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Honeywell R8845u reliability vs transformer+fan relay
So I purchased a home that has a gas fireplace (only source of heat in the house) and for the first 10 months their setup had worked flawlessly. They were using a 750ma/24va sprinkler timer transformer to power the Nest which then went a Packard PR380 24vac fan relay. A few weeks ago the Nest would show that it is running, set to 68, but the house temperature dropped to 39 degrees. I drove up to look and the fireplace would kick on for a minute, then stop even though the Nest was still orange and allegedly heating. I replaced the transformer and it did nothing. I then replaced the relay and it worked again.
Obviously the spring or something in the relay had gone bad. That said, it is 200 miles away and I was anxious about it going bad again in an inconvenient time so I went about changing it. I bought a Honeywell R8845U1003 which seems to do everything all in one box, and I drove up and swapped it out. It works as expected but what I am really hoping is that it is more reliable. It seems this box is made for millivolt systems, but I am curious if anyone is using this and how long as it worked trouble free? Am I crazy to assume this should be more reliable?