Why Tankless Water Heaters Fail Faster in San Antonio
Tankless units are sold on the promise of never running out of hot water, and that promise mostly holds true, until scale buildup starts choking the heat exchanger. This shows up differently in San Antonio than it does almost anywhere else in Texas.
The Heat Exchanger Is the Weak Point
Unlike a tank unit where sediment just sits at the bottom, a tankless system pushes water through a narrow heat exchanger every time you turn on the tap. San Antonio’s water hardness, reported by SAWS at 15 to 21 grains per gallon, deposits scale directly onto those narrow passages. Over time this restricts flow and can trigger error codes or reduce your hot water output noticeably.
Why Six Months, Not a Year
Manufacturers often recommend annual descaling as a general guideline written for average water conditions nationally. San Antonio is not average water. We recommend descaling every six months here specifically, since we regularly see units with reduced flow and error codes well before the twelve month mark when owners follow the national guideline instead of the local one.
Houston Units Face a Different Problem
Houston’s water is only moderately hard, so scale is less of an issue here. Instead, humidity accelerates corrosion on external fittings and connections, and hurricane season power outages can trip ignition faults on units with electronic controls. A tankless system in Houston still benefits from annual descaling, just for slightly different reasons than San Antonio.
Seeing an error code or reduced flow? Call (877) 560-1148 for tankless descaling and repair.