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Joined on December 29, 2008

Last Post on July 29, 2014

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Those Temps

@ January 8, 2014 11:27 AM in Hot water baseboard heating

Are boiler supply and return - What about system side supply and return? At the same time.

Hey Bob

@ January 8, 2014 11:20 AM in Hot water baseboard heating

What disgust me about this entire ordeal. Nobody measured system side delta's at all. Everyone went right to the boiler. Dumb move if you ask me. Not too hard to figure out what your delivering out of the boiler and out of the system. The misconception that the boiler side is what your getting on the secondary side shows lack of hydronic understanding IMO.


@ January 8, 2014 11:16 AM in Hot water baseboard heating

Flow rate with 180 degree water its 560 for SunTemp - Not sure what brand. Thanks for the math correction on the footage..

Capable Output

@ January 8, 2014 10:00 AM in Hot water baseboard heating

103 ft of board is 103x 560x = 57,680 btu/hr - Now break it up into the zones. I'm keep preaching it, need boiler supply, return temps and system supply, return temps.

Install The

@ January 8, 2014 8:05 AM in Hot water baseboard heating

Optional system side supply sensor offered for the Alpine. This way the boiler will reset off the system supply not the boiler supply temp.

You Do Realize

@ January 8, 2014 7:41 AM in Hot water baseboard heating

That just because the boiler may be making 180 degree water doesn't mean that its in high fire nor does it mean 180 degree water is going out to the system side. For the 100th time, your piped primary secondary.

There is no Way

@ January 7, 2014 9:49 PM in Hot water baseboard heating

There should be TWO SUPPLY AND RETURN TEMPS NOT ONE....The boiler is piped primary secondary, in essence two separate systems. The boiler or primary side delta-t is constantly changing, ie, modulation.. They system of primary side will have a different delta-t. It is 99.9% mathematically impossible for both sides to have the exact same supply and return water temp. Here is the reason why.

The boiler/primary side has a fixed speed pump that the boiler mfg sized to move a specific flow rate each and every time it fires, You cannot no matter how hard you try change that. In this case its moving 7.3gpm in an Alpine 80.

Your system/secondary has its own flow rate dependent on what zone or zones are calling and that is always changing. The other factor is the system side pump. It again is a fixed speed pump and is always going to operate on its operating curve. In a multiple zone system one, two or maybe all zones are going to be over pumped.

In order for you to have a 20 degree delta out of that Alpine you would have to to be in high fire constantly, move the entire 7.3gpm out of the primary/boiler side into the secondary side, the secondary side would only need exactly 7.3gpm at all times and you had perfect matching boiler and system delta-t's. The odds of all this happening in harmony at all times is scientifically and mathematically impossible.

The question is when all heating zones are open and calling. The system side supply and return temps should be taken at the system side of the supply and return closely spaced tee's

1. What is the boiler supply temp
2. What is the boiler return temp
3. What is the secondary/system supply temp
4. What is the secondary/system return temp

From the pics the indirect looks to be piped on the secondary side. You then shut off the heating zones, open the indirect zones and take another set of readings. I have to say that I'm surprised but again we are only hearing your side of the story.

So Nobody

@ January 7, 2014 9:47 AM in Hot water baseboard heating

Has done any system side supply/return water temp measurements at all? That would be ridiculous in my opinion if they haven't. Boiler is working, making energy, making hot water. So the issue has to be on the system side not the boiler side. Without these readings how would anyone know what's going on? They wouldn't. I'm very surprised nobody that has been to this job hasn't taken delta-t/temperature readings on the heating and DHW system side. Delta-t is the difference between the supply and return temps. Since your piped primary secondary, the boiler/primary side would have a different delta-t the the system/secondary side. How would anyone know what the btu/hr delivery is without these readings.

gpm = btu/hr / (delta-t x 500)

Through This Entire Ordeal

@ January 7, 2014 9:18 AM in Hot water baseboard heating

And I've read every post. Nobody has done a heat loss calculation, nobody has measured system supply temp while comparing the btu/hr ouput of the board and/or DHW at those temps. Everyone keeps going to the boiler control to read temp. Has anyone done any system side supply/return readings as well as DHW supply return readings. Are you over pumping? What are the delta-t's. Nobody has started with the basics, everyone keeps running to the boiler. What's the delta-t on the boiler/primary side? This sounds like a hydronic problem not a boiler problem..


