I recently upgraded my sump from a 55gal aguarium to a 90. With it I upgraded return pump for more flow. I wanted DC for energy savings and controlability but was concerned with reliability. I decided the best solution would be redundancy and plumbed two return pumps with independent plumbing. One is the Varios8 the other a Vectra L1. Here are some observations after running them side by side for almost a year now.
First of, both pumps have run flawlessly for almost a year with zero issues and zero cleanings.
I have to keep both pumps turned down to approximately half power. One is plenty flow for my system which is fairly large (210 dt, 40 frag tank, 90 sump).
The vectra is more controllable. Basically it has more settings (12) vs Varios (5). When turned up to max the vectra is also quite a bit quieter.
The Varios, although smaller proved to be more powerful (more flow). I was a bit surprised by this.
I don’t have any precise way to measure flow so what I did was turned one pump on at a time and turned it up from the lowest setting to the highest and while marking the water level in the sump on the outside with a marker. Basically the stronger the flow out of the sump the lower the pump would pull the water level down. Here is what I found:
Varios on speed 1 is about equal to speed 2 on vectra
Varios on speed 2 is about equal to speed 6 on vectra
Varios on speed 3 is about equal to speed 10 on vectra
Varios on 4 is stronger than vectra on 12 (max)
And Varios has a 5th setting which is even stronger (although a bit too loud to my ears)
I know this method was far from “scientific”. The plumbing for both pumps, for example, is very similar but not 100% identical which will obviously effect flow. However this should give you a general idea of flow for the 2 pumps when compared to one another.
End of the day if I had to just pick one it would be a very difficult decision.... but i’d probably go with the Varios simply because it’s less expensive. If cost is not a factor, go with the Varios if you need more flow, or the Vectra for more control and a quieter pump.