Tech returned August 11 to replace tankless water heater with new high-efficiency tankless water heater, isolated water and gas line and then remove the old system. Tech install new tankless water heater adjusted venting adjusted gas line adjusted waterlines and adjusted condensation drain. filled and tested system purchased air out of the system and fired system up connected, recirculation line to tankless and set external research, both in the programming of the system and set the internal valve to external tested system working well at this time water pressure is sitting 60 psi Premium Water heater WARRANTY Complete 12 year parts warranty Complete Clearview 12 Year Labor Warranty provided annual maintenance is completed by Clearview Extended 15 Year Heat Exchanger Warranty PSI on house is required to be under 80 or warranty may be voided