You are welcome. I could not find any info on your model.
If you want to make your estimate more accurate, measure the voltage and amperage going to the water heater. You should measure it at the breaker panel. Watts = Volts * Amps.
If you do not have a clamp-on amp meter, then use this formula:
Watts = Volts * Volts / Resistance(15.158 from previous post)
The voltage coming into my house varies by 10 volts according to the time of year.
examples:
240v = 3800w
230v = 3490w
220v = 3193w
Over a weeks time that adds up.
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