I’m not a fan of plastic leaching into liquids that I consume, or things that can’t be run through the dishwasher, which makes me, by definition, a sworn enemy of the Rancilio Silvia water reservoir.

Here is the OEM reservoir which is confirmed by Rancilio to be hand-wash only

A close-up view reveals the tragic flaw: a completely unnecessary bump that prevents normal hand-washing with a brush or sponge. Since this is not dishwasher safe you’ll have to go to extreme lengths to clean it properly.

The reservoir is suspended from the roof of the enclosure but there is a shelf inside that you could place an alternative reservoir in. The dimensions of the reservoir area are 3″ x 7.5″ x 7.5″. While nobody makes a Rancilio-specific replacement reservoir, florists carry rectangular glass vases which would work just fine. I found one that was 2.5″ x 6″ x 6″ which was smaller but acceptable as it still holds 2 pints and has enough room around it to easily pull it out for cleaning.