I talked with my contact at Exel for you.
The Excel RV Tankless On-Demand Water Heater - Gas - Electric Ignition - Ventless - 38,000 Btu # EX93FR comes with a drain valve. It only uses water on demand but if it is going to sit for some time you can drain it of any residual water to keep it safe if you feel the need.
It is recommended for incoming cold water temperature above 50°F, however it can take lower incoming temperatures down to 40°F by reducing water flowrate (control knob can... view full answer...
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