I had installed a Blue Seas ELCI unit as suggested by the Surveyor, to meet the AYBC codes. It worked fine for nearly a year. Two weeks ago, I was down at the boat and it was cold, so I was running two heaters. After a while, the cabin was filling with electrical smoke. I manually flipped the breaker on the ELCI and shut down shore power. Luckily I caught it. The breakers didn't trip. I think I'll send it to Blue Seas for them to take a look.