--70.168.x.xxx

You can't share a breaker or a fuse with that much draw. Are they fuses or breakers? --174.198.xx.xx

Ooh sorry they are breakers. My electrician said the breakers are older, he is going to quote me for a whole new box. Said they do not make then anymore. Thanks NE, shows how much I know about electrical components. I don't need with anything electrical. I am going to leave it to my electrician --172.56.xx.xx

And tenants should be paying for water and electricity...so how is it they share a breaker? --69.80.xx.xxx

Buy what is called a double-double 30 amp breaker. It will run 2 30 amp circuits in the space of 1 double pole 30 amp breaker. It's essentially a 2 in 1 breaker. You don't want to load up a panel with these types of breakers, but they work in a situation like this. Pricey breakers, but WAY CHEAPER than replacing the whole panel. IF your electrician doesn't know what a 30 amp double double is without you explaining it to him, get a new electrician. --70.44.xxx.xx

Thanks SC, as I said, I am leaving this to my electrician. NE for the great advice, I will convey that info to him. --108.34.xxx.xx

Even though the capacity of a water heater is the same the elements can have different wattage. If there are high wattage elements then the amount current required will increase current which can blow a fuse or trip circuit breaker. A electric water has two elements where the elements come on at different times between lower and upper elements where only one element is heating at one time. A electrician can measure the current draw of a element where current draw should be 80 per cent current rating of circuit breaker or fuse. --99.236.xxx.xxx

Theoretically, your water heaters are fine like that. You are blowing the breaker when they both turn on at the same time. --174.198.xx.xxx

Replace the electrician and the circuit breakers, should be 1 for each house and tank. --76.188.xxx.xxx