I recently purchased the Harmen Hydroflex boiler, and have only fired it up once. I noticed that it tried to stay at the maximum water temperature, and that it never shut down when it reached the temperature. Is this boiler made to stay fired up all the time? I had it in auto ignite mode also, so I figured it would only fire up when the water temperture hit the minimum setting. Also, what is a good setting for both the maximum and minimum water temperature?