@ January 4, 2014 9:17 AM in Vitodens 100-W temp setting question

The outdoor sensor and set a curve.

No Sensor

@ January 4, 2014 7:46 AM in Vitodens 100-W temp setting question

Means no reset, means no turning down. Boiler is just riding the curve at that dial setting.

There's Much More

@ December 28, 2013 8:17 AM in Looking for resources

About high efficiency systems then the boiler, The Boiler is just a heating plant that makes energy. As others have said all that information is available on the boiler mfgs web site.

I'd say, that the design side is even more important then the plant itself but to be a good designer you need to understand hydronics. I'd suggest you start with these great tools from our friends at Caleffi. These great resources should be on every professionals bookshelf.

Another suggestion is for you to join the Taco Flo Pro Team and John Barba's Neighborhood at

Here's The Fact

@ December 19, 2013 7:21 AM in Boiler blues in NYC

He was not under contract to perform any services. The service you received and advice at this point was free. You also had the ability to call as many contractors as you wished if you were not happy with the delay.

Now take your ball and go home, mommy has some oatmeal on the table for ya.

Do You Think

@ December 18, 2013 1:21 PM in Boiler blues in NYC

With your attitude and eagerness to utilize facebook and other social media sites when you don't get your "I want it now" way, your going to find a professional to fix your installers mess? Not with a ten foot pole. Just by posting here, the contractor network will be on the lookout for your phone call.

PS...That service you did get, WAS FOR FREE!


@ December 16, 2013 2:10 PM in 6 Heaters - need one programmmable control

I'm very surprised. Where are you located?

I'm Sure

@ December 16, 2013 1:43 PM in 6 Heaters - need one programmmable control

If you ask them who the local rep is they will give you their number. I'm sure the local rep will give you a qualified contractor in your market.


@ December 15, 2013 8:22 AM in What is the most effective way to handle a MODCON

All the buffer is really doing is allowing the full boiler flow rate a place to go no matter the modulation rate. The pump is fixed speed. If you had a variable speed pump being controlled by the boilers control logic to match the modulation rate based on the systems demand that issue goes away and there would not be a need for the buffer tank.

Biggest Issue with ModCon's

@ December 15, 2013 8:00 AM in What is the most effective way to handle a MODCON

Here in the great USA. Fixed speed boiler pumps. They are the main cause of short cycling most of the time, the reason for elevated stack temps and high boiler return water temps when zoning.

Get variable speed boiler pumps controlled by the boilers logic to match its flow with the modulation rate of the boiler and they go away. The attached chart is provided by one mfg as the modulation rate in comparison to efficiency in its boiler. I don't know anyone else that publishes this.

Based On Other

@ December 14, 2013 3:51 PM in Triangle tube not reaching setpoint

Posts he has participated in its a PT110.


@ December 14, 2013 3:29 PM in Triangle tube not reaching setpoint

Its time to speed up that boiler pump. What the heat loss of each radiant zone and the baseboard zones?

Going back to your original post. Boiler supply 140 Return 108 - 32 Degree Delta-t

(Speed 1 Flow Rate is 6.5 or so x 32 x 500 = 104,000 btu/hr. Boiler Heating Capacity is 99,000 btu/hr. The 6.5 may be a little off, estimating off a graph.. I'd say the boiler is in high fire..

Deleted Duplicate

@ December 14, 2013 3:26 PM in Triangle tube not reaching setpoint

There's The Problem

@ December 14, 2013 11:14 AM in Triangle tube not reaching setpoint

Baseboard is on the last zone, slab is taking all the flow rate (ie, btu/hr) and the board zone is starving. Like I said 360 btu/hr per ft at that .5gpm flow rate - How many feet of board on that zone and is 360 x footage = btu/hr enough to get you to setpoint at design temp based on that zones heat loss?

Pull your triangle install manual page 82. On speed 2 the pump curve crosses the HX curve at at just about 9gpm.
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