Measurements
I measured the only two things I could: noise and power consumption.
Noise
The value registered by the phonometer was practically identical with the pumps switched on and off. At one meter distance I recorded a value between 39 and 39.5 dB, making these pumps the best in terms of noise.
Power consumption
It is quite hard to measure instant energy consumption. In order to do so I used a current probe which recorded an electric current of 0,109 A. This is only a partial measure, as it has been impossible to record the power factor (cosφ). Anyway, we can still make some interesting deduct.
The adsorbed current, or the power consumption, results as follows:
Tunze Turbelle Nano Stream 6095 with a 9.500 l/h flow: 0,109 x 220 V = 23,98 watt
Considering the declared power consumption of 21w, the cos(fi) should be equal to 0,88, a legitimate value for a propeller pump and optimally high.
The apparent current of 3 watt is not registered by our home electrical counter, so we will not spend more.
It results that at the maximum power consumption of 21 watt, using two pumps in the alternate mode between 30% and 100% we would obtain an average of 12 hours consumption at 100% and 12 hours at 30% for each single pump. Adding up both pumps’ consumption we would obtain around 2x(21*1*12+21*0.3*12)*365= 119,574 kwh per year, with the cost of 0.26 euro/kwh resulting in 120*0.26= 31 € per year or 2.6 euro per month.
Personal observations
These pumps have shown to be very reliable. The flow is well balanced and distributed regularly, even in the presence of fine sand on the tank bottom. This is probably because of their large outflow which could anyway result in the formation of a few holes in the sand.
They are very silent, as we demonstrated with measurements. We can hear the pump noise when we try to use them both at the same time with a frequent wave motion of 1 or 2 seconds. I currently use them with a frequency of 5 seconds without any noise related problems.
They are so silent you almost can’t hear them at all and there are no vibrations on the glass thanks to the blue rubber feet “silent block” which obviously do their job well.
The pump outflow is quite large, not like the Ecotech Marine Vortech MP40, but they are very different pumps.
Anyway I found these pumps were perfect for my 130x60x50h cm marine tank, the flow was always abundant even in the presence of bigger coral colonies.
In order to maintain the flow at its best, it would be a good habit to often clean the inflow grid which could be blocked by algae and dirt and reduce the pump outflow.
We can actually remove the… removable grid, as we don’t need to worry about the fishes’ safety if the pump is always on. This would be advised against if the pumps were switched off for different time periods.
Lately, as I said at the beginning, I added a third Tunze 6095 for moving the sediment behind the live rocks, and this is set with a constant 50% flow rate.
The magnets
The magnet included holds the pump onto glasses up to 15 mm thick.
You can notice the four little holes for the glass protecting rubbers, which are included and need to be inserted in both the wet and dry magnet.
The package includes a 24v power supply, the pump body and a multipolar connector to which the controller can be inserted.
