HOWTO: Water System Winterizing
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© 2016 by Erwin Hymer Group North America, Inc.
Complete the winterization
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• Check to be sure that the drain on the fresh water tank and the black and and gray waste water tank valves are all closed.
Move the single lever galley faucet all the way to the cold side, and leave it open.
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• Add 2 gallons of non-toxic RV approved antifreeze to the fresh water tank gravity fill using a spout or funnel, and wash any
spillage off the paint.
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• Turn the water pump on and allow to prime. Close cold galley sink faucet once you see pink antifreeze coming out.
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• Run antifreeze from all fixtures.
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• Move the single lever galley faucet to the hot side, and run until you see pink antifreeze come out.
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• Open both hot and cold faucets in the bathroom sink
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• Flush the toilet.
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• Open the hot and cold faucets on the outside shower
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• Press and hold the cold handle on the instant hot water dispenser until undiluted pink RV antifreeze emerges from the
faucet. Then do the same thing with the hot handle. You will be filling the hot water reservoir with antifreeze, which takes
approximately a gallon, so this may take some time.
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• In the cabinet under the convection oven there is a water filter for the instant hot water dispenser. After running
antifreeze through the system, twist and remove this filter, pour the antifreeze in the filter down the galley sink, and
reinstall the old filter. Buy a new filter to have on hand for dewinterizing in the spring, but do NOT install the new filter
until you have purged all the antifreeze from the system. This filter should be replaced annually, so it's most
convenient to replace it at the time of dewinterizing.
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• Ensure antifreeze flows into all P-traps (galley sink, washroom sink, and shower drain). Add any extra antifreeze to the
galley, bathroom sink, and shower drains.
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• If the water pump loses its prime in this process, add more antifreeze to the fresh water tank.
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• Open the grey and black waste tank valves, and operate the waste water discharge pump for about 10 seconds. You should
see pink antifreeze coming out of the waste water discharge hose.
