Originally Posted by poorbuthappy
Sounds like a low point drain, or the valve to drain the tank is open.
Yes. If it's the one with the cap that is the hot water low point drain. That one often works loose and needs tightened up by hand. The other one is the cold/fresh tank drain. That one has a valve up above. Open the closest exterior compartment and look for a removable panel. Both the water filter and drain valve are there.
For the microwave, you are plugged in or running the generator right ? You need 120v power for the microwave. If so check the circuit breaker inside the rv.