NEW LPG Paloma tankless water heater and installation parts

New, never installed Waiwela Paloma tankless on-demand LPG (propane) indoor hot water heater. 199,000 BTU Model PH-28RIFSP with thermostat. Perfect for rural home, cottage/chalet, farm, barn, off-grid living, etc. Original buyer’s invoice with list of parts is in last photo. They never installed it, so everything is brand new. ZURN P1000A 3/4” pressure relief valve Z-VENT Adaptor 4in x 5ft Z-VENT elbow4” x 90° Z-VENT PIPE 4 in x 1 ft Z-VENT elbow term 4in x 90° Z-VENT wall thimble 4 in Asking $550 for everything **except Webstone 40443 /RRRVAW EXP tankless water heater isolation valve which is $120 Extra** Cash only. Discount if picked up and paid today. Note: this is not for DIY installation. It must be installed by licensed gas technician.