The provisions of this chapter shall not apply to:

1. (1) Boilers under federal control;
2. (2) portable boilers used in pumping, heating, steaming and drilling in the open field;
3. (3) portable boilers used solely for agricultural purposes;
4. (4) steam heating boilers, hot water heaters and hot water heating boilers, when used in private homes or apartment houses of not more than five families;
5. (5) hot water heaters approved by a nationally recognized testing agency that are equipped with adequate safety devices, including a temperature and pressure relief valve, (A) (i) having a nominal water capacity of not more than one hundred twenty gallons and a heat input of not more than two hundred thousand British thermal units per hour, (ii) used solely for hot water supply carrying a pressure of not more than one hundred sixty pounds per square inch and operating at temperatures of not more than two hundred ten degrees Fahrenheit, and (iii) not installed in schools, day care centers, public or private hospitals, nursing or boarding homes, churches or public buildings, as defined in section 1-1, or (B) (i) having a nominal water capacity of not more than ten gallons and a heat input of not more than twenty thousand British thermal units per hour, and (ii) installed in any occupancy;
6. (6) antique or model boilers used in public, nonprofit engineering or scientific museums and operated for educational, historical or exhibition purposes having a shell diameter of less than twelve inches and a grate surface area of less than one square foot; and
7. (7) public service companies, as defined in section 16-1.

(1949 Rev., S. 4739; 1953, S. 2364d; P.A. 86-83, S. 1; P.A. 03-15, S. 1; P.A. 04-257, S. 46; P.A. 21-165, S. 14.)

History: Sec. 19-426 transferred to Sec. 29-231 in 1983; P.A. 86-83 eliminated reference to boilers of railroad locomotives, portable boilers used in construction and repair of roads, railroads and bridges and boilers carrying pressure of less than 15 pounds psi., equipped with safety devices and included boilers under federal control, certain steam heating boilers, hot water heaters and antique or model boilers; P.A. 03-15 deleted former Subdiv. (4) re boilers on steam fire engines brought into the state for temporary use in checking conflagrations, deleted reference to steam heating boilers “carrying a pressure of not more than fifteen pounds per square inch, when used in private homes or apartment houses of not more than five families, provided they are equipped with adequate safety devices” in former Subdiv. (5), deleted former Subdiv. (6) re hot water heating boilers carrying a pressure of not more than 30 pounds per square inch, provided they are equipped with adequate safety devices, deleted former Subdiv. (7) re boilers installed and inspected under any city, town or borough system of boiler inspection under standards equivalent to those established under chapter, and removed reference to other places of public assembly in former Subdiv. (8), substituting reference to public buildings “as defined in section 1-1”, renumbered former Subdiv. (5) as Subdiv. (4) and included hot water heaters and hot water heating boilers, made technical changes and renumbered former Subdivs. (8) to (10), inclusive, as Subdivs. (5) to (7); P.A. 04-257 made technical changes in Subdiv. (5), effective June 14, 2004; P.A. 21-165 amended Subdiv. (5) by designating existing provisions as Subpara. (A)(i) to (A)(iii), adding Subpara. (B) re hot water heaters having a nominal water capacity of not more than 10 gallons and heat input of not more than 20,000 British thermal units per hour and installed in any occupancy and making technical changes, effective July 12, 2021.