1. CO and propane are both heavier than air, so the detectors should be mounted near the floor. Smoke rises, so a smoke detector should be mounted on the ceiling. TM puts a hard-wired (not battery) CO/propane detector near the floor just to the left of the kitchen sink, and a battery-powered smoke detector on the ceiling up front.
2. You are right about water already hot. The mfr says it is OK to run both heaters (gas and electric) at the same time to improve recovery time if you want. But neither will run if the water is already hot.
4. If you do a web search, you will find a lot of posts about water heaters making strange noises. There appear to be many causes, such as air in the tank, expansion of the pipes or the tank as temperature goes up, and so forth. They appear to to be annoying more than dangerous, and can usually be eliminated reasonably easily.
5. If a breaker is tripped (middle position), you cannot push it directly the ON. You must first push it to OFF, then back to ON.
Bill
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