A gas tankless water heater is sized by the flow it must deliver at the temperature rise your inlet water demands: read the stated maximum GPM, the BTU/h input, the fuel (natural gas or propane) and whether the unit is listed for indoor or outdoor mounting. Gas supply, venting and combustion air are decided by a licensed plumber or gas installer under your local code, not by a listing.
Exact listing: CAMPLUX 1.58 GPM Portable Tankless Water Heater with Water Pump Kit, Propane Water Heater Outdoor with 1.2 GPM Pump, 41,000 BTU, BD158P43
Listing identifier: B07FTK91YG. View listing source.
Title identifies the seller's listing; it is not an independent performance test. Check the selected configuration, current price and seller on Amazon.