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Joined on January 19, 2012

Last Post on April 24, 2014

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I have had....

@ March 20, 2013 8:47 AM in Just Don't Get Modcon Boiler Pump Charts!

I have had this very discussion with Rick Mayo, the Denver TT trainer.He doesn't know why they put in the big circs either. It may be a CYA for people that pipe the boiler incorrectly. He stated correctly that, you should be shooting for a wide delta t. 20 degree or more. He also acknowledged that the tt 110 boilers cannot achieve that as packaged.


@ March 17, 2013 8:00 AM in IS THIS ENTRAN PIPING

I think your tubing froze and burst. I don't know what type it is. It may be pex-b. It does not look like entran. I would have someone chip the concrete and spice onto the tube. You can then pressurize them individually and see what you have. If the seller did not disclose the issue you may have recourse. The inspector also may bear responsibility.

cross connect

@ March 16, 2013 5:35 PM in mixing valve issues

Do you have a flow check between hot and cold.?


@ March 15, 2013 9:45 PM in efficient control wiring

What controls your secondary circulator?If it is a DPDT relay you should be able to use the other side to call the boiler.


@ March 15, 2013 1:41 PM in propane wall mount boiler

Of course you the boiler is oversized.
Yes, you would be better off with a smaller firetube boiler.
You would be crazy to toss out this boiler in the next 10 years.

You need to find a new service company. Period.
If they owned an analyzer and knew how to use it this problem would be solved.
The first thing they should have done is checked combustion and actual flue temp.
They still have not done this?
You may have a flow, sensor, or board issue as some folks have suggested. The actual flue temp and combustion must be diagnosed first.
There is a reason tech support won't continue with them.
You need to find someone who knows your boiler.


@ March 15, 2013 12:18 PM in Delta T issue

When you checked your flow rate were you using the circ or house pressure?
A delta t of 38 indicates the flow rate is too slow. It sounds like you either have longer tubing runs than you think or you circulator is under performing.
Can you read the footage numbers on the tubing?
My experience is that you normally see a delta of about 10 degrees at steady state in your type of system. That is with 200' loops pushing  just under 1 gpm each.
You are measuring the delta at the secondary right? What type of gauge?

Hot dawg LT

@ March 14, 2013 11:27 PM in Heating a partial exposed garage

I would look at a fan coil designed for low temps.
If you generally keep your slab at a steady temp, and you insulate the garage well, the radiant will work well. If you like to keep it cooler when unused, look at a fan coil.

Starting point

@ March 13, 2013 11:08 PM in Snowmelt Design

This should help get you started

Post Purge

@ March 13, 2013 8:57 AM in 100-270 Degree high limit aquastat (manual reset) keeps

What type of boiler?
What is the operating temp?
This problem can normally be solved by installing a post purge relay on the boiler circulator. This helps dissipate the extra heat after the cycle.


@ March 10, 2013 9:26 PM in HBCD

This subject came up in another thread.
I think it is worthy of it's own.

I recently forwarded this article from Dan's newsletter to my favorite insulation contractor.

They did some research into which products they distribute contain HBCD.
The "Bayseal" spray foam did not.
They were told that Dow "Blueboard" does.
They also indicated that all further requests for information were forwarded to  Dow's legal department.
 Does anyone have any additional information?



@ March 10, 2013 5:32 PM in Garage Slab Thermal Break

I am a little blown away that you guys are still using insultarp.

Why not just use visqueen? I think the real insulating values are similar and it costs less.
 Yes it is difficult to apply blue board to footings. I can be done. I also don't like the toxins in blue board. Closed cell spray foam works very well.

I intend no disrespect, but there is no science to support double bubble.


@ March 9, 2013 11:15 PM in Garage Slab Thermal Break

I was under the impression that insultarp has little real insulation value. It's just 2 layers of double bubble and a thin layer of compressible foam. It has been debunked and banned in my area. 2" ridgid is the only thing allowed.Perimeter insulation is required.
I like the ideas for capping the break.

good info

@ March 6, 2013 9:54 PM in Snow Melt Water Temps

I may try it a bit lower.


@ March 6, 2013 2:16 PM in Looking for feedback

At first glance the heaters cost about double.
The existing vent almost never works.
On demand requires 3-4 times the energy at peak usage. The existing gas or electric lines are often not big enough.
I would approximate the upgrade at 4X that of simple replacement.
I am getting ready to do one for my house. The gas line is big enough and it is an easy sidewall vent. It will still cost more than double with my labor for free.

It depends...

@ March 6, 2013 2:09 PM in Snow Melt Water Temps

It really depends on the design. We just did one with 3/4" pex at 9"oc. We used 2" blue board and centered the tubes. It runs really well at about 100-120. I tried it hotter and the heat was uneven. Lower temps also put less thermal stress on the concrete.


@ March 6, 2013 2:04 PM in Normal Height for Gypcrete Pour

The condition you have is very common. I think it is unavoidable. We normally glue wood floors over gyp. You could use a trowelable glue to fill the gap.

A little more?

@ March 4, 2013 10:41 PM in smoke detectors

Are you talking about commercial duct sensors? Household smokes? Flame rollout?
I little more would help.


@ February 27, 2013 10:19 AM in Automatic air vent operation - is this normal?

I think the problem has more to do with where the vents are. Do you have pictures


@ February 27, 2013 10:17 AM in I'm feeling lost

You do not have a condensing boiler yet you are running low temps. You may have to replace the boiler sooner than you think. Your boiler controller should be set so the return temp is always higher than 140.
Your low delta t and pipe erosion is an indicator that you are over pumping.
I think your future plan should be a mod/con boiler, ECM circ, and trvs on the interior radiators. Indirect for hot water.
You should be able to use the actual data from your chart for your coldest day to size your boiler correctly.

New problem?

@ February 22, 2013 4:12 PM in Living Room Cold (Hot Water System)

Is this problem new or is the system design flawed? A good heating guy takes the temp drop into consideration in his design.
Post some pics of the boiler and near piping.


@ February 22, 2013 4:07 PM in Steam/Thermosta/24V AC question

If you already ran a new wire along a clean path, it seems unlikely that is the problem. Are their any potential sources of interference near the nest?
I have no first hand experience with nest t-stats. I think your assumption that since it has it's own battery, it likely is just acting as a switch is correct.
I have found 24 volt circuits usually read about 27-28 volts


Pex b

@ February 22, 2013 2:42 PM in Can you tell me what kind/brand of Pex this is?

It looks like pex b.Is their any writing?
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