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Joined on November 26, 2011

Last Post on July 23, 2014

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gas pressure

@ February 9, 2013 11:11 AM in Why does this set up "work"?

where was it on/off fire?

maximum efficiency

@ February 9, 2013 10:58 AM in Water preheat?

when the exhaust temp is closest to the steam temp.  You'd be starting to condense on a low pressure system, but it would be interesting to see what could be gotten.

B&G Handbook

@ February 8, 2013 12:44 PM in MONOFLOW GPM

I got so much out of it that I actually bought a 1949 hard copy on eBay.  If you're patient, they can be had for under $10 shipped.

Thanks, Dan!

air space

@ February 8, 2013 11:04 AM in raised floor question

Will resonate like crazy when you walk on it.  Insulate.

another 704 fan?

@ February 7, 2013 10:47 PM in How Would I Disconnect this Radiator?

just curious...

primary-secondary piping

@ February 7, 2013 10:06 PM in Pex-Al-Pex expansion noises

May be worthy of your consideration here.

direct pumped/piped

@ February 7, 2013 3:43 PM in Job pics!

The 110 requires 5 GPM at maximum fire.  The HX has two feet of head at that flow rate.  It will work pretty much anywhere you put it.

tough choice now

@ February 7, 2013 3:01 PM in One riser or two risers

Your boiler installation does not meet the manufacturer's minimum standards.  If a problem develops, Burnham will not be on the hook for warranty coverage.

I'd make the call...

rehabilitation of historic structures

@ February 7, 2013 11:25 AM in Duty of the HVAC technician according to law?

really is a sticky wicket.  I know of quite a few historic commercial buildings whose owners are so afraid of the cost of installing fire sprinklers that they refuse to pull permits for much of anything and are in effect allowing the buildings to rot.  I've had my share of challenges with this and have come to the conclusion that once a project reaches a certain scope, it's really best to involve a preservation architect to run interference between the SHPO and the various state and federal regulators.

TT boilers

@ February 6, 2013 11:54 PM in Triangle tube prestige mod con?

Get factory trained as soon as you are able.  Two days, nearly free net cost.  Once you have it, you get fantastic pricing on extended warranties for residential jobs.

augmented passive solar


is how I'd describe what works here.  Passive solar can deal with over 90% of the season here and it's hard to get any kind of ROI for that final fraction.  Most use direct-vent gas, wood or pellet stoves for this.  The well-heeled often prefer radiant which leads strangely enough to a resistance electric boiler in many cases.

no place else, really

@ February 6, 2013 11:00 PM in Job pics!

head loss in the HX is low enough that they tolerate quite a bit of layout variation.

CSD-1 applicability question

@ February 6, 2013 10:00 PM in CSD-1 applicability question

I had understood that CSD-1 did not apply to boilers smaller than 400 MBTU/hr.  As I start to read I see CG-130 excluding really large boilers and swimming pool heaters, but CG-140 goes on to lay out a somewhat complex series of conditions for listed boilers under 400 MBTU/hr.

CG-140 (1) requires two things:

Compliance with all of part CW
  Is this something we need to verify on a case by case basis?

Compliance with two specific paragraphs of CE-110

CE-110 (a) requires a lockable disconnect "at the boiler" and an external boiler room shutdown.  The first aligns well with both NEC and mechanical codes.  The second seems to imply that I need to include a solenoid-operated gas valve (as interlocked with kitchen hoods) on the plant main?

CE-110 (i) apparently forbids self-resetting controls after the primary?


@ February 6, 2013 8:15 PM in to convert cast iron to steamview in prewar condo NYC

If they want to be absolutely certain, send them out to be professionally prepped and powdercoated.  They will look beautiful for decades.

active solar


is not even necessary in our climate with proper design.  350 days of sunshine and mild summer temps...

not to worry about glycol

@ February 6, 2013 12:12 PM in PEX-AL-PEX tubes for antifreeze

PEX-AL-PEX has an internal PEX layer which is in contact with the fluid.  The aluminum should never see anything other than a tiny bit of surface oxidation at the cut ends of the tube.

I would be concerned about temp limits, particularly near the collector.  I prefer stainless or copper for hot side, PP on cold depending on design.


@ February 6, 2013 12:06 PM in Triangle tube prestige mod con?

on low setting Is too big for most systems IME.  We change them out.  This is why I don't like boilers with internal pumps.

0010 primary

@ February 6, 2013 11:27 AM in Triangle tube prestige mod con?

Seems like a LOT of flow for ~100k output through that HX.  We typically use a 0010 or a Series 100 as a 399k boiler pump.

Minimum flow rate at maximum fire on the 110 is 5 GPM, at which point the HX has only 2 feet of head.  What's your boiler ∆T look like?

Glad the system side working better on 30F ∆T.  35F might even fly...



over the largest surface area possible.  Floors, walls, ceilings, whatever it takes.  Proper passive solar design works magic here.  Solar thermal collectors, large buffer tank, and a wood gasifier for backup.

my insulation guru

@ February 6, 2013 11:05 AM in Considering hydronically heating tub walls

with 30+ years of experience and a couple of patents tells me that filling the void around a tub completely with dense-packed cellulose does wonders for both tub heat retention and also gets rid of that cheap-sounding thump you get when you step into a polymer tub.

thanks for that

@ February 6, 2013 10:56 AM in Antique Toilet

I'll keep it on file.  Plenty of pre-1940 (roughly when they switched to CI bends here) building about.

When you say "B tank" I assume you're referring to air-acetylene?

primary/secondary or direct

@ February 6, 2013 10:40 AM in Job pics!

They start out with primary/secondary since it makes proper circulator selection (and consequent minimum flow rate) simple.  Four pages later, one finds:

System Piping - Through Boiler
In new or retrofit applications in which primary/secondary arrangement is not utilized, the PRESTIGE Solo allows this flexibility due to a lower boiler pressure drop, see Graphs 2 through 7 on pages 91 through 93.
Figure 11, page 22 illustrates a multiple zone valve system with a single system/boiler circulator. A by-pass loop with a pressure differential valve must be installed on the system piping.
Figure 12, page 22 illustrates a single zone utilizing the boiler circulator as the system circulator.

Both topologies have their uses.
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