For what it's worth, we keep one of those 1 cup 12 volt immersion heating elements in the van. It's not fast, but it works great rolling down the road when Laura wants a cup of tea and we don't want to stop. The 12 volt outlet is directly above the sink, the cup (often a hydro flask) gets braced in the sink (in case of bumps and spills), we plug it in and 10 or 15 minutes later her cup of tea is ready. It needs to be stirred once in a while when heating in the hydro flask because it is shallow and the hydro flask is comparatively deep, but it is simple and gets the job done in that circumstance.
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“Flint” - 2016 SMB Sprinter 4x4 144" RB 150S w/ PH
KN6BJX
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