The new Worcester 8000 boiler has, like most worcester boilers, a wall jig to pre-plumb the pipes. These usually consist of a steel bar with brass valves through holes in it bolted to the bar. So pretty electrically continuous. Despite this the 8000 has an extra copper bar connected to to each valve. couldn't find a pic but got a screenshot from an unboxing video;

• Edit; since a fair few bits within the boiler are now made of plastic, and with regards to AJJ's mention of maintenance, it sort of makes sense to have good continuity across the pipework.  Also, instructions say the first meter or so must be in metal, before plastic pipes can be used.

The new Worcester 8000 boiler has, like most worcester boilers, a wall jig to pre-plumb the pipes. These usually consist of a steel bar with brass valves through holes in it bolted to the bar. So pretty electrically continuous. Despite this the 8000 has an extra copper bar connected to to each valve. couldn't find a pic but got a screenshot from an unboxing video;

• Edit; since a fair few bits within the boiler are now made of plastic, and with regards to AJJ's mention of maintenance, it sort of makes sense to have good continuity across the pipework.  Also, instructions say the first meter or so must be in metal, before plastic pipes can be used.