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Difference between Honeywell Vaporstat L408J


You guys have given me great advice about a problem w/ my home's boiler not getting the return water back into the boiler fast enough.  I am reading the lost art of steam heating, and taking the advice I've read here--I want to replace my Honewell Pressuretrol with a Honeywell Vaporstat--but I am not clear on the operating range I should buy--the L408J1009 indicates a range of 0-16oz, while the L408J1017 indicates a range of 0-4psi.

I want the boiler to cutoff at no more than than 2 psi --and possibly less, depending on how low I can adjust it and still get steam in the system--can you advise me which of the 2 models is more appropriate for such an application?


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