Data Sheet

Bella Barista
Nene Court, The Embankment,Wellingborough, Northants, NN8 1LD
Tel: [phone]
e-mail: [e-mail]
© Bella Barista Page 10 of 12
How it works
The diagram shows a simplified (but essentially accurate) diagram of the Brewtus II twin
boiler system. The pump keeps the steam boiler (which also provides hot water) about
80% filled with water that is heated and kept at a pressure of 1.0 bar (about 15 psi). The
temperature of this water is above boiling point and has an area of steam above (similar to a
pressure cooker).
Steam - The pipe for the steam wand is at the top of the boiler (in the steam area) as the
steam tap is opened, steam is forced through the steam pipe and as the pressure drops more
of the water instantly flashes to steam, giving a continuous supply.
Hot Water - The pipe for the hot water tap is at the bottom of the boiler. As the hot water tap
is opened, steam pressure forces the hot water from the boiler through the pipe and out of the
hot water outlet.
Coffee Brew Water - Coffee brew water for the group is fed from the second “brew water
boiler”. You can see a feed to this “brew water boiler” coming from the “steam boiler”. They
ingeniously pass the cold water from the tank, through a small Heat Exchanger in the steam
boiler, to warm it up before it goes into the brew water boiler. This is clever because it
prevents the brew water temperature dropping when making coffee, unlike some other
machines.