Mich. Admin. Code R. 408.4253 - Hot water boilers included; exempted

Rule 253.

(1) These rules for hot water boilers shall apply to all hot water heating and hot water supply boilers to be designed for pressures not exceeding 160 psi and temperatures not exceeding 250 degrees Fahrenheit.
(2) For conditions exceeding those specified above, the rules for power boilers shall apply.
(3) Except as provided in R 408.4253(4), the following classifications are considered not to be within the jurisdiction of this part of these rules: hot water supply boilers which are directly fired with oil, gas, or electricity when none of the following limitations is exceeded:
(a) A heat input of 200,000 Btu per hour.
(b) A water temperature of 200 degrees Fahrenheit.
(c) A nominal water-containing capacity of 120 gallons.
(4) All hot water supply boilers, including those exempted in R 408.4253(3) shall be equipped with safety devices of proper type and size as specified in R 408.4278 and be of code construction.
(5) For conditions exceeding those specified in subrule (1), cast-iron construction is not permitted.


Mich. Admin. Code R. 408.4253
1979 AC

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