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...
Short answer, yes you can convert from 30amp to 50 amp. It will be costly and require an electrician.
Long answer, you will need to replace the power outlet with SmartPlug RV and Marine Power Inlet - 50 Amp - Stainless Steel # SM79FR. Then replace the existing wiring to accommodate for the extra amps.
You will need a new power cord like SmartPlug RV Power Cord - 125/250V - 50 Amp - 30' # SM86FR.
You will need a control center like Progressive Dynamics RV Power Control Center with AC/DC... view full answer...
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