Installation Manual

H-Series Demand Duo™ 2 Installation and Operation Manual 26
A Pressure Relief Valve (PRV) is pre-installed on each tankless water heater in the Demand Duo™ 2
system. A combination Temperature and Pressure (T&P) Relief Valve is pre-installed on the tank. Install
a drain pipe from each PRV and T&P Valve into a floor drain as shown in the diagram below. Refer to
the guidelines on the next page.
T&P
Relief Valve
on tank
PRV location on Tankless
Water Heater
Pipe to open drain
To secure the rack: