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To continue. The whole point of an automatic change over valve is that it is automatic. I can't see the value of having to do it manually.
After it's changed over you get the red flag on the valve and you simply change the bottles on the side that has run out. You can parallel up as many bottles as you want. A friend has six each side. If you are running a boiler rather than just a water heater you need that many or even more..
You simply cannot get a cold shower if you forget to do it manually.
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