Pump-Off

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A test of selected waterpumps – Joe

SUMMARY: System resistance takes a BIG toll in waterpump flow rates.

Pumps

The good guys at Xoxide.com were nice enough to send a bunch of waterpumps to test out:

  • Eheim 1048 – 10 watts
  • Eheim 1250 – 28 watts
  • Hydor L20 – 14 watts
  • Hydor L30 – 23 watts
  • Via Aqua 1300 – 28 watts

Eheim is a well known brand in watercooling circles, Hydor and Via Aqua less so. The Via Aqua is noteworthy for all its accessories:

Accessories

I particularly like the ball valve with “fill tube” (upper left) – for a closed loop system, this greatly simplifies bleeding the system; this can also be done using the intake nipple shown as the bottom left. Considering its price is about half that of the others, the Via Aqua deserves a look.

The Test

I assembled two watercooling setups:

Each pump was fitted with supplied intake/outake nipples; the filters and filter housings were removed.

I then immersed each pump completely, ran each until all bubbles were cleared and then timed how long each took to fill a quart container (three times for each pump). The only difference was the pump – everything else remained the same for each pump. In addition to the pumps listed, I included a Beckett G150APCP (not a current model – 60 watts) – a centrifugal pump rated at 150 gph (the rest are mag-drives).

Test Results

High Resistance

Pump

Measured gph

Rated gph

Percent M/R

H Max   ft

Hydor L30

34.5

320

11%

6.4

Beckett 150

32.6

150

22%

na

Via Aqua 1300

31.6

343

9%

5.7

Eheim 1250

31.1

317

10%

6.6

Hydor L20

26.1

185

14%

4.4

Eheim 1048

25.5

158

16%

4.9

Moderate Resistance

Pump

Measured gph

Rated gph

Percent M/R

H Max   ft

Hydor L30

53.9

320

17%

6.4

Beckett 150

53.2

150

35%

na

Eheim 1250

49.5

317

16%

6.6

Via Aqua 1300

49.3

343

14%

5.7

Eheim 1048

43.0

158

27%

4.9

Hydor L20

39.2

185

21%

4.4