The Silvia water tank is small to begin with. You do use up a fair amount of water for basic things such as pulling water to warm the cups (as you have done in your video). Flushing after shots, steaming etc all add to the water level draining quite quickly.
Its normal and probably good practice to refill the water tank just before you use the machine. as for the steam wand leakage, you can try changing the metal half-o ring thats attached at the end of the steam wand. But all I do is just tighten it before I actually turn on the machine (when its cold). Bullitt explains why this is the case.
According to the Auber study on the CD which came with the kit, the Auber PID is set at 105 for a 95 deg due to where the probe is placed. And as the temp probe is installed over the cold water inlet at the top of the boiler, youll notice the temp dropping as soon as you start pulling a shot (probe is sensing cold water going into the boiler).
The PID then overshoots the temp to about 113 degrees before slowly taking it down to 105. This might take two minutes or so. However, you might be able to flush some water to hasten this process.
For those interested, I installed the Auber PID recently and heres are photos of my installation (with notes):
http://flickr.com/photos/shawnlow/sets/72157604103927428/
Pics of my Silvia post-PID are here:
http://flickr.com/photos/shawnlow/sets/72157604159446345/


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