There is a chance, albeit small, that the water heater is the low point drain. If the drain plug in the heater is the lowest point in the system, and it has 3 valves for bypass on it. Don't worry about the valves for draining, only for winter. A small chance, and you will have to be the judge. If the city hook up is higher, then probably so. Besides, the whole system, minus the water heater, can't hold 2 gallons, maybe not even one, so just a good flush before you use it, and you should be good to go. Now the floor plan I looked at, had all the plumbing on one wall, hope yours is similar.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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