Miele hasn't published a limit our check can use for this machine yet, so the check can't give it a result. Whatever the maker does say is quoted below.
Will my water work with this machine?
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What the maker says this machine needs from its water. This is machine care, not drinking-water advice.
From Miele's guidance for this model.
Water type
“Carbonated water leaves too much limescale in the coffee machine.”
Miele Operating Instructions, Countertop Coffee Machine CM 5300, CM 5310, CM 5410, CM 5510, CM 5710, en-US, M.-Nr. 11 675 681. Source (opens in a new tab), saved October 29, 2026.
Water type
“Do not use sparkling water.”
Miele Operating Instructions, Countertop Coffee Machine CM 5300, CM 5310, CM 5410, CM 5510, CM 5710, en-US, M.-Nr. 11 675 681. Source (opens in a new tab), saved October 29, 2026.
Hardness setting
“The water hardness level is set to 3 at the factory.”
Miele Operating Instructions, Countertop Coffee Machine CM 5300, CM 5310, CM 5410, CM 5510, CM 5710, en-US, M.-Nr. 11 675 681. Source (opens in a new tab), saved October 29, 2026.
Hardness setting
“The appliance has 4 programmable hardness levels: °dH gr/gal ppm (mg/l CaCO3) Set- ting* 0–8.4 0–8.7 0–150 Soft 1 8.4–14 8.7–14.6 150–250 Medium 2 14–21 14.6–21.9 250–375 Hard 3 > 21 > 21.9 > 375 Very hard 4”
Miele Operating Instructions, Countertop Coffee Machine CM 5300, CM 5310, CM 5410, CM 5510, CM 5710, en-US, M.-Nr. 11 675 681, Setting the water hardness. Source (opens in a new tab), saved October 29, 2026.
