There SHOULD always be water in the system unless you drained it... but of course Murphy is resident in our RV's - and could have been a leak that drained water... (those drain plugs NEVER leak... right??)
Safest approach is make sure you have water at the hot water faucet before turning on the water heater...
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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