Just for Copper- solder less copper bonding is Ultimate Handyman Approved.

Just for copper is also WRAS approved to BS6920

JUST-FOR-COPPER™ Solder less Copper Bonding for Copper Pipes and Fittings is the easiest, fastest way (up to 70% faster than hot solder welding) to permanently install or repair rigid copper pipe in residential homes, apartments, farms, barns, office buildings, shopping malls, and industrial complexes.
It can be used on all rigid copper pipes, fittings, and connectors that carry water, including potable water.
JUST-FOR-COPPER™ Solder less Copper Bonding provides a cold weld between rigid copper pipe and copper fittings and connectors. It is as permanent and durable as a hot solder weld, and is an innovative solution to the time consuming and potentially dangerous hot soldering method of connecting rigid copper pipe to connectors and fittings.
FEATURES & BENEFITS:

• Saves 70% in installation and repair time
• Easy to use by professional or DIY'er
• Non-toxic and 100% safe to use on potable water
• Safe to use -- no fire or burn risk compared to open flame soldering
• No taste or odour
• Superior weld strength! 500 psi official rating