Rinnai RU160eN 9gpm tankless outdoor water heater - $500

I have a Rinnai RU160eN exterior water heater purchased in Sep 2020 for sale for $500.
This is the exact model I purchased: https://www.
amazon.
com/gp/product/B07CVRN2JK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 .
The unit works fine just switched to a heat pump water heater so no longer need the gas one.
The unit was flushed every 2 years and never had an build up.