Hot water supply boiler
Hot water supply boiler means a packaged boiler (defined in 431.82 of this part) that is industrial equipment and that: (1) Has a rated input from 300,000 Btu/h to 12,500,000 Btu/h and of at least 4,000 Btu/h per gallon of stored water; (2) Is suitable for heating potable water; and (3) Meets either or both of the following conditions: (i) It has the temperature and pressure controls necessary for heating potable water for purposes other than space heating; or (ii) The manufacturer's product literature, product markings, product marketing, or product installation and operation instructions indicate that the boiler's intended uses include heating potable water for purposes other than space heating.