Here is my dilemma.

I am looking for a 5 gallon Water Heater to heat water prior to a preheated system reaches where I need the hot water.

No one has Propane 5 gallon water heaters for homes that I can find.

I see a lot of Tank-less Water Heaters

Will a Tank-less Water Heater work with a Preheated system.

I plan on Building a Solar / Wood Water Heating System and have a large Heated Water Storage Tank in a separate area other than my Kitchen Building and Bedroom with a Bathroom on it (separate Buildings) for my off grid place in Arizona.

Any help would be appreciated