Chapter 10
Tankless Coil Piping
Tankless coils are typically installed as
shown below. However, the specific boiler
manufacturer’s instructions must always be
followed.
Anti-scald devices are required to prevent
high temperature water from causing severe
burns. Water temperatures above 120°F can
cause serious injury. To ensure correct temperature
control use a thermometer at a faucet
outlet.
The “high temperature hot water” piping
shown is attached to appliances that require
hotter water than is provided through a mixing
48 National Oilheat Research Alliance
valve. (commercial
dish washers,
etc.) All other hot
water connections
should be piped to
the “mixed water”
piping.
It is a good practice
to install the
Anti-scald Valve
anti-scald mixing
valve 6 -10 inches below the tankless coil to
prevent the valve from being exposed to high
water temperatures that can stack at the top of
the coil.
3/4" Control
Tapping
Flow
Control
Cold Inlet
High Temperature
Hot Water
Tankless
Heater
Mixed Water
12" Min.
Water Mixer