Not inline externaly, but the one that I am the most excited about is Renas new smart heater. The entire heater is solid black and made of some kind of really hard plastic resin. No glass. Completly unbreakable. It is cool to the touch. It has a flashing LED alarm light that goes off if the temp goes plus or minus 5 degrees from the set point. It is extremely accurate, from 63 to 93F.
It can also snap onto the Rena smartfilter, an HOB filter, and become the heated intake tube of the filter! Very cool.
