Response to I have a 14 Year old Raypak 2100 (P-R405AL-EN) Pool/Spa heater. BTU/HR Input is 399,000 Natural Gas. The decal on the front reads LoNoX but looking at the circuit board, I can clearly see that the LoNoX jumper is installed. Question: Which Replacement Heater do I need? I believe I need the (P-R407A-EN) Since the jumper is left installed on circuit board, I'm curious whether I can use the R406A model. Just want to be sure that I get the correct replacement.

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