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Joined on October 13, 2004

Last Post on July 27, 2014

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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?

Thank you

@ March 31, 2014 9:28 PM in Navien 240 combi installed - I have concerns

I knew ther was a 1/2" bottle neck in there somewhere from the street to inside the house.

Still a little confused when you say 1/2" runs off the prv to the Navien. So the cold side is 1/2" to Navien, and all cold side on fixtures. So when you ran new 3/4" pex you tapped into the 1/2" for your distribution lines of 3/4, and then back down to 1/2" to the fixtures?

1/2" to house

@ March 31, 2014 8:13 PM in Navien 240 combi installed - I have concerns

1/2" from water meter feeding house either way the distribution line needs up sized to 3/4" min.

Im confused. By the op Around here when the city recons a street with new sewer, and water new water lines get run to the house. So maybe I'm misunderstanding when he said he had to dig up the line a few posts back.

psi, and 1/2" line, and volume.

@ March 31, 2014 6:30 PM in Navien 240 combi installed - I have concerns

Cmon really fellas You need the volume to go with the pressure. Only get so much through 1/2" pipe.

Paul where are you getting that high of GPM in 1/2" pipe of any type?

Ditch the 1/2"

@ March 31, 2014 1:20 PM in Navien 240 combi installed - I have concerns

You will never have decent flow to multiple fixture simultaneously until you increase your line size from the main. I don't care how much city pressure you have. I would size 1" since you will be doing it.

1/2" waterline

@ March 31, 2014 6:01 AM in Navien 240 combi installed - I have concerns

Is the problem. Are you sure about this?

Radiant ceilings

@ March 30, 2014 7:48 PM in Hydronic radiant heating subtleties

Are wonderful, and would do well in sleeping areas.

Maybe supplement the bath with over the top electric radiant floors would be an elegant touch.

As for the cooling aspect you would still need a means of dehumidification (ductwork) with any radiant cooling method unless you live in a arid region of the country. San Francisco would not be so. All though the duct sizing would not be as large as a conventional FA system.

Sounds like you are headed down the right path for what you want. Question is would a radiant design be more or less cost effect ice than your mini split quote.

Never doubt

@ March 30, 2014 12:52 PM in Navien 100,000 btu heating

What you know to be true.

I think this has been covered numerous time on Navien threads.

Thermal mass

@ March 30, 2014 11:07 AM in Radiant Roof snow melt ??

Of those surfaces can last quite some time after sun set in the summer. I would love to see the performance of Mad Dogs driveway when he gets it operational.
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