Security Seal Facebook Twitter GooglePlus Pinterest Newsletter Sign-up
The Wall
Dan Holohan

Dan Holohan

Joined on March 4, 2009

Last Post on September 17, 2014

Contact User

Recent Posts

« 1 2 3 4 5 6 ... 539 »

GasNetworks show!

@ August 16, 2014 9:51 AM in GasNetworks show!

Dan Holohan returns to the GasNetworks Fall Training Conference

The Lantana
43 Scanlon Drive
Randolph MA
Thursday, September 25, 2014

GasNetworks will hold its 14th Annual Heating Professionals Fall Conference on Thursday, September 25 at the Lantana located in Randolph, MA.

The day-long conference will feature Dan Holohan and some of the best industry trainers and expert speakers and will focus on high efficiency natural gas heating, water heating, house control systems and installation best practices.

Preliminary sessions include such topics as Hydronic heating, System fluids, Sizing and ACCA Manual S, Condensing and modulating boilers, Emerging technologies and more.

Equipment manufacturers and suppliers will be on hand to display the latest in natural gas heating products and technology. A trade show and networking reception will be held at the end of the day.

Registration fee of only $75 includes: Breakfast, full conference, lunch and reception!


To register by phone: 1-877-363-8822

Thank you,
GasNetworks Training Committee

Thank you,
GasNetworks Web Team

One of the nicest kids I've ever met.

@ August 12, 2014 2:31 PM in Extra Life for Kids!

And what a miracle is he! Thanks for doing this, Chris. You're a good man to help people you don't know.

Posting answers from Scott:

@ July 25, 2014 8:36 AM in Radