I have the same Raritan 20 gal. model. It comes with a 1250 watt element. Pretty anemic and slow. In March when my element burned out I called Raritan and they said it is a standard element. I went to Lowe's and bought a 1500 and 2000 watt. I installed the 2000 watt and it make a great difference. It heats almost twice as fast, really saving on generator time if dry camping. And we haven't been able to run out of hot water when taking long showers.
Something also interesting is they also said you could convert it to a 240V unit by changing the element and your wiring to 240V.
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