The FZ120 Zen does what I believe ZEROtherm wanted it to do, and it does a great job. It has performance very close to that of the Nirvana, is quieter than the Nirvana, and is cheaper than the Nirvana. The Zen can be found for 39 USD plus shipping, and that's a steal. With a price like that the Zen is an inexpensive upgrade for anyone, and is almost (depending where you shop) 15-20 USD cheaper than its bigger brother, the Nirvana.
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