What type of tradesperson do you need? Do they offer an after sales service? You should have your boiler serviced once a year to make sure it’s working safely if it’s not running properly, your boiler could start to leak. Citric acid is often using for canning as well as bath bombs, so it’s fair to say its usages are rather varied! Unexpected costs such as a complete boiler breakdown that will need to be replaced immediately. As the owner, i answer the phone personally - monday.