Draining down a caravan for winter storage

[Martin_E]

I would guess that majority of that water was sat in the base of the boiler/heater, this wouldn’t be enough to cause an issue, as for what was in the pipes would have been ok with all valves and taps open (taps midship).

Best routine is turn pump off, remove water pump, open all taps/shower to midships, open drain valve, sited or leaving site, leave the taps/shower & drain until next refill