3. Sections 14, 16 and 18 of the Act do not apply to the installation of the following vessels nor to an addition to or modification of their piping:
(1) air tanks whose diameter is 0.61 m or less or whose volume is 0.35 m3 or less;
(2) hot water or thermal fluid low-pressure boilers whose wet heating surface is 10 m2 or less or whose power is 200 kW or less;
(3) hot water tanks whose diameter is 0.92 m or less;
(4) the components of a refrigeration plant whose total compressor motor power is 20 kW or less.