Probably the least expensive way is to just go and purchase a simple 30 gallon electric hot water tank. Unless you have a lot of teenagers a 30 gallon is just fine.
The electric tankless heaters vary from manufacturer to manufacturer. Wiring is a cost issue. And the up front cost of unit. Few know how to repair such.
Propane tankless heaters work fine - I have one. Most last a long time. Up front cost is high. Then there is the plumbing of gas pipes to unit. The venting either through wall with a power vent or up ceiling through roof. I just would not let anyone cut into your roof for a vent. Too many potential issues. With propane tankless heaters you have to understand flow rates and water pressure. All affect performance.
You might get satisfaction thinking your are saving energy costs with a tankless propane heater and bragging rights.
Do a cost analysis and see how long the payback time is.
In my final conclusion - I would have preferred a simple 30 gallon electric. Simple and lower cost when time comes to replace. I would put a simple on/off switch for when going away for a week or such - just turn it on/off.
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