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Dry dummy loads are the better way to go and don't have to be expensive.


Take a couple of these bolted to a heatsink and maybe a fan if you want to do any extended testing.


http://www.ebay.com/itm/250W-100Ohm-Stripline-Resistor-Hybrid-Dummy-load-39-0057-DICONEX-/201688889496?epid=1393621438&hash=item2ef5983898:g:oqQAAOSwPCVX~jRV



Also keep an eye out on ebay and the ham classifieds for retired commercial dummy loads. They are rated for continuous duty so no worries about transmitting too long. I have one rated for 5kw that cost me less than something from mfj.