Why so many Round Rock tanks are due
Teravista, Forest Creek, Behrens Ranch and the other neighborhoods that filled in after Dell arrived were mostly finished with standard builder-grade tanks, often set on attic platforms. On Round Rock's hard lake and well water, those tanks commonly run eight to eleven years before the lining gives out. A house built in 2014 with its original heater is already living on borrowed time.
When a five-year-old Round Rock tank loses its igniter or thermocouple, fix it. Replacement is the better choice when you notice:
- A stain on the ceiling under the attic platform or water standing in the pan.
- Gritty sediment in faucet screens paired with a tank that rumbles while heating.
- Rust at the fittings on top or along the seam at the bottom.
- A gas valve or burner problem on a tank past ten years, where the repair would cost a third or more of a new heater.
- Showers that run cool sooner now that the household has grown or added a bathroom.
Limestone hardness and what it does inside a tank are covered in our hard water guide.
Round Rock installed prices
| New heater | Installed range in Round Rock | Notes |
|---|---|---|
| 40 gallon gas tank | $1,500–$2,900 | Garage swap in a 1980s ranch |
| 50 gallon gas tank | $1,700–$3,800 | Attic installs at the top |
| 50 gallon electric tank | $1,400–$2,800 | Wiring and breaker checked |
| 75 gallon gas tank | $2,900–$5,000 | Larger vent and gas supply |
| Power-vent gas tank | $3,000–$5,200 | Sidewall vent, outlet required |
| Tankless gas, whole house | $3,500–$6,400 | Gas line upsizing common |
| Heat pump water heater | $3,300–$5,800 | Garage location works best |
| Permit, haul-away, expansion tank, pan | $175–$700 | Usually bundled |
The same Central Texas crews work Round Rock and north Austin, so prices track closely. A single-story brick home near Old Settlers Park with the tank in the garage is the easy case. A two-story with a narrow pull-down ladder, a July attic and a pan that needs rerouting away from the AC condensate line is the expensive one.
Sizing for a 55 degree January inlet
Lake Georgetown and Lake Travis water reaches Round Rock taps in the mid 50s by January, leaving a 65 degree climb to a 120°F setting. That is a heavier lift than in San Antonio, and it is the season when an undersized tank gets noticed. Size for January, not for August, when the inlet climbs into the 80s and almost any heater keeps up.
For tanks, compare first-hour ratings. Two to three people usually do well with a 40 gallon gas tank in the 65 to 75 gallon first-hour range. Four or five people in a typical Paloma Lake or Teravista two-story generally need a 50 gallon gas unit with a first-hour number of 80 or more. Homes with a large garden tub or a pool bath should consider 75 gallons or two smaller tanks.
At that 65 degree January rise, a 199,000 BTU tankless burner on Atmos gas yields about five and a half to six gallons a minute, enough for two showers running together. Larger households may want two units linked, or one high-output model, along with a gas meter and line that can feed it at full rate.
Gas, electric or heat pump in Williamson County
Atmos Energy delivers natural gas across most of Round Rock, and electricity comes over Oncor's lines in most neighborhoods, with Pedernales Electric Cooperative serving some areas on the edges. That gives most homeowners a choice between gas and electric when the old tank fails.
A gas tank is the fastest like-for-like replacement and the one most likely to be finished the same day. Tankless is popular in newer homes for the space it frees in the attic, but Round Rock's hard water means yearly descaling, so ask for isolation valves and consider a softener at the same time.
Heat pump water heaters make sense where the heater sits in a garage, which stays warm much of the year here. They are a poor fit for tight attic platforms, where airflow and condensate drainage are harder. Utilities in the area have offered efficiency rebates at times, so check with your installer before you buy.
What the city inspector checks
Inside city limits, replacements are permitted through Round Rock's building inspection division, and the plumber should pull the permit and meet the inspector. Brushy Creek addresses and other spots outside the city answer to Williamson County or their MUD instead. Confirm the plumber's Texas license on the state's search before the work begins.
- Vent pipe suited to the replacement and terminating correctly above the roof; condensing and power-vent models use sealed plastic or stainless runs instead.
- Gas supply with a new connector, sediment trap and accessible shutoff, leak tested.
- Relief valve discharge piped full size to the outdoors or another approved spot.
- Expansion tank wherever the meter or a pressure-reducing valve closes the system.
- Attic pan with its own drain to daylight, kept separate from a clogged AC condensate line, plus a walkway, platform, light and outlet.
- An 18 inch platform under any gas heater in a Round Rock garage, unless the inspector accepts an FVIR-listed model sitting on the slab.
- Haul-away of the old tank.
How long a Round Rock replacement takes
Expect a two to three hour visit for a garage tank, and because Austin-area supply houses stock the common sizes, a Round Rock call before lunch often gets a new heater the same day. Attic replacements typically take four to five hours because the old tank must be drained, lowered by two people and the pan reset. Tank-to-tankless conversions with new venting and gas piping generally take most of a day.
Older Old Town homes add their own complications: heaters in tight porch closets, old flue runs that need replacing and doorways too narrow for a modern insulated tank. In newer subdivisions the usual surprises are pans that never drained properly and water-damaged platform decking that has to be replaced before the new heater goes up.
If your heater is in the attic, ask about moving it to the garage. Gas and vent routing do not always cooperate, but when they do, a garage location means no future tank can soak a Teravista ceiling.
Replacement near Round Rock
We also install water heaters in Georgetown, Pflugerville, Hutto, Cedar Park and Brushy Creek. Each has its own permit office or district rules. Upkeep and repair advice for Round Rock's lake water lives on our water heater help in Round Rock page; /services/water-heater-replacement/ walks through a replacement visit.
Questions people ask
What will a new water heater run me in Round Rock?
Standard 40 or 50 gallon gas tanks usually cost about $1,500 to $3,800 installed, with attic installs at the top. Tankless installs run around $3,500 to $6,400.
How long do water heaters last in Round Rock?
Often eight to eleven years on the city's hard water. A softener plus a yearly flush tends to add years.
Can my attic water heater be moved to the garage?
Often, if gas, venting and water lines can be rerouted. It costs more once but removes the risk of a leak through the ceiling.
Is a permit required for a Round Rock water heater swap?
Yes, inside city limits. The plumber pulls it through the city's building inspection division. Brushy Creek follows county or district rules.
How big a tankless unit does a Round Rock home need?
Size for the mid 50s winter inlet. A 199,000 BTU gas unit gives roughly five and a half to six gallons per minute, enough for most families of four.
Can a Round Rock water heater be replaced the same day?
Usually, for a standard gas or electric tank. Attic jobs may run into the afternoon, and tankless conversions often need a scheduled full day.