I guess I'm confused. The amount of boiler antifreeze in the expansion tank has nothing to do with winterization. Unless you have automatic winterization in your coach, you have to blow out all the water in the Aqua-Hot system then fill the domestic water loop with RV antifreeze using the onboard water pump. Be 100% certain this has been accomplished as the repairs to the unit can be extremely expensive if it freezes and bursts internal piping.
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Bob Retired Army Traveling alone now, had to put Charlie the Beagle down :(.
2008 Camelot 40 PDQ 4 slides ISL400 towing a 2020 1500 GMC Sierra Denali 4x4 Crewcab
Western MT in summer, AZ, NV in winter
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