Quote:
Originally Posted by Ducay
freshly boiled water in the preheated unit delivers the optimal brew temp (195-205') Any other cheapo machines just can't get you consistent temperatures and pressure (9bars, not 15) needed for espresso.
|
From nespresso:
- A good espresso/coffee must also be prepared at a precisely calibrated temperature. Too hot and the coffee will burn, too low and the coffee aromas will not be optimally extracted. Accordingly, Nespresso machines feature a thermoblock: a high precision system controlled by a thermostat to regulate the water temperature. This element ensures that the water is brought to an ideal temperature of 90C (195F), guaranteeing the espresso’s taste and the formation of crema.
- The Nespresso extraction system operates only once the ideal water pressure of 11 bars is reached inside the capsule. Then the capsule is perforated at several points by the exclusive, built-in opening and filtration system. A jet of instantly heated fresh water penetrates the capsule and flows through all of the ground coffee at once, allowing Nespresso’s superior extraction of all the precious, volatile coffee aromas at optimal pressure to produce incomparable body and taste enhanced by smooth crema.
The 11-15 PSI is hitting the grounds with about 8.5-9 per Nespresso, once the pressure loss from the nozzlehead is factored in.
This is why I love Nespresso, other than the lack of bean variety. if I could get the market-wide selection of beans, I'd be in heaven.
I get a perfect 8.5-9 bar across the beans (11 bar at the nozzlehead), allowing the water to flow through the beans and not over, which happens at too high a pressure. I also get a electronically controlled 195F hit of water at the beans. Love it.