Tankless vs. Tank: Which Is Right for a New Braunfels Home?

Two local facts shape this choice more than any showroom pitch. New Braunfels Utilities (NBU)'s 2019 water quality report (2018 data) put hardness at 8.1 to 19.5 grains per gallon, averaging 15.1, and no NBU report since has published a figure. The City says CenterPoint supplies natural gas to many areas, but not every part of New Braunfels gets it.

So a family off Loop 337 in Veramendi, where CenterPoint gas is confirmed, and a household on a well in western River Chase can land on different answers. Here is how the two types compare, and when you want a number for your own home, get your price.

How do tankless and tank water heaters compare?

A tank water heater is cheaper to buy and simpler to swap; a tankless water heater costs more, lasts longer and never runs a tank dry. The table sets them side by side on the things a homeowner actually notices.

Tank and tankless figures are rounded from several national cost guides; how they're built.

How long does a tank or tankless water heater last?

A tank water heater typically lasts 8 to 15 years and a tankless water heater 15 to 20. The tank span runs from the manufacturers' own figures at A.O. Smith (opens in a new tab) and Rheem up to about 15 from Consumer Reports (opens in a new tab), which gives tankless at least 20.

Those are averages for maintained equipment. In water as hard as NBU's, skipped flushing or descaling pulls either type toward the short end, and no published source puts an exact figure on how much.

• Tank: the steel eventually rusts through once the anode rod is spent; that is the end of its life.
• Tankless: most parts can be replaced, so a well-kept tankless heater is repaired rather than retired.

Which costs less over its life, tank or tankless?

Nobody can say which costs less over its life without your fuel, your rates and your hot-water habits, so be wary of any promised savings figure. A tank costs less on the day it goes in; a tankless water heater costs more that day, tends to run longer and does not keep water warm all night.

• Upkeep costs a little more: a descale runs $110–$275 against $100–$225 for a tank flush.
• Extras add up: a gas line resize, a new vent or electrical work can add a few hundred dollars more.
• Payback depends on you: two showers, the dishwasher and laundry every evening lean tankless; a couple in a Downtown bungalow may never earn the difference back.

When you compare quotes, ask for the vent, any gas line work and any electrical work as separate lines. A tankless quote that bundles them hides the part that varies most from house to house.

Which handles New Braunfels hard water better?

Neither a tank nor a tankless water heater handles New Braunfels hard water well; the minerals simply damage each one in a different way. At 15.1 grains per gallon on NBU's 2019 figure, the water sits well past the U.S. Geological Survey (USGS) (opens in a new tab) "very hard" line of 180 milligrams per litre.

• In a tank: minerals settle as sediment, insulate the burner and cause the popping sound. A yearly flush, or Bradford White's habit of draining a gallon monthly, keeps it in check.
• In a tankless water heater: minerals bake onto the heat exchanger, throttle the flow and can trip an error code. Navien, Rinnai and Rheem each call for a descale at least once a year.

If the house already has a softener, a tankless heater goes longer between descales, while a tank uses up its anode rod faster. A neglected tank gets noisy and wasteful; a neglected tankless heater stops working. The hard water guide covers what a softener changes.

What if my home has no natural gas?

A home without natural gas still has three realistic paths: an electric tank, an electric tankless water heater, or propane where a supplier already delivers to the property.

• Electric tank: the simplest and least expensive of the three.
• Electric tankless: draws more current than anything else in the house and needs several large circuits; on an older panel the electrical work can cost more than the heater.
• Propane: suits some rural lots west out FM 306 or toward Canyon Lake, and only where a tank and a delivery contract already exist.

Can a tankless water heater go where my old tank sits?

A tankless water heater can often go where the old tank sits, but four things have to check out first. It hangs on a wall, burns or draws far more energy per minute than a tank, and vents differently.

1. Wall framing solid enough to carry the heater and its valves.
2. A gas line sized for the larger burner, since the pipe that fed a tank is often too small.
3. Its own vent run to the outdoors, not the old tank's flue.
4. A condensate drain on high-efficiency condensing models; ENERGY STAR gas tankless models carry a Uniform Energy Factor (UEF) of at least 0.95.

The conversion also needs a City permit, because it alters the plumbing, the gas piping and the venting. Ask whoever quotes it to name all four items on the estimate. The page on tankless water heaters covers the install itself.

Should I choose a tank or a tankless water heater?

Choose between a tank and a tankless water heater by how you live, not by the showroom.

• Pick a tank for the lowest cost now, a simple swap, hot water through a power cut on a standing-pilot model, or if you may sell in a few years.
• Pick tankless if space is tight, your hot water comes in bursts, a gas line with capacity already exists, and you will keep up the yearly descaling.
• Five or more people: Rheem's sizing guide points to a 75-gallon tank or a tankless system. Size from your busiest hour, not the bedroom count; a three-bathroom new build in Mayfair on one mid-size tankless heater is the classic mistake.
• On electric only, price an electric tank first and get the panel work quoted before choosing an electric tankless model.

Last updated: October 2, 2026