How often should a tankless water heater be descaled?
Around here: once a year. Manufacturers say every one to two years depending on your water, and Midlands water is hard enough that yearly is the safe bet. If your unit has never been descaled, the right time is now. Scale damage adds up quietly.
Why the interval matters
Every gallon of hot water leaves a little mineral behind inside the unit. Year one, it costs you a little efficiency. By year two or three the unit starts telling on itself: error codes, popping and rumbling, slower hot water, temperature swings. An annual flush clears it easily. Years of buildup is a much harder job, and some of the damage from waiting doesn’t reverse.
What a descale visit looks like
About an hour. We hook a pump to the unit’s isolation valves, circulate descaling solution through it until it runs clean, clean the inlet filter, and give the whole unit a quick once-over while we’re standing there. You’ve got hot water again that afternoon. No isolation valves on your unit? We can add them, and every descale after that is simple.
Can you do it yourself? Honestly, yes.
Descale kits exist. If you’ve got isolation valves, a pump, and a free Saturday, it’s a doable job. Plenty of our customers would just rather not, which is why we run descales on an annual reminder cycle: we track the date, we call you, and it gets done before the unit starts complaining.
A note on well water
On a well, which is common out toward Lexington and Chapin, the right interval might be shorter than a year. Depends what’s in your water. Ask us and we’ll tell you straight.
Quick answers
Want it handled automatically? Join the annual descale reminder list. We track the date so you don’t have to.