Tankless water heaters have become increasingly popular in Central Texas, and for good reason — they deliver hot water on demand, last significantly longer than tank units, and can reduce energy costs by 24–34% compared to conventional storage heaters according to the U.S. Department of Energy. But the Highland Lakes region’s hard water creates some important considerations before you make the switch.
The Case For Going Tankless
The most obvious benefit is endless hot water. A tankless unit heats water as it flows through the unit rather than maintaining a stored supply, so you’ll never run out during a long shower or back-to-back loads of laundry. Units are also significantly more compact — most wall-mount units take up a fraction of the space of a 50-gallon tank.
Lifespan is another major advantage. A quality tankless unit, properly maintained, should last 20+ years. Conventional tank heaters in the Highland Lakes typically last 6–10 years due to hard water sediment buildup.
The Hard Water Problem
Here’s the catch: the same hard water that destroys conventional tank heaters is equally hard on tankless units — and the failure mode is more expensive. Scale deposits form on the heat exchanger, reducing efficiency and eventually cracking the exchanger under thermal stress. A heat exchanger replacement on a tankless unit can cost $500–$800 in parts alone.
The solution is annual descaling (flushing the heat exchanger with a food-grade acid solution) and — ideally — installing a whole-house water softener upstream of the unit. Without one or both of these measures, a tankless water heater in the Highland Lakes will underperform and fail prematurely.
Gas vs. Electric in Central Texas
Most Central Texas homes with natural gas service will see better performance and lower operating costs with a gas tankless unit. Electric tankless heaters require significant electrical capacity — often 200 amps or more — and may require a panel upgrade in older homes. If you’re on propane, a gas tankless unit is still typically the better choice, though propane costs should be factored into your ROI calculation.
Our Recommendation
For most Highland Lakes homeowners, a tankless water heater is a worthwhile investment — provided it’s paired with a water softener and a committed maintenance schedule. We install and service Rinnai and Navien tankless units and can assess whether your home’s gas line, venting, and water quality are ready for the upgrade. Call us at (325) 248-1800 to schedule a free consultation.