Consider buss circuit breakers.......they're resettable.
Assuming that your 1440W electric water heater uses a std 1" straight thread heating element, consider swapping that out for a 200W or 300W 12V element. They screw right in plug and play. The trade here is you may need larger gauge wire (haven't done the calcs...let's see 1440/110=13 amps vs 200/12=17 amps)....not huge....
The other downside is it takes 7 times longer to heat the water....but.....
Heating water with your house batteries is a tough challenge; using an inverter to make 110VAC to heat the water is roughly about 92% efficient, adding another 8% of wasted battery power that goes to heating up the inverter and spinning the inverter fan to get rid of that heat.
I have a 2 gallon electric water heater that came with a 1440W element; I've switched that out for a 200W element and by day three of camping and showering once a day my house batteries get down to about 50% state of charge (12.2V or so).....so it't tough.....I've got 340AH in house batteries and 300W of solar on the roof.