La Marzocco Water Tank – Lower Basin Only for GS3 – Genuine 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 seeing it, as long as it does its job.
The GS3 can be plumbed in directly or run with the built-in 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 water routing deserves more attention than you'd think
Water makes up over 90 percent of espresso, and the ideal mineral content sits around 50 to 100 mg/l – values that only arrive reliably if 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's visible on the surface.
The genuine replacement brings the GS3's water routing back to its original, watertight state.
At a glance
| Compatible with |
La Marzocco GS3 (built-in 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 |
Who it's for
For everyone running a GS3 on tank operation whose lower basin shows cracks, leaks, or visible signs of age. If the upper part of the tank is still in good shape, this targeted spare part means you don't have to replace the whole system.
Goes well with
Anyone thinking about the GS3's water will find more on our page Composing your own coffee water with deeper background. For maintaining the machine, our cleaning products are a good fit, and for dosing, our coffee scales from Normcore to Acaia. More on the GS3 can be found in our La Marzocco Collection.
Frequently asked questions
Do I need to replace the whole tank if only the lower basin is damaged?
No, this is 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 concerns the tank version.
How do I know 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 Zurich (Hagenholzstrasse 50b) you can experience the genuine spare part live.
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 who wants to discover a fruity experience: Wild Peach, lively and always a discovery. Our recommendation from the roastery, one of many.
