Here's a load of marketing bollox to go with your rant:RapidCoffee wrote:<rant>
Absolutely correct. And regardless of whether you choose to leave the machine on 24/7 or turn it off at night, boiler insulation is a no-brainer. Uninsulated boilers waste energy, pure and simple. Insulating the boiler should not be the responsibility of the consumer; espresso machines should ship with insulated boilers. Unfortunately, most manufacturers (with the notable exception of Quick Mill) don't agree.
a) Insulating the boiler would disrupt the natural airflow inside the espresso machine. With an un-insulated boiler, heat will rise normally upwards not only to pre-heat the cups, but at the same time create an upward draft to keep the bottom portion, where the electrical components located, cooler. When the boiler is insulated, less draft is created inside, heat build up increases due to more stagnant airflow. This will ultimately affect the electrical components, such as the smaller pressurestats and brain units (especially when located very close to the boiler).
b) Even with the boiler walls insulated, the stagnation of heat will still affect the water reservoir, and
c) For boiler insulation to become completely effective in not allowing heat build up against the reservoir, all the tubing inside should be insulated and an electrical cup warming plate should be added. If insulation is added to the wall between the reservoir and boiler, this will only increase the temperature of the stagnated airflow.
These are the reasons why many manufacturers do not insulate their internal boilers.