Thermoblock machines scale faster than boiler-based machines because the water-contact surface area relative to boiler volume is much higher. The maintenance intervals below are calibrated to this — they are shorter than what De'Longhi recommends in its user guides.
| Task | Interval | Notes |
|---|---|---|
| Portafilter and basket rinse | After every use | Warm water, 30 seconds |
| Steam wand purge and wipe | After every steam use | 3-sec purge into cloth, then wipe |
| Drip tray emptying | Every 1–2 days | Float sensor cuts pump silently when full |
| Crema enhancer disc check | Monthly | Remove, soak, clear 0.7mm hole |
| Steam tip bore clearing | Monthly | Toothpick through 1.0mm bore |
| Basket deep soak | Monthly | Cafiza solution 20 min |
| Descaling cycle | Per water hardness calculator | 1.5g citric acid per 100ml max |
| Group head gasket inspection | Every 6 months | 51mm × 40mm × 7mm spec |
| Gasket replacement | 18–24 months | Thermoblock runs cooler than boiler — longer gasket life |
A traditional boiler holds water at temperature continuously — scale deposits form slowly across a large internal surface. A thermoblock passes a small volume of water through a narrow passage on demand — the rapid temperature change from cold-to-hot and back to cold with each brew cycle creates more aggressive scale precipitation per unit volume. De'Longhi's own descaling indicators are calibrated to average use in average water — in hard water areas (above 8 GPG), the indicator fires too late. Use the Descaling Schedule Calculator and treat the indicator as a maximum, not a target.
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