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0-16oz or 0-4psi Vaporstat?

I've got Pressuretrols, and like most have experienced here, with setting at 0.5 and differential at 1 the boiler runs until about 3psig and cuts back on around 1. I'm confused by the literature on the vaporstat L408A - if I go with the 0-16 o.s.i. is there a chance that I won't be able to run the system at high enough pressure, conversely, if I go with the

I am in the process of replacing all traps (or replace cages) and the system has been mostly insulated (all mains). Currently at the 2-3psig there is NO problem getting all the radiators hot.

THANKS for your input-

Brian
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