The efficiency part I can't comment on. But, I do suggest any brand except GE. When I bought my current house the wh was almost brand new. Less than a year later the bottom fell out. It was still under warranty but the dealer could not do anything without GE approval and they denied it. Letters and stomping my feet changed nothing. I had the same experience with a GE electronic air filter. They denied even making or selling it even though I sent photos of the unit and the metal identification label. I ended up getting a Marathon plastic electric heater from my electric company. I pay an $11.00 a month lease but they fully maintain it and, being plastic, cannot rust through. Had it 14 years now with only one heater coil burn out which they replaced promptly at no charge. Buy the best, and that would not be GE.
"Folks is funny critters."
Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire