Large radio/TV transmitting tubes are water cooled (heat exchanger). Yes water by it's self cools much better than any mix. It has taken the RR industry a long time to deal with coolant as they cool the engines with just water and they just let the engines run in freezing weather. It slowly dawned on them that running a 3,000HP engine was a little costly so they now mostly use a small diesel gen set and use electric heaters to keep the big one warm and the batteries charged.
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