silence pumps, what gph at 5' head?..

[psidriven]

hi roger,

thanks again for the help with the nanostreams, great customer service!

quick question regarding the silence pumps. i was trying to look at the charts regarding flow with head for the 1073.020 and 1073.040, but they were unclear as to how much flow and i have heard that the charts are a bit overrated.

in doing a quick rc search, there also seemed to be somewhat of a large range of responses regarding flow rates (from 150-250 gph for the .020 at ~5' head; and 350-450 gph for .040 as same head)

i was wondering if you could give me a bit tighter of a range (for example, around 380-420 gph for the .040) in terms of your observations of the flow for each of these pumps at 5' head? (or observations from anyone else who has done measurements on flow for their silence pumps..)

also, how to the pumps compare with the eheim pumps in terms of noise and flow at 5' head? i have an eheim 1250 that is rated on the rc calculator at 134 gph at 5' head, which seems about right when i measured the flow myself. thanks for your assistance!

 

[rvitko]

It isn't an issue of the charts being overrated, just very hard to convert and work from, they chart meters of head agains cubic meters of flow, these increments are huge so converting to smaller increments leaves a much bigger margin of error when plotting on a simple parabolic flow graph. That is why these responses range so much as it is very hard to narrow down further with all the required conversion and most people give me a range of 4-5 ft, since we are specifically citing 5ft, I will try to convert as accurately as possible.

5ft is 1.524 Meters, we will call it 1.5 as that is the nearest line on the flow chart. At 1.5 the chart shows about .75 (198gph) cubic meters of flow for the 1073.020 and 1.5 (396gph) cubic meters for the 1073.040. I would place that accuracy within + or - 20gph.

Compared to Eheim, I would say noise is the same, Eheim makes a great pump, for a return pump I would say it is the standard all others are compared to. The main differences will be Eheim pumps handle higher head pressures, they also use more power and create more heat, it is a trade off.