A tankless water heater can outlast two tank units, but that long life is not automatic. In the Charleston area, where hard water is common, a little yearly maintenance is the difference between 20-plus years of efficient hot water and an early, expensive failure.
Why Maintenance Matters More With Hard Water
Tankless units heat water as it passes through a compact heat exchanger. Minerals in hard water scale up on that exchanger over time, which reduces efficiency, restricts flow, and eventually triggers error codes or failure. Charleston's water makes this a real, ongoing issue, not a rare one.
The Yearly Checklist
- Descale (flush) the unit. This is the big one. Circulating a descaling solution through the heat exchanger removes mineral buildup and restores efficiency. Once a year is typical; hard water may call for more often.
- Clean the inlet filter. Tankless units have a small screen that catches debris. A clogged filter chokes flow and mimics bigger problems.
- Check the venting. Confirm the vent is clear and intact, especially on gas units.
- Inspect for error codes. Note any codes the unit has thrown; they are early warnings worth addressing.
- Confirm gas and water connections. A quick check for leaks or corrosion at the connections.
Signs You Are Overdue
- Fluctuating water temperature or reduced flow
- Longer time to get hot water
- Error codes appearing
- A noticeable drop in efficiency
DIY or Pro?
Some handy owners descale their own units with a kit, but many prefer to have it done right alongside a full inspection, especially if the unit is under warranty (which may require documented maintenance). Either way, do not skip it.
Keep It Running Strong
We service and descale tankless units throughout Mount Pleasant, Charleston, and the surrounding area, and we can set you up on a simple yearly schedule so it never gets forgotten.