Appliance details
2.13 Water connections 
When facing the heater, the ¾” cold water inlet is on the bottom right and the hot water outlet is on the bottom left. Install the heater centrally in the building if possible and make hot water piping runs as short as possible.
INLET FILTER
SCREEN
COLD
HOT 
Fig. 24
B THE USE OF A UNION WHEN CONNECTING
BOTH WATER PIPES TO THE INLET AND OUTLET CONNECTIONS IS RECOMMENDED, THIS WILL FACILITATE ANY NECESSARY SERVICING AND REQUIRED CLEANING OF THE INLET WATER PARTICLE SCREEN.
Although water piping throughout the building may be other than copper, we recommend that copper, galvanized or suitably rated stainless steel flex line piping be used for the water heater connections (follow local codes if more stringent). Never sweat any rigid piping directly to or beneath the water connections, damage can occur to the internal water valve from heating of the pipe. Plastics or other PEX type plumbing line materials are not suitable for connecting directly to the water heater. Keep water inlet and outlet pipes to no less than ¾" (19.05mm) diameter to allow the full flow capacity.
If the cold and hot connections to the heater are reversed, the heater will not function. Be certain there are no loose particles or dirt in the piping. Blow out or flush the lines before connecting to the water heater. Full port valves should be installed on both the cold water supply and hot water outlet lines to facilitate servicing the heater (see Fig. 25). For installation on a private well system with the use of a pressure tank, the lowest pressure range setting recommended is
Connecting the pressure relief valve (PRV)
A listed pressure relief valve supplied with the heater must be installed at the time of installation. No valve is to be placed between the PRV and the heater. No reducing coupling or other restriction may be installed in the discharge line. The discharge line must be a minimum of 4” above a drain and installed such that it allows complete drainage of both the PRV and the line. The location of the PRV must be readily accessible for servicing or replacement, and be mounted as close to the water heater as possible. See Fig. 25. To install the PRV, a suitable fitting connected to an extension on a “T” fitting can be sweated to the hot water line.
Support all piping.
Fig. 25 Plumbing Connections and Pressure Relief Valve
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