but larry.. that was the design, I don't have a means of shutting off my house main zones when im not here lol they flow allll the time.lsayre wrote:Why are you assuming (insisting) that it will still flow by gravity when the homes two main zones are also gravity flowing. That is not its design intent at all. Let it flow for awhile (several hours at least) with the two main home heating zones shut off, so you can once and for all prove to yourself (and set your mind at ease) that it is going to do what you want it to do when the power is out. 15 minutes is not a very good test.
i just figured that with the baseboard directly above the boiler, it would flow through that first and not the house zones, but apparently the path of least resistance is the zones.