La Marzocco Water Tank – Lower Basin Only for GS3 – Original Spare Part
3.5 litres of water wait quietly inside the GS3, ready for the next shot – and more than 90 percent of what later ends up in the cup is exactly this water. The tank's lower basin carries this volume, day after day, without you ever laying eyes on it, as long as it's doing its job.
The GS3 can be plumbed in directly or run with the integrated tank – for everyone who has chosen the latter, this lower basin is the foundation of the water system. Only the lower part, not the complete tank: a targeted replacement for exactly the spot most likely to show signs of age.
Why the water system deserves more attention than you'd think
Water makes up more than 90 percent of an espresso, and the ideal mineral content sits around 50 to 100 mg/l – values that only arrive reliably when the machine's entire water system is sealed and intact. A lower basin showing fine cracks or no longer sitting cleanly can affect this whole cycle long before it becomes visible on the surface.
The original replacement brings the GS3's water system back to its original, sealed state.
At a Glance
| Compatible with |
La Marzocco GS3 (integrated water tank) |
| Version |
Lower basin only, not the complete tank |
| Tank volume (GS3, total) |
3.5 litres |
| Material |
Plastic, food-safe |
| Origin |
La Marzocco, Florence, Italy |
| Part number |
A04449 |
Who it's for
For anyone with a GS3 running on tank mode whose lower basin shows cracks, leaks, or visible signs of age. If the upper part of the tank is still in good condition, this targeted spare part means you don't have to replace the whole system.
A good match
Anyone diving into the GS3's water will find in-depth background on our Composing your own coffee water page. For caring for the machine, our cleaning products are a great match, and for dosing, our coffee scales from Normcore to Acaia. You'll find more around the GS3 in our La Marzocco collection.
Frequently Asked Questions
Do I need to replace the whole tank if only the lower basin is damaged?
No, that's exactly why this spare part exists separately for the lower basin.
Does this also work if my GS3 is plumbed in directly?
The GS3 can run either with a tank or plumbed in directly. This spare part is for the tank version.
How can I tell the basin needs replacing?
Visible cracks, moisture under the machine, or a tank that no longer sits properly are the clearest signs.
Can I see the product before buying?
Yes, in our showrooms in Bern (Gerberngasse 44) and Zürich (Hagenholzstrasse 50b) you can experience the original spare part live.
How quickly will the spare part reach me?
Delivery takes place within 2–4 working days, across Switzerland and to Liechtenstein.
The Roastery Tip
Good water is the foundation, good coffee the reward. Our main recommendation: Cozy Chocolate and Nutty Delight, dense, aromatic, full-bodied. For maximum body with no acidity at all: Very Nutty. For anyone wanting to discover a fruity experience: Wild Peach, vivid and always a discovery. Our recommendation from the roastery, one of many.
