Can I use my original OEM knob with this replacement switch

and atmospheric boilers

What are the technical specs for the HH18HA452

The P100DA-86 (identical to the P100DA-86C) features open construction and is rated for 120/240 Vac

Johnson Controls P266AAA-100 Control 318518-761 Can I use my originalThe Johnson Controls P266AAA 100 is an industrial grade single phase condenser fan speed control designed to maintain stable head pressures in 208 240 Vac refrigeration and air conditioning systems. This pressure actuated digital controller replaces legacy P66 and P215 series units, offering a more robust NEMA 3R weather resistant solution for permanent split capacitor (PSC) motors. With a 8 amp maximum output and featuring 3 high VAC triacs, this