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Joined on January 27, 2011

Last Post on August 30, 2014

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@ January 26, 2014 9:49 PM in does this system look right?

This system is piped completely wrong.
-no point of no pressure change.
- boilers are piped in a way that their pumps are pumping into itself. i do not see system pumps
- differential pressure bypass is in wrong place.
and so on

whole thing looks like a joke


@ January 26, 2014 1:29 PM in rinnai hot water help

Sorry , I misread your question.

water heater

@ January 26, 2014 10:00 AM in rinnai hot water help

Water heaters are not boilers. They cannot be used as a boiler, Ask original installer to install real boiler.


@ January 26, 2014 9:40 AM in Converting a 2 pipe radiator system to a 1 pipe or staying with 2 pipe- Any thoughts

I would definitely not recommend monoflo. No way. I would organize system into type of load, high temperature, medium temperature and low temperature, and pipe them with primary secondary, high first and low temperature last on the flow. I would do separate outdoor resets for each load. Also, you mention on measuring radiators to determine load. How do you know those radiators are sized properly? What was the name and qualifications of the person who designed and installed them? Just do proper heat loss and remember radiant system produce lower air temperature and generally requires probably 30% less input than convection system.

savings projections

@ January 19, 2014 10:40 PM in Calculating savings with degree days

I usually under estimate savings. Real life savings sometimes surprise me as well. There are more factors affecting savings other then just HDD calculations. And those factors are really impossible to predict. Main factor is ability of the boiler to follow load without overshooting. Proper set up of PID, where access is available, becomes essential. Another factors in modulating condensing boilers is avoiding boiler stopping and short cycling. Just my 2 cents.


@ January 19, 2014 6:51 PM in Calculating savings with degree days

In my understanding properly sized boiler will run non stop at design degree hour. So having heat loss done and knowing how much BTU is lost at these conditions, I multiply total hours of degree day per year. I get these at , then I get fuel usage per year based on those numbers. Then i deduct hot water fuel usage from customer bills, and get annual savings with new equipment.

design day water temperature

@ January 16, 2014 9:12 PM in New Lochinvar Knight Questions / Concerns

Radiators and baseboards are rated based on average water temperature. With delta T 20F, entering water temperature 160F, we have 150F AWT. with 180F entering WT we have 170F AWT. Looking at Governale gov-free radiator we see that btu per square foot of EDR will be 150 for 170F AWT and 110 for 150F. Now, there is a question if existing radiators will emit enough BTUs to cover heat loss at 160F entering water temperature. Also we have to consider that piping is not insulated and probably there never will be 160F at radiator.

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.
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