Hot water heater

https://www.homedepot.com/p/Rheem-Performance-Plus-8-4-GPM-Liquid-Propane-Outdoor-Tankless-Water-Heater-ECO180XLP3-1/206934781?source=shoppingads&locale=en-US&mtc=Shopping-VF-F_D26P-G-D26P-26_10_WATER_HEATERS-Rheem-NA-Feed-PLA-NA-NA-WATER_HEATERS&cm_mmc=Shopping-VF-F_D26P-G-D26P-26_10_WATER_HEATERS-Rheem-NA-Feed-PLA-NA-NA-WATER_HEATERS-71700000033150354-58700003868932471-92700031086650225&gclid=Cj0KCQiA7qP9BRCLARIsABDaZzg9Qn6QrUMpZr0E1x0dKxKtJ6hqeihQ_y4hnoRdsXerib9JtXLa_dgaAuhuEALw_wcB&gclsrc=aw.ds

And then outfit it with a close loop recirculating system like this

All in all it shouldn’t cost you more than $12-1500 to completely install this unit. They have other ones that are made for interior installation as well

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