Just noticed this thread, so am a little late but here goes.
We purchased a Bosch tankless at Home Depot in Mazatlan MX., price was about $250USD it uses propane.
We use it for an outdoor shower, and it works quite well. On occasion we have used it to heat our hot tub, 300+ gallons water in 50degF to pool temp 105deg F.
We sometimes use it to warm the hot tub up just a little prior to lighting the wood heater.
We only use hydrogen per oxide in the tub and change the water every 4 to 12 days depending on useage.
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