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I like good espresso coffee and I've owned and used a Pavoni Europiccola lever machine for ages. Not surprisingly there are fora and Facebook groups all over the place, containing all levels of 'knowledge' about science and coffee making.
There are two criteria which affect the coffee: temperature of the water and pressure of the water being forced through the grounds (set by the force on the lever, its length and the area of the piston). Also, to get good foam, the boiler pressure needs to be appropriate.
The machine has a pressurised boiler with an electrical element and a 'pressurestat', which can be set to a pressure of choice. The recommendation is to purge air from the boiler through the steam pipe (for frothing) to get the correct temperature of the water. It figures that the more air there is in the boiler, the lower will be the partial pressure of the steam and the lower will be the temperature of the water. Hence the use of the term 'false pressure'. I have googled this term and pretty much the only responses I get are from coffee nerds (me too sir).
So - why not use a thermostat, if you want an appropriate temperature? I would be very surprised if there are no other coffee aficionados in PF so what's the proper, informed, opinion of the topic?
There are two criteria which affect the coffee: temperature of the water and pressure of the water being forced through the grounds (set by the force on the lever, its length and the area of the piston). Also, to get good foam, the boiler pressure needs to be appropriate.
The machine has a pressurised boiler with an electrical element and a 'pressurestat', which can be set to a pressure of choice. The recommendation is to purge air from the boiler through the steam pipe (for frothing) to get the correct temperature of the water. It figures that the more air there is in the boiler, the lower will be the partial pressure of the steam and the lower will be the temperature of the water. Hence the use of the term 'false pressure'. I have googled this term and pretty much the only responses I get are from coffee nerds (me too sir).
So - why not use a thermostat, if you want an appropriate temperature? I would be very surprised if there are no other coffee aficionados in PF so what's the proper, informed, opinion of the topic?