What happens if the new infinite switch is "B" rated while the old one is not?

The correct response indicates that if a new infinite switch is "B" rated, while the old one is not, the unit will heat more. An infinite switch controls temperature settings by adjusting the power supplied to the heating element. The rating refers to the energy capacity and efficiency of the switch.

If the new infinite switch has a higher rating (in this case, "B" rated), it allows for greater power transfer to the heating element compared to a lower-rated switch. This means that when the switch is engaged, it can facilitate a higher wattage output, resulting in increased heat production within the unit.

Additionally, because the infinite switch determines how much energy is allowed to flow to the heating component, a switch with a higher rating will provide more heat, assuming the rest of the system is compatible. In contrast, if the switch rating was lower, it would have restricted the heating potential, thereby reducing overall heat. Hence, it's evident that the new B-rated switch enhances heating capacity beyond what the previous switch allowed.