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Posted by HeatPro on January 06, 2010 at 11:08:07:
In Reply to: Re: Replace PI with Millivolt? posted by tk03 on January 05, 2010 at 09:22:03:
: The reason the newer boiler is not millivolt is manufacturers cannot build them anymore due to not meeting minimum government standards.
True, the minimum efficiency of 78% for steam and 80% for water and air keeps the standing pilot out of machines. There are millivolt units made for special circumstances where efficiency ratings aren't a requirement for that application.
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