Rheem 199,000 Btu/hr User Manual page 31

NOTE
Connection to space-heating
circuit through potable water
system as shown may be
prohibited by local code.
INSTALLATION
TANKLESS WATER HEATER 199
Tankless
Water Heater
4
Non-ferrous pump (sized for combined head loss of water heater and air
1
handler)
Check valve (may be built into pump)
2
Potable water expansion tank
3
Mixing valve
4
Figure 24: DHW and Air Handler Piping
1-23