Home Remodel: Do, Don'ts, Advice
I’d think you’d want to find an alternative location for room around the heater than under the stairs. Ideally, near your heat system to leverage any ambient heat. Mine seems to benefit by being in the same room as my solar hot water tanks in the winter. Mostly in eco-mode. (For summer, I don’t need the heat pump to be on unless there is an extended overcast period.)
I think an expansion tank just has to be in the proper sequence and position is secondary.
One tankless downside is water hardness. But as I understand it, they can be flushed periodically with something like Haymaker descaler. You’d want to set up your ports to plug and play the flushing loop and pump.
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