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gennady

gennady

Joined on January 27, 2011

Last Post on July 30, 2014

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Recent Posts

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cadet

@ July 5, 2013 2:26 PM in Lochinvar WHN vs Crest vs others

cadet has gianoni heat exchanger, i would avoid it. Also i really do not understand why Lochinvar created a brand to compete with its own line of WHN.

thermostat

@ June 26, 2013 11:23 PM in Who makes modulating non-Condensing Boilers

Forgot to mention, disconnect thermostats, as well.

zoning

@ June 26, 2013 11:21 PM in Who makes modulating non-Condensing Boilers

modulating boiler has a minimum stable load. usually 20-25% of max output. if you divide minimum load into smaller loads by using zone valves, you make modulating boiler to work in on/off mode or even short cycle, and vaste a lot of fuel. If you use TRVs, you create indoor reset, and exact load from room to room. This is the most effective and comfortable heating. But you have to use VFD constant flow pump for this.

Baseboards

@ June 25, 2013 8:18 PM in Who makes modulating non-Condensing Boilers

You have to loose zoning it kills efficiency dead. Install TRVs Instead. Then install small mod con.

Terminology

@ June 17, 2013 7:02 PM in High Efficieny Gas Boiler Recommendation

Energy star compliant and 360.000 + btu? Are you building an apartment building?

name

@ June 17, 2013 3:29 PM in How the Europeans do it?

John, I do not want to bring in the names. It is confidential. And it is not really important.

Training

@ June 16, 2013 3:20 PM in How the Europeans do it?

You can bring horse to the water, but you cannot make this horse to drink water. Contractors are unqualified not because they are stupid, but because they do not need to be qualified.

Training

@ June 16, 2013 3:03 PM in How the Europeans do it?

They started production of 3rd generation and us certification would cost a few millions. With 2 reasons I mention in my post they did not feel it was financially sound to continue. The point I'm trying to make is: the root of our industry problems is in low cost of energy to American consumers, it makes efficient but more expensive equipment non competitive. All other issues are just consequences. Just my 2 cents.

American market

@ June 16, 2013 2:36 PM in How the Europeans do it?

A week ago I had dinner with group of people associated with well known manufacturer. I did some installations of their excellent, innovative and well ahead of time equipment. They invited me to let me know they are stopping offering their equipment in US market.
2 reasons:
1. They could not find qualified contractors to install and service their product
2. Complete lack of interest of American public in their product.

They increased their sales in Europe, Asia and Japan.

I felt humiliated.

Market

@ June 10, 2013 11:18 PM in How the Europeans do it?

Is a leveling ground. When customers are settling for low grade cheap installation and service the heating field cannot compensate talented youths and offer them good career, then only uneducated school dropouts filling in positions. And circle of this mess gets completed.

Air vent

@ June 8, 2013 9:37 PM in EDR?

Just move air vent down. It is too high. Only half of the radiator is working.

Boiler

@ May 27, 2013 10:08 PM in Mr.

Standard efficiency boilers are thing of the past. They are sized to the worst case scenario, and this worst case happens only few days a year. The rest of the time standard efficiency boilers just wasting fuel. Contemporary modulating boilers matching load exactly for any given moment when set up properly. Proper installation is essential but setting boiler properly is even more important. 15% savings is a nonsense number. If there is no saving of 70% or more on oil to gas conversion with mod con then you can ask installer for refund. He did not do his job.

Distance

@ May 27, 2013 9:53 PM in Boiler vents - I must be missing something

Distance between supply and exhaust in most cases must be no less than 12". But in new construction usually plumbers and engineers are ignorant in respect of proper boiler installation. So what you see is a least of their heating problems. It is called " builder grade" construction.

Pump slow down

@ May 20, 2013 11:31 PM in Direct Return Pump Question

Pumps slow down will lead to increased effect of gravity circulation. So top floor radiators will get the most of the flow. Make sure top floor radiators have working valves.

$$$

@ May 20, 2013 10:33 PM in Reverse Indirect

They are about 80% more $$ compare to same capacity regular indirects.

Flow switch

@ May 20, 2013 10:16 PM in Gas Boiler Pump and Zone Locations

How can it be? Even with swapped sensors , there is a flow sensor.

How do you compete?

@ May 20, 2013 8:48 PM in I have noticed more and more shotty work

Everybody competes on its own level in its own market.

reverse indirect

@ May 20, 2013 11:32 AM in Reverse Indirect

Reverse indirect is in effect external DHW heat exchanger. it has high peak capacity and lower storage capacity then conventional tank. to size it as a buffer tank will be at least double price compare to indirect water heater. On commercial jobs i use inverted indirect as inter-cooler to bring boiler return temp down.

Boiler pump

@ May 20, 2013 6:47 AM in Gas Boiler Pump and Zone Locations

Boiler pump must be either flipped or relocated to right. If you want to relocate boiler pump, then flow direction must be into boiler. If you want to leave where it is, then just flip it. System pump installed on the right, pumping down might work although not kosher. Just keep system pressure on the high side. You might have air elimination issues.i would recommend moving them to the left pumping up.

Boiler pump direction

@ May 19, 2013 3:25 PM in Gas Boiler Pump and Zone Locations

Reverse flow on the boiler. Bummer. Pump mut be flipped. This installation is really out of wack.

Flow direction

@ May 19, 2013 12:53 AM in Gas Boiler Pump and Zone Locations

It looks like system flow is from right to left. Moving 2 system circulators to left pumping upwards might correct installation. Still not going to make it better, but closer to right one.

ugly

@ May 18, 2013 10:47 PM in Gas Boiler Pump and Zone Locations

This is one of ugly looking installations, but as i can judge from the picture only one thing needed is relocate 2 system pumps to system supply side, there might be other issues, but photos are not very clear.
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