Nibe VPB S Manual page 24

Emptying
The water heater is emptied through the siphon (with
hose) in the cold water connection (XL3).
Drain the coil section through the siphon (with hose) on
the docking connection, return to heat pump (XL9).
Drain the solar coil through the siphon (using hose) on
the connection, return to solar heating system (XL14).
VPB S300
XL3 XL9
VPBS S300
XL4 XL3 XL9 XL14
168
560 440
600
24 Chapter 3 | For the Installer NIBE VPB S/ VPBS S