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Joined on January 27, 2011

Last Post on September 11, 2014

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@ May 20, 2012 10:04 PM in trouble with a new system

What pump make and model?

It ran hot for a few days and then the same thing happened.
could you be more specific. it run hot for few days when all zones were turned off by the valves?


@ May 20, 2012 7:32 PM in trouble with a new system

How many Feet is the run? What is pressure difference at beginning and end of the run?
Please close all other zones and run system with only one problematic zone.see what happens


@ May 20, 2012 3:21 PM in Is this why we make fun of engineers

I actually refuse to do spec build jobs. And if I hear word "architect" from potential client, I walk away. Cannot waste my time on this BS. It is too depressing. I had a job for very high profile customer, where in emergency I installed 130,000 btu mod con combi in his brownstone, where heat load was 80.000 btu at design temperature and it went trough the winter with no problem, then renovation come in the summer, very "reputable" engineering company went in, recommended removing mod con boiler, ( they were thinking it was a water heater), and specified standard efficiency boiler 400,000 btu. I was fighting them to the blood, with no result, telling them they do not need this boiler. Customer wanted me to go with engineer recommendations. We agreed to leave existing combi boiler, and just add this new boiler . Phase 2 of construction were done already with out me. I see engineers as a major compromising factor in energy conservation. (I have a degree as well)

fan coil unit

@ May 20, 2012 11:41 AM in Is this why we make fun of engineers

Isn't it a standard steam fan coil unit?

2 bad zones

@ May 20, 2012 11:30 AM in trouble with a new system

Are those zones completely cool, or there is hot water at the zone valve at entrance to the zone?

micro CHP

@ May 20, 2012 11:24 AM in Viessmann Stirling heat/electrical generation...

In my opinion, It has absolutely no future in USA. Keep dreaming. The cost of energy is subsidized and low, and it prevents new technology implementation in USA.

done right

@ May 19, 2012 4:53 PM in Gas Conversion

good luck with that part.

gas conversion

@ May 19, 2012 2:17 PM in Gas Conversion

Most utility companies provide discounted boilers, price difference between burner and complete boiler is a few hundred dollars, considering need for chimney to be lined, and fact that most of the contemporary boilers come with damper and electronic ignition. i would go with complete boiler replacement. indirect heater will be very economical way for domestic hot water production. also burner has moving parts and this is more things to break.


@ May 19, 2012 10:58 AM in trouble with a new system

tell you contractor to install flow meters on those 2 loops and monitor flow conditions.


@ May 19, 2012 8:23 AM in trouble with a new system


2 zones shut down

@ May 18, 2012 9:43 PM in trouble with a new system

could you describe where those 2 problematic zones located in the house ?


@ May 18, 2012 9:41 AM in replacing heating distribution pipes with pex

In my opinion, if you went with atmospheric standard efficiency boiler, do primary/secondary piping, on system side install variably frequency drive pump in auto mode, install TRV, on all radiators, you can pipe radiators with manifolds or any way you want but if in series use bypass line with properly sized piping, install outdoor reset controlled valve on boiler side, outdoor reset system sensor install at system pump discharge. you will use boiler as a buffer tank as well in this configuration. do not use zone valves or thermostats in this configuration, or install 1 thermostat in coldest room, but you must not install TRV on radiators in this room. And using 1/2 pex the way you described is a very bad idea. you have to find a professional , not a handyman to do your heating system.


@ May 18, 2012 12:57 AM in Hot water baseboard heat

I do not think ceiling fans are good idea. By forcing hot air down you disrupt convection and will not able to heat the space. You need colder air to go down and hot air to go up by itself.


@ May 18, 2012 12:46 AM in Review by "experts"

My 5 cents on issue of qualifications of heating specialists, is that this profession requires a good level of knowledge in combustion, hydronic, electric and electric controls and so on. The one must be sharp and capable of thinking. Combined with low pay level and low acceptance in the society , this profession does not attract smart and sharp people. And also this person must be capable to come out of the bed at 2 am winter night to go and service the boiler. Seems it is too demanding job. smart kids go to college and then easy make 120K a year sitting 8 hours a day at some lehman brothers office, Why bother.

system cleaning

@ May 17, 2012 8:58 AM in Cleaning water boiler system before installing condensing gas boiler

for initial cleaning sentinel x400, for conditioning sentinel x100, disconnect old boiler first.


@ May 15, 2012 2:11 PM in Treasurer-Condo Assoc

It really does not matter what system better. Here in NYC, all what matters is initial cost of the job. Whoever gives lowest bid gets the job. Savings? Who cares, just give me new boiler. Cheap.

NY steam

@ May 15, 2012 1:56 PM in Treasurer-Condo Assoc

Their minimum charge $1500 per month.

copper baseboard

@ May 13, 2012 5:19 PM in gas boilers, which would you pick?

what material of radiator has to do with boiler efficiency?


@ May 13, 2012 1:25 PM in gas boilers, which would you pick?

this is the wrong question to ask. the right question is "how can i pick right installer?" good installer will give you few options to choose from, Regarding baseboars, they are just fine for condensing boilers as anything else. This is my opinion. The issue is amount of radiation in relationship to heat load. all houses are overradiated, as contractors tend to install excessive radiation, compared to design, and when baseboards designed for design outdoor temperature, these  conditions happen few days a year,  80% of time in the winter load is about 50% and less than design load, and it allows for lower water temperatures.


@ May 12, 2012 7:10 PM in boiler feed on or off?

if we build heating system from scratch, we do 2 tests, 1 air test 100psi 2 hrs, then water test 100 psi for 4 hrs. then we leave feeder on. in finished basements or in apartments we offer watts water detection shutoff as an option for additional fee.

boiler sizing

@ May 12, 2012 6:39 PM in Using an indirect HW with smaller boiler

In my opinion, indirect tank gives an excellent option to size boiler to heat load not to hot water. then tank sizing depends on domestic hot water requirements and nessesary recovery rate. I tend to increase tank size , not the boiler size if there higher hot water demand. It is especially actual when house is attached on both sides. Then heating load is much less than hot water load, and increasing boiler size will decrease overall system efficiency.


@ May 12, 2012 1:59 PM in Copper to steel/iron in a closed loop system

in this particular case somebosy installed galvanized nipple between copper adapter and stainless steel tank. we replaced it with brass nipples and it will last as long as tank will. 
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