These requirements cover indoor hydromassage bathtubs@ rated 250 volts or less@ for household and commercial use@ for permanent connection to the plumbing of the building. They are intended for either permanent connection to the electrical supply or are factory-provided with a cord terminating in an attachment plug@ and are intended for installation and use in accordance with the National Electrical Code@ NFPA 70. These requirements do not cover portable cord-connected hydromassage equipment@ which is covered by the Standard for Personal Hygiene and Health Care Appliances@ UL 1431@ or hydrotherapy tubs@ which are covered by the Standard for Medical and Dental Equipment@ UL 544. The majority of the requirements in this Standard address complete hydromassage bathtubs@ including field-installed accessories. The following sections specify requirements for field-installed accessory heaters evaluated and certified for the hydromassage bathtub manufacturer. a) Hydromassage Bathtubs Configured for Field-Installed Heaters@ (CONSTRUCTION) Section 25@ and b) Field-Installed Heaters@ Section 26. c) Test for Field-Installed Heaters@ (PERFORMANCE) Section 62. d) Hydromassage Bathtubs Configured for Field-Installed Heaters@ (MARKINGS) Section 68@ and e) Field-Installed Heaters@ Section 69.