By pump

Freeze dryers by vacuum pump

The pump is the part you will maintain. An oil-sealed pump wants its oil changed or filtered every few batches; an oil-free pump wants nothing but costs more; some units ship with no pump at all and leave the choice to you.

Oil

26 units · 8 lb–82.5 lb per batch

None

8 units · 21.2 lb–21.2 lb per batch

Oil-free

2 units · 12 lb–80 lb per batch

Only groups with two or more units get a page — one unit is not a comparison.