For soft soldering of water pipes, use solder according to DIN EN 29453
Properties
In accordance with the provisions of the DVGW (German Technical and Scientific Association for Gas and Water), in copper pipe installation only flux according to DVGW worksheet GW 7 may be used
During processing, solid solder wire must also be added to accomplish the necessary filling of the soldering gap
The solid solder wire should be of the same alloy as the solder in the solder paste