Dear B.Nowak,
You omitted to mention whether interested in ISO 22000 or FSSC 22000. It has some relevance.
The specific presentation format of the PRPs for yr site / HACCP system / ISO22000 is up to you but the content must be in compliance / satisfaction with the requirements of the relevant standard. Tony’s layout should assist your / the auditor’s ability to check the PRP program for completeness and appropriate correlation to the ISO/FSSC 22000 standard.
Regarding boiler chemicals et alia, the introduction of ISO 22002-1 contains this text (and some more following) –
Food manufacturing operations are diverse in nature and not all of the requirements specified in this technical Specification apply to an individual establishment or process
.
Presumably no boiler > no boiler chemical > No need for 6.3 ? 
The use of iso 22002-1 (for food) is extremely convenient but, AFAIK, not mandatory to use for certification to ISO 22000. However, AFAIK, it is mandatory for certification to FSSC 22000.
Note that document iso 22002-1 is intended to be used in conjunction with iso 22000.
Some examples of individual PRPs as utilised within the IFSQN, ISO 22000 package (developed by Tony-C) may be downloadable from this site. 
Rgds / Charles.C