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Joined on January 27, 2011

Last Post on July 26, 2014

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Dankirk boiler

@ January 12, 2014 8:45 PM in Dunkirk boilers

We installed few of their boilers with no problems at all. Excellent product.

delta T

@ January 12, 2014 8:36 PM in Is envelope heat loss linear to inside/outside delta T?

Delta T is difference between 55F and outdoor temperature. 55F is design temperature of the envelope of the house. Heat is lost from envelope of the house to outdoor. But huge factor in heat loss are infiltrations. They might be larger than heat loss trough the envelope itself.


@ January 12, 2014 10:19 AM in Why not a zone for every room?

If you want to zone each room separately, you need to install TRVs on each radiator. steam or hot water does not matter. It is called indoor reset.

24 v

@ January 10, 2014 10:03 PM in Weil-Mclain Ultra 3 blows 3 amp and Limit Open error

you have a problem in low voltage section. 3 amp fuse is protector against short in low voltage circuits. disconnect low water cutoff and install original plug p12 or just check low water cut off harness on short and continuity. if harness is ok then check LWCO. you can jump its contacts if you can determine them. do not short power to low water cut off. Also those electronic low water cutoffs used by weil mclain need good ground. if protector is affecting the ground then LWCO will not work and will give you these messages. Check if boiler mechanical ground is connected to panel ground.


@ December 22, 2013 4:30 PM in Recommendations for new flue gas analyzer- URGENT!

Testo is excellent analyzer


@ December 7, 2013 11:39 PM in Rotation Indicators

With frozen shaft pump gets overheated and turns off internally. It manifests itself as no rotation on energized pump. It is a good tool for wet rotor pump troubleshooting as well.


@ December 7, 2013 2:18 PM in Copper Press Fittings

Went with propress 5 years ago and never looked back. Pressing up to 4". Now waiting for carbon steel mega press to be available.


@ December 7, 2013 2:13 PM in Rotation Indicators

It is on my key chain. And it shows actual pump rotation. Of pump is stack, it will not turn. Also works on solenoid valves.

Delta t

@ December 7, 2013 2:10 PM in Taco Bumblebee Circulator

You can try to slow down water flow by playing with ball valve on pump discharge. It might bring pump to the controllable range.

shutting feeder pump

@ December 1, 2013 10:29 PM in Steam Boiler Flooding

do you have working check valve on feeder pump? it is possible that condensate back flows from boiler to the tanks trough feed line if check valve is broken.

boiler feed tank

@ December 1, 2013 10:25 PM in Steam Boiler Flooding

feed pump mounted on the tank is controlled by low water cutoff /feeder combo, or similar device mounted on the boiler and in case of low water conditions starting the pump to feed boiler to proper level. Also on the tank you have to have float switch preventing pump from operation in case of low water level in the tank, and same switch or additional one to turn on solenoid valve mounted on water feed line feeding tank, not he boiler directly.
hope it helps


@ November 27, 2013 11:10 PM in best temperature for Cast Iron Radiators

just install TRVs on each radiator and set your temperature room by room.


@ November 16, 2013 10:23 PM in Viessmann

I would not be surprised. In general US market is resisting high efficiency boilers at all levels. New technologies like co generation and tri generation are not accepted in USA and Viessman does not even consider to introduce it to US market. So, what they going to show off? Their condensing boilers? it is yesterday technology and this yesterday is not even today here.

Pop safety valve

@ November 14, 2013 7:45 PM in Testing a 15psi pressure safety valve on my boiler

Testing is done by insulating supply and return lines ( valves had to be installed by boiler installer). Then you have to jump pressuretroll and manual reset pressuretroll if it is installed. Then you turn thermostat all way up or jump it as well. Watch steam gage. Valve must pop open at 15 psi sharp. Also the best thing to do would be to hire professional for this testing. Do not do it yourself.


@ November 4, 2013 6:53 AM in CO Generator

Look at the bright side. It is 100% efficient.


@ November 2, 2013 8:26 AM in danfoss ra2000: how do I reverse?

just relocate trv to another radiator port


@ October 27, 2013 9:12 AM in Ex tanks problem

are those boilers piped as shown in attached diagram?

Night setback

@ October 27, 2013 6:57 AM in outdoor reset and thermostat setback

You have to have remote viessman control unit instead of thermostat set to reduce mode with schedule programmed in. Regarding second zone, you need another control unit with mixing valve installed and programmed. Just shutting boiler or zone valve on outdoor reset system will lead to very long time to get to desired zone temperature after turning zone on.


@ October 24, 2013 10:16 PM in Bosch Greenstar Combi 100 / Not sufficiently heating three zones

I do not want to sound negative, but workmanship here is not acceptable in my opinion.
I do not see acid neutralizer on condensate drain line.
I do not see BFP drip line extended to no more that 6" AFF
I do not see min 18" before and after air scoop
I do not see isolation and drain valve on expansion tank
I do not see DHW mixing valve
Just to name a few


@ October 23, 2013 8:06 PM in Bosch Greenstar Combi 100 / Not sufficiently heating three zones

Why are you acting as you want to troubleshoot your brand new installation? Where is an installer? And all this installation looks like nightmare on elm street movie.

qualified tech

@ October 23, 2013 7:41 PM in We're falling behind

There none. And the ones who willing to learn are not capable because they are uneducated. And social level of heating technician or plumber is so low, that only leftovers of work force are forced into this trade. Then "do not shoot the piano player, he plays as he can".

dual setting aquastat

@ October 22, 2013 9:54 PM in aquastat setting

hi is a boiler limit, set at 180, lo is to prevent condensation, set at 140. lo is preventing circulator from pumping constantly cold water trough the boiler. it allows to heat portion of the water at the time.
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