Ebo Jager heaters.

[Tinman]

We have been hearing rave reviews of the new Smart Heaters by Rena:
http://www.charterhouse-aquatics.co.uk/ ... 9_270.html As well as being unbreakable and supposedly very accurate, they can be plumbed into the external filter tubing with a special connection kit.

I have seen these but have concerns over the growth of algea inside the area about the heater where the water flows and that causing a loss of cooling and a short lifespan for the heater. I don't like the idea of not seeing the glass with everything "inside" the flow tube.
Am I just thinking old school here?
It seems it would not last with food and all going into it and causing problems by plugging or fouling around the heater itself.
Is this the heater I am thinking of? It looks to let water flow around it inside a housing like a UV light or is this different. I like the idea of a warning light .That is a novel idea

[Diana]

I thought that Rena heater could be attached to the inside tubing, the inlet, where water from the tank enters the filter. Heater is really still in the tank, but the water movement as it flows into the intake then passes right by the heater.
I do understand the concerns about debris getting hung up there, possibly algae growing on it, I have a little algae growing in the bright light near the top of some tanks, and would not want to have this particular stuff blocking the path that the water is supposed to follow to get into the filter! This stuff is almost like moss, thick and talk about turbulance! It would really slow the water!

I know there are several models of in-line heaters that are actually external to the tank, Hydor is one such name. From what I have heard it is a good product. I am pretty sure this one is built along the lines of a UV light: Wider diameter tube encloses the heater, and it is plumbed into the tubing of a canister filter.