Shut down water to home and gas to water heater. Drain down portable water system and water heater. Replaced three-quarter inch PRV in crawlspace. Installed new 40 gallon gas ream water heater in utility closet. Customer will have possessions moved out of utility closet before project can begin. Furnish and install 2.5 gallon thermal expansion tank and replace isolation valve for water heater. Make all necessary connections before pressurizing system. Bleed out all air and light water heater once full. Replace fill valve in upstairs toilet.