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Pressure Relief Valve
3/4" Ball Valve
Boiler Drain Valve
Domestic Hot Water - Optional Freeze Protection
2 Outdoor Tankless Water Heaters
Preferred Piping Installation
February 27, 2008
This is not an engineering drawing; it is intended only as a guide and not
as a replacement for professional engineering project drawings. This
drawing is not intended to describe a complete system. It is up to the
contractor or engineer to determine the necessary components and
configuration of the particular system to be installed. The drawing does
not imply compliance with local building code requirements. It is the
responsibility of the engineer or contractor to ensure that the installation is
in accordance with all local building codes. Confer with local building
officials before installation.
(Full size of supply line)
With electrical power supplied to a Tankless water heater, it will not freeze in
enviornments as cold as -30ºF, when protected from direct wind exposure.
In the event of a power failure at temperatures below freezing, the water
heater should be drained of all water to prevent freezing damage.
The unit may be drained manually or through the installation of the
Optional solenoid valves as shown.
The electrical connections for the two solenoid valves should be tied to
the 120 V power terminals provided on the PC Board of the water heater.
When the electrical power to the water heater fails, the cold water supply
drain down solenoid valve opens, allowing the water heater and
associated piping to drain. Ensure that you run the drain for the solenoids
per local codes.
outside building structure. These are indicated
by being above the dashed line.
line should be located inside the building
The vacuum breaker line should be located inside
the building structure.
enclosure or recess box and packed with insulation
for additional protection.
Route drain per local codes
Cold Water Supply Line
Gas Supply Line
Equipment List QTY
Tankless Outdood 2
Electronic Connection *
* Refer to Tankless Accessories
and Model Applicability for
electronic connection details.