18
Installing the water heater:
Typical Installation of Water Heater
NOTICE: The National Fuel Gas Code (NFGC) and B149 mandates a manual gas shut-off valve: See
NFGC/B149 for complete instructions. Local codes or plumbing authority requirements may vary from
the instructions or diagrams provided and take precedent over these instructions.
Vacuum Relief Valve
(Not Supplied)
If required, install per local codes
and valve manufacturer’s
instructions.
Outdoor Models
Discharge
Line
(To Suitable Drain)
To Hot Water
Faucet(s)
Relief
Valve
Union
Drain Valve
6" (15 cm) Air Gap
Manual Gas
Appliance
Shut-off
(supplied)
Flue Terminal
Trap
Manual
Gas Supply Line
Shut-off
Valve
Union
Cap
Cold Water
Supply
Shut-off
Valve
Check
Valve
Water Filter
Drain Valve
On/Off
Switch
Conduit
for wir-
ing to
unit.
Optional: Hard wired
or plug in to wall
¥
F
PRIORITY
POWER
ON/OFF
Remote
Control
Water Inlet
Water Outlet
To Drain
Water Inlet
Cold Water
Service Valve
Hot Water
Service Valve
Pressure
Relief Valve
Alternate Water Piping Arrangement
with Optional Valve Kit
AP15318 tankless 10 30 09.indd 18
11/9/2009 3:17:40 PM