Worcester GREENSOURCE 6 kW Installation Manual page 16

Connecting to the heating system
Detailed discharge pipe installation requirements
The discharge pipework must be routed in accordance with part G3 of schedule 1 of the building Regulations.
The tundish should be vertical, located in the same space as the unvented hot water cylinder and be as close as possible
and within 500mm of the safety device e.g. the temperature relief valve. The discharge pipe from the tundish should be:
made of metal
at least one pipe size larger than the nominal outlet size of the safety device (larger sizes may be required if the
equivalent hydraulic resistance exceeds that of a straight pipe 9m long - refer to BS6700)
terminate in a safe place where there is no risk to persons in the vicinity of the discharge, and position safely from
electrical devices.
have a vertical section of pipe at least 300mm long below the tundish before any elbows or bends in the pipework
installed with a continuous fall
visible at both the tundish and the final point of discharge or where this is not possible or practically difficult there
should be clear visibility at one or the other of these locations
16