To fill the hot water heater - once you are hooked up to campground water supply with it turned on, just open a hot water faucet. A burst of air will come out, then nothing for a while, then water. The tank should be full then.
My dad taught me to open the relief valve on the heater and make sure water comes out. I don't know if that is really required but I always do it.
Same instructions if you are using the water storage tank - once this is full, turn on the pump, open a hot water faucet, etc.
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