675 IAC 30-4-18.2 "Heater" defined

Sec. 18.2. (a) "Heater" means a boiler in which water or other liquid is heated under pressure for use external to itself by the direct application of any source of energy. (b) The term includes, but is not limited to, the following types of units: (1) Domestic water heaters as defined in section 15 of this rule. (2) Fired process heaters as defined in section 18.1 of this rule. (3) Instant-on water heaters as defined in section 25.1 of this rule. (4) Pool/spa heaters as defined in section 38.1 of this rule. (5) Service water heaters as defined in section 45 of this rule. (6) Thermal fluid heaters as defined in section 49.2 of this rule.