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Joined on January 27, 2011

Last Post on August 19, 2014

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design temperatures

@ April 3, 2012 10:01 PM in Happening elsewhere?

Boiler works at design temperatures may be total 1 week in a year. Most of the times boiler works at much higher outdoor temperatures, and it allows to lower water temperatures, and it permits boiler to condense.
Radiation , installed for design temperatures, becomes over radiation at regular temperatures.


@ April 1, 2012 6:15 PM in Happening elsewhere?

look into hamilton engineering products. they have multiple boilers with combined vent. they made it as single boiler product, but there are actually more than 1 boiler in the set.

taco 010

@ April 1, 2012 6:08 PM in Boiler making loud noise when filling storage tank

.taco 010 has 10' WC head available .¤t_category=52
your storage tank has 7' WC head.

your boiler ( i found it to be low end BTW) does not publish head data for heat exchanger, But for gianoni heat exchanger it is somewhere in 20+ feet of WC. Add to this some piping and fitting, and i think you have to move to next big pump. you have probably lack of water flow, and water starts to boil in the boiler, and because this boiler does not have advanced protection features, you might damage this boiler. I might be wrong, but this is my opinion.


@ April 1, 2012 5:59 PM in Happening elsewhere?

i would offer indirect off new boiler.


@ April 1, 2012 5:40 PM in Happening elsewhere?

There is always ways to vent, just for each application there is proper equipment. If there is vent for atmospheric boiler, there is vent for direct vent boiler.


@ April 1, 2012 5:34 PM in Boiler making loud noise when filling storage tank

Also, on last picture i see probably piping to the indirect heater (left pump) before twin tee connection, but i do not see 2nd connection there. do you have picture showing indirect piping in more details?


@ April 1, 2012 5:30 PM in Boiler making loud noise when filling storage tank

could you provide pumps numbers (like 007 or 011) and speed they set to?


@ April 1, 2012 4:08 PM in Boiler making loud noise when filling storage tank

what circulator is installed for indirect tank?
what size piping installed for indirect tank?
on what side of hydro separator indirect is piped?

Re: professional engineer

@ March 30, 2012 9:25 AM in Steam or water system for old Hotel

I did remove this post and do apologize for it.

design fee

@ March 30, 2012 7:42 AM in Steam or water system for old Hotel

You are absolutely right, design fee must be charged. we do it all the time , except the job is standard and repetitive, and some options can be included in proposal. we always charge fee for complicated or non standard jobs.

modcon efficiency

@ March 29, 2012 9:46 PM in Steam or water system for old Hotel

the main difference between conventional heating systems( hot water and steam ) and condensing modulating boiler is not in a boiler efficiency , but in system efficiency. Modulating boiler tracks load very tight, no overshooting at all, and provides exact heat as needed, while standard systems always overshoot the set points.

water meter

@ March 21, 2012 11:06 PM in Electronic water feeder/lwco for WeilMcClain Model 80

just install small water meter on feed line


@ March 20, 2012 7:31 PM in Wanted - Heat Timer EPC panel for parts

Why don't you just make another cut out on the wheel?

gas meter

@ March 20, 2012 7:19 PM in OK

Gas meter is a property of utility company, and they are decision makers on what size meter should serve your house.


@ March 20, 2012 5:45 AM in What do you think of

I used to work at power plants, and did a lot of services on economizers , which are integral parts of power boilers. I think what needs to be controlled is a dew point, up to chimney outlet, and negative pressure from firing chamber all the way to chimney outlet. This leads to complicated design issues, and with properly set up boiler there is not much heat to recover without damaging chimney and boiler.

project cost

@ March 18, 2012 6:55 PM in Lochinvar Knight boiler problems

Are you saying, you paid $38,000 for this mess?

mod con

@ March 15, 2012 11:10 PM in Condensing vs Modulating / Condensing

WM GV+ not modulating , does not have outdoor reset, it is just cast iron weil mclain with stainless steel cooler on the side, why bother, just install regular hot water standard efficiency boiler , they prove to be easy sell, proven 50 year old design, and very cheap. WM come up with GV series as a mockery of high efficiency , just to give cheap boiler, with high efficiency rebates possibilities from utility company, so unqualified contractors could sell it under 90+ % efficiency to uneducated consumers. This puts a shame on formerly reputable boiler manufacturer.Just my 2 cents.

radiator sizing

@ March 15, 2012 6:50 PM in Lochinvar Knight boiler problems

This is what i mean. you calculated installed EDR, but how do you know this EDR is confirming to house heat losses? But in this case bigger is better. More radiation for condensing boiler is a very good thing. it allows to lower water temperature and make boiler condense more.

boiler sizing

@ March 15, 2012 6:43 PM in Lochinvar Knight boiler problems

I do heat loss on each job i do a few different ways, one using HVAC-calc software , another with fuel bills and heating degree day methods, and i developed a feeling of right and wrong. i never go by the feelings, but it helps. i have yet to see private house needed 400MBH boiler. I consistently scare customers with my sizing, putting in contracts paragraphs, saying that i will replace boiler to bigger one at my own expense, because i was proposing boilers much smaller than my competitors, and yet when in the past we had 6F days in NY i did not get any call with complaints. So, i would say even 125k boiler will be probably over-sized too, but you can live with that. Also get rid of zoning as well. it is messing up condensing and modulation on your boiler.I know, there few contractors agree with me, but this is how i do things.


@ March 15, 2012 6:11 PM in Lochinvar Knight boiler problems

you have to confirm to pump away principle, ( see book of same name by dan hologan), and if circulator is picked on 20F temperature differential, then divide BTU by 10000, will give you gpm of the pump, if 40F temperature differential picked ( this is strongly recommended for condensing boilers), then you need divide btu of circuit served by 20000, and pressure drop is length of loop, ( including baseboard) and then have 6 feet of water column pressure drop per each 100' . this is not exact , but will get you there. otherwise you have to do hydrolic calculations. or just get grundfos alpha and set it for autoadapt
Regarding sizing, you have to go with heat loss calculations, not EDR, do not forget to factor in infiltrations as well. You don't know who sized your radiators. ( might be the father of the fellow who over sized you boiler)


@ March 15, 2012 7:31 AM in Lochinvar Knight boiler problems


"output temp diff"

@ March 15, 2012 7:30 AM in Lochinvar Knight boiler problems

if water flow is not sufficient, at minimum load water is overheated and temperature difference on inlet and outlet of the boiler increase to much and too fast. boiler control protects heat exchanger and locks out. expansion tank and boiler feed line connected in wrong locations. boiler is over sized at least 3 times. and person installing it has little knowledge in those systems. Find a good contractor in your are to clear this mess. it is not a matter of problem within installation, this is a problem with whole installation.
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