Hi,
I went with the Furrion 2.4 GPM and will never go back. Thing is that you should not be looking for "6 gal", "10 gal" or "12 gal" since these are on-demand and provide limitless hot water. You just have to get the one that fits the dimensions of yours for an easy install. Mine fit right in the bay where the old water hear was seamlessly. Furrion makes 3 different ones for 3 different bays/sizes. Look and see which one works for your dimensions. It requires 12v and propane.
https://furrion.com/collections/wate...SAAEgJOvfD_BwE
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David
Current: 2021 Cougar 368MBI
Past: 2020 Montana 3761 FL
Past: 2018 Cougar 326 SRX
Past: 2016 Outback 324CG
Past: 2014 Heartland Sundance 3310MKS
TV: 2011 RAM 3500 4x4 6.7 Cummins SRW
Past: 2007 RAM 3500 4x4 5.9 Cummins DRW
Past: 2005 RAM 1500 4x4 5.7 HEMI (300K+ miles)