. Water heater replacement is a mechanical permit in most of Williamson and Burnet counties.

Need a water heater before it gets cold? Call (512) 200-1740. Most installs are done in a single day, anywhere from Liberty Hill to Burnet.
1

Gas line size

A standard 40 to 50 gallon gas tank runs on a 1/2-inch line. A whole-home tankless usually needs 3/4-inch or larger, because it pulls more gas in short bursts. If yours needs upsizing, it's in the quote.

2

Venting path

Condensing tankless units vent through PVC. Non-condensing units need stainless steel. Either way the old tank vent usually can't be reused as-is.

3

Power and condensate

A gas tankless needs a 120V outlet nearby, and condensing units need a drain for condensate. Electric tankless units often need a dedicated 240V circuit and may need a panel check.

4

Sizing by flow

We add up the fixtures you'd run at the same time. A shower runs about 2 to 2.5 gallons per minute, so a 3-bathroom home running two showers and a sink needs roughly 6 to 7 GPM, plus margin.

Common Questions

Tankless vs Tank Questions

Is a tankless water heater worth it?
For a household that stays put 10+ years, has gas, and uses a lot of hot water, usually yes. It lasts about twice as long as a tank and uses 24 to 34% less energy by ENERGY STAR's numbers. For a smaller household on a budget, or if you may move soon, a new tank is often the better value.
How long does a tank water heater last compared to tankless?
In Central Texas water, a tank typically lasts 10 to 12 years. A tankless lasts 20+ years with annual descaling. Skip the descaling and a tankless can fail years early from scale on the heat exchanger.
Does a tankless water heater ever run out of hot water?
Not if it's sized right for how many fixtures you run at once. Undersized, it can't keep up and the water goes lukewarm. Many standard models also have a "cold-water sandwich": turn the shower off and back on and you get a short burst of cold while the unit re-fires. Premium units with a built-in buffer tank and recirculation, like the Navien NPE-A2 series, solve that.
Can I replace my tank with a tankless?
Usually, yes. Plan on the gas line, venting, and a power outlet being part of the job. A tank-to-tankless conversion adds about 2 to 4 hours over a straight tank swap. We check all of it before we quote, so the price doesn't change on install day. See our tankless water heater page for sizing and brands.
What about an electric tankless water heater?
Electric tankless is great for point-of-use: a bathroom addition, a casita, a shop sink. As a whole-home heater it's workable for small households, but the flow limits are real, and most units need a dedicated 240V circuit with serious amperage. For whole-home, gas tankless or an electric heat pump water heater is usually the better fit.
My water heater stopped working. Should I repair it or replace it?
A failed element, thermostat, or gas valve on a younger tank is usually worth repairing, often the same day. A tank that's leaking from the tank itself, or one past 10 to 12 years, is usually time to replace. We'll tell you straight. Start with our water heater repair page.
Do you install water heaters near me?
If you're in or around Liberty Hill, yes. We install and repair tank and tankless water heaters across Leander, Georgetown, Cedar Park, Round Rock, Burnet, and Bertram, with the permit pulled on every install.

Need a Water Heater
Before It Gets Cold?

Tank or tankless, most installs done in a single day, permit pulled, flat-rate quote up front. Call or request service online.

(512) 200-1740 Request Service →