||Are you asking if taking hot water from an urn is permitted? Yes, as long as it is not the type of urn that is attached to the plumbing and continuously fills with cold water to replace the hot that you took out.
Using a filter would be permitted in this case because you are not filtering a mixture. The case being, that you are pouring water from a cup into a filter that has ground coffee beans in it for the taste of the beans. Do not pour directly from the urn or kli rishon into the filter (onto the coffee beans).
THIS IS AN AMMENDED REPLY.