by phreich on Sun Jun 26, 2011 4:00 pm
I also agree with the responses indicating that it isn't really necessary to drain the boiler this time of year because it won't freeze when shipped via ground shipping, but a good point was raised about possible leakage if the carton is tipped on it's side or back via a vacuum breaker valve.
HOWEVER, just to make sure people are aware, if you are planning on shipping an espresso machine of any sort during months when mountain passes could be below freezing temperatures, you do need to drain the boiler. I mention the mountain passes, because -- you need to be concerned about the temperatures in the locations the machine will be traveling through -- not just the departure location and the destination. Freezing damage could occur anywhere along the way -- ground transportation is not heated. Think worst case scenario temperature-wise and plan accordingly.
As suggested, if the boiler doesn't have a drain in the bottom, you can remove the boiler safety valve on the top of the boiler and either siphon out the boiler or turn the machine upside down and let it drain out (after having removed all loose parts like drip pans, cup warmer trays, emptying supply tanks from pour-over machines, etc...). If you don't drain the boiler and it freezes, you will wind up with either a very expensive repair (boiler and any other parts that may have been frozen), or a worthless machine because the repairs are more expensive than the machine is worth.
In addition to being concerned about the boiler freezing, a person shipping a machine would be prudent to drain all lines by opening up the appropriate lines and draining them, or blowing them out with low-pressure compressed air. I have seen a number of ruined dosimeters on automatic machines due to freezing, as well as some burst tubing.
Bottom line, if shipping during potentially freezing weather in the high passes, and you don't feel comfortable about draining the machine yourself, take it into a professional or truly experienced amateur friend and have them prep it for shipping.
One last thought -- this also applies to machines being stored. I recently ran into a beautiful donated but ruined automatic two group machine because the church deacon had stored it in an outdoor shed over the winter. The machine basically was just worth the metal salvage value and whatever parts could be resold like the motor, electronics, portafilters, etc. When storing a machine, it is best to store it in a heated space -- then you don't have to worry about freezing.
I hope this helps,
Philip