31. Maintenance and Servicing of boilers Boilers in operation should be serviced at least once a year or as required by national law. Efficiency and emission levels must be documented.

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1. Definition: Maintenance and servicing of boilers should be car...
2. Focus: Boilers in operation should be serviced at least o...
3. Additional focus: Servicing of the heating system does not only incl...
4. Implementation: It is necessary to determine which boilers are in ...
5. How to document the criteria: The accommodation should provide a written mainten...

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