Changes

Water tank heaters cycle continuously and are energy-rated in kiloWatt-hours/year (kWh/y). A typical 40-gal tank will consume 4,773 kWh/y or 545 Watts/hour, which is 4.95 amp-hours (AH) at 110 VAC. One example delivers 25 GPH or about 5 GPH/AGPHA. Peak power demand is 3,800 W, which will take up a good chunk of a 5,000-W inverter.