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Posted by HeatPro on October 26, 2005 at 11:13:08:
In Reply to: Re: Replace or repipe this boiler? posted by Dave on October 26, 2005 at 10:12:11:
Ordinarily an orifice that large doesn't make noise.
You had that 0010 question answered in this email:
"A 0010 would produce slightly more than 30 gpm,
which is all your heater needs with both stages running. The head loss in the
piping is negligable, probably less than 1 foot of head. You can turn the valve
to the boiler to produce a 30 degree rise in temperature from the inlet to
the outlet with both stages on (and all zone pumps running) to make
the back pressure if you find you need it after running the system for a while.
The rise with only one burner stage on would be about 15F.
A B G 100 is the equivalent and would have the
same flow in your primary loop.
----- Original Message -----
From:
Dave
To: Harold Kestenholz
Sent: Tuesday, January 11, 2005 7:54
PM
Subject: Re: ? replace 300,000 BTU boiler
one modulating boiler
Harold,
The plumber I had look at the system did not
think that the idea of two 007 pumps in parallel was something he'd feel
comfortable doing.
So I am wondering about using a 0010 with the 2"
cast iron for the primary pump.
The boiler has about 1 foot of head at 25 gpm. We
have 15-20 feet of 2" cast iron pipe with about 12 90 degree elbows in the
main loop. "