Why does our water heater keep tripping the fuse? | Yahoo Sep 27, 2006Why does our water heater keep tripping the fuse? Not the circuit breaker panel on the side of the house, the breakers there were good. one used to keep hot water hot - which uses less power). After a shower, the second element may kick in and overpower your fuse. Again, a competent electrician would have made sure this didnStatus: ResolvedAnswers: 12 Problems With an Electric Hot Water Heater That Trips a There are three possible explanations for a breaker being tripped by a hot water heater: water dripping on the electrical lines, a problem with the unit's thermostat or a problem with the breaker.