Tubes, now I got ya.
Mine is deep fill. One big mattress. I do not care for the tube style ones.
I have a fairly nice heater that came with mine. Currently it is unplugged. In the winter I might use it a bit only if I let the house get pretty cool at night. A deep fill bed will probably require one, but you may find you don't use it much.
Also, they have a two year water treatment on the market now (I don't know how long it has been, I just learned about it when I bought the new bed) so you don't have to mess with the conditioner often.
As for the heater itself, they are still just large mats. The old ones were flexible and could be rolled into a tube. The new style look the same but they are rigid and cannot be folded or rolled. I don't really know the difference, but the ones that must stay flat are the new style.
I have some shooting schools all weekend, but I will get you the manufacture of mine ASAP.