Water Heater Flush Schedule Calculator
Answer a few questions and this calculator tells you roughly when to next drain or flush your water heater, then lets you download a one-click calendar reminder so you actually remember. Everything runs in your browser: no email, no sign-up, nothing leaves your device.
How this calculator decides
This tool does not invent new advice. It reuses the exact flushing schedule already published in our guide How Often Should You Flush a Water Heater? and the hardness bands from Hard Water Effects on Water Heaters. When more than one rule applies, it uses the shortest (most protective) interval, which is exactly what those guides recommend when factors stack up.
| Situation | Recommended frequency |
|---|---|
| Hard water (above 7 GPG), no softener | Every 6 months |
| Moderate water (3-7 GPG), no softener | Every 12 months |
| Soft water or whole-house softener | Every 12-18 months |
| Heavy usage (5+ people) | Every 6-9 months |
| Tank older than 8 years | Every 6 months |
| Tankless water heater | Descale every 12-18 months |
These figures are general maintenance guidance, not a guarantee about your specific tank. Always follow your manufacturer's manual, and if you hear popping or rumbling or see other signs it needs flushing, flush it sooner regardless of the date this tool gives you.
Ready to do the job?
When your reminder comes due, follow our step-by-step flushing guide or draining guide. Tankless owners can use our descaling kit picks.