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Glass is a good thermal conductor (better than plastic). One can also visually inspect the inside with a glass housing. The presence of water inside the glass housing gives an early warning to a bad heater. Sure, the heater could work for another 2 to 3 years, but why take this risk for a $25 item?

The original EJ LZ line is probably the best heater made to date. The newer TZ line adds adjustable temperature knob, which could lead to premature leakage. I suspect the bi-metallic sensor assembly is also cheaper, resulting in unstable temperature control.

Hagen has a new line of electronic heaters...Fluval Tronics. It's probably the same as the original Hagen Tronics, with minor tweaks.
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