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Peerless Direct Heating

I have an peerless oil fired boiler
serial number JOTW 119760-0193

Assume it is a Jan 1993 (93) age on boiler.

The pressure or thoughput loss on the hot wwater direct heat(tankless) has significantly decreased in the last 2 months or so, it has been decreasing all along. We have very hard water, etc. etc.

I am looking to replace the coil and notice that there are about several models PF-4, PF-5, PF-6, PF-8, PF-10, PF-12, PF-15, PF-20. the second number being the gpm rating.

2 questions.
how do I know what I have now?
Can I increase the model size to allow more throughput? (Are they interchangable)
thanks
george
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