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20 kW, Water-Cooled RF Terminations
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Personal Greeting

8740 Series, RF Loads are designed as compact, low VSWR and non-radiating terminations for high-power transmitter/transmission line systems. The units generate almost no ambient heat, making installation space minimal and convenient, in any position. The RF power is converted to heat in the hollow resistive film load resistor and directly absorbed by the water flowing through it.

  • Broadband water-cooled load for long-term RF dissipation when heat must be efficiently transferred away from the area./li>
  • Small size may be carried easily, used in any position and installed anywhere there is a source of potable water.
  • Requires flow rate of up to 8 gallons (30.4 liters) per minute.

product specifications:

Item No

8740 Series

Item Name

20 kW, Water-Cooled Terminations

Power Rating

20 kW continuous

Frequency Range and VSWR

1.1 max. 1 kHz - 900 MHz (DC for continuity checks)


Potable Water

Water Temperture Range

+5 to +60 °C

Water Flow Rate

6 gal./minute @ 5 °C to 8 gpm @ 60 °C
(22.8 liters/minute @ 5 °C to 30.4 lpm @ 60 °C)

Product Type


Operating Position



1/2" FPT or 3/4" hose


Seew Model Matrix

Input Flange Diameter

5-3/16" Dia. (132 mm)


Black Powder Coat


19-1/2" L x 3-1/2" Dia.
495 x 90 mm


15 lbs. 13 oz. (7.2 kg)

Model Selections/strong>

Model Connector
8745 3-1/8" EIA, Flanged
8746 3-1/8" EIA, Unflanged (Flush)


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Declaration of Conformity