We have the 24TX Gemini, which is on the Mercedes chassis. The chassis battery for it is also under the driver, though I believe its more under the floor. As far as the gerard water heater, it has some idiosyncrasies that take a bit of getting used to vs hot water from a hot water tank. One thing about its functionality is, it must have a minimum amount of water flow through it to maintain hot water, if it drops below, whatever that minimum is, the heat cuts off, and you have only cold water. I discovered that one morning in the shower, used the water cut-off on the shower head, and wound up finishing that shower with cold water. Leaving the water on, solves that problem. Otherwise its seems to work ok.
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