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Joined on October 13, 2004

Last Post on August 20, 2014

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38k all day

@ May 2, 2014 7:06 AM in List of small mod/cons

No matter the outdoor temp.

What your design temp is plays a lot into this. Control strategy also etc ODR.

Example being mild consistent winter temps verses wild load swings through out the heating season.

Curt's hypothesis

@ May 2, 2014 6:32 AM in List of small mod/cons

Holds a lot of water. One has to look at system as a whole small zones verse single zoned systems. Micro zones can kill boiler efficiency.

heatpro the ability to modulate to the load means tons in savings verses the added condensing efficiency. It is also deeper than 85 verse 95 percent efficiency. A bang 100k btu fire no matter the load burns more than coming on line at 25k to match the load.

Peoples claims to saving, or the lack of has to be taken with a grain of salt. Most people just look at the bill with out realizing gas cost difference, or weather from year to year.

Big showers

@ May 2, 2014 6:19 AM in Shower

Can be fun designing. Think shower seat with a little radiant touch for the tosh , niches for bath products, and a foot niche for the ladies about 12-15" up to shave their legs. Lots of possibilities.

Radiant shower walls

@ May 1, 2014 5:58 AM in Shower

Along with the floor.....Cozy. You may not want to come out.


@ April 28, 2014 6:27 PM in Never seen this before

The new owner has no heating system now. I would say the scrapers took anything they could get with a sawzall.


@ April 27, 2014 8:59 PM in Are you in the market for a Thermal Imager?

From a production stand point it's probably much cheaper to make them all with same components, and disable certain functions than to produce several different lines with differing functions, and components. Pretty smart really. Who wants the best options buys them with out even knowing their really all the same. I wonder how the cat got out of the bag.

Think of it this way most modcon boilers have two or three sizes where the HX is the same size but btu outputs differ what changes to make them different is really not much for the cost differences.

Surface area of stranded

@ April 27, 2014 2:38 PM in Thermostat wire

Like techman said.

Interesting debate

@ April 26, 2014 8:37 AM in Mark vs Martin

I find glazing alone to be of interest in itself. A 56* surface temp double glazed verses a 63* st triple glazed does not do much in reducing the MRT influx to the human presence in front of the window. For the cost difference between the two glazing assemblies. Money is far better spent in quality insulating window coverings if energy reduction is the goal since your lowest outdoor temps are usually at night there is not much to look at outside. Window covering are usually implemented in most decor anyway.

My interpretation

@ April 24, 2014 6:13 AM in Sizing

Of which output number to use is if the boiler and piping is in a conditioned space use DOE output, if the boiler, and piping is Not in a conditioned space use I=B=R.

A heatloss should always be done regardless, and has no bearing on which output number you use.

Not disagreeing with Alan just trying to point out the difference between the two output numbers.


@ April 18, 2014 9:26 PM in CPVC in hydronic heating system

Would be the question, unless your sitting on a mountain of free stuff. Along with what Kcopp points out. Pex is a much easier pipe to work with.

Not surprising

@ April 18, 2014 9:21 PM in PEX pipe split (hydronic)

If what you think happened actually did. I'll bet Weezbo could share some frozen anomalies.

Note 100 psi rating at 180* probably a 2:1 safety factor. The power of ice.

In other words

@ April 13, 2014 6:20 PM in disconnecting power to clean AC coils - why necessary?

Lock out tag out.

Water turbine gen.

@ April 13, 2014 6:18 PM in Can a Circulator Pump Past a Stopped Downstream Pump?

To cancel out power used in the hydronic system. Even if it reclaimed something. System is circulating anyway.

Black and White

@ April 12, 2014 8:06 PM in Are you in the market for a Thermal Imager?

What they are doing is hacking software. Illegal.

Maybe you dont agree with how Flir pays for their R&D. I think its a brilliant move in manfacturing the camera. The only thing that changes is upgrade in software which is built in.



@ April 12, 2014 12:21 PM in Multicirculator/Multizone

Balance valves in that scenerio is a band aid for poor piping practice. You'll end up with poor performing pumps, and wasted energy. If that method would even work. Kind of a setup for unintended consequences. JMO

Edit: With little info, and no pics, I would also check the math on the circs in place.

Very creative

@ April 12, 2014 7:25 AM in What do you think of when somebody says Hydronics?

So what brought about the initiative Harvey?

How many head?

I still think the dairy farmer gets screwed for what we pay for a gallon of milk, and the work involved to get it off the farm. A 365 day a year job twice a day never stops. Tell your brother thank you for what he does.

Be Safe

@ April 11, 2014 10:37 PM in disconnecting power to clean AC coils - why necessary?

Yes its weatherproof, but then not many people hang on to a condensor unit in the middle of a rain storm. Plus cleaning will probably throw water into undesirable places a rain would not reach. Its just a safe step to follow.

Dont mean to cut in

@ April 4, 2014 6:38 PM in Problems with Open radiant floor system

And I'm sure you are tired of hearing about open systems.

You seem to have educated yourself some what on this topic. Some points you are missing.

Legionella just loves the temperature you run your system at in the winter time. 130 plus degrees is what you need to eradicate legionella this takes a period of time the higher the temperature the less time needed. This lowers the bacteria population, and does not 100% eliminate it. Just brings it down to acceptable limits. Also while legionella does not bloom in 40-70 degree water it is ever present, waiting for the right conditions to propagate in your system.

While most healthy people may never contract it. The point is why take an unneeded risk to the added exposure. Much easier to contain a sole purpose domestic water system with considerably shorter runs of pipe than a combined system with much longer piping for bacteria to hang out.

Also how old is your system while it may be bio free now, think about decades from now. My radiant system is over 60 years old with 5000 feet of pipe it makes me want to yak at the thought of my fresh water being handed to me through all that pipe if it were an open system.

another thought is future owners, or visitors that may be handed your system with little knowledge of its possible health hazards. They may be the ones that are elderly, or have deficient immune systems.


@ April 3, 2014 5:21 PM in Stinkbugs


Thermal mass

@ April 1, 2014 12:05 AM in Hydronic radiant heating subtleties

Yes you are correct about the slab taking some preheat time. Even if you did an over the top electric it would still take time. If usage patterns are not predictable then the gas heater would be the most responsive choice.

So if your 3/4" line

@ March 31, 2014 10:55 PM in Navien 240 combi installed - I have concerns

Has a 1/4" kink in it from the street to the house that does not make a difference?

This could go everywhere. My point is if your using multiple fixture simultaneously you need volume to the fixtures the closer to the fixture you reduce down the better. It would drive me nuts to have to use one fixture at a time or there will be war crystal from the shower stall.

Patio sandwich

@ March 31, 2014 9:41 PM in Hydronic radiant heating subtleties

I would do both floor, and ceiling. Concrete with out tubing is a missed opportunity. Especially if bare feet are engaged. How high is the ceiling?
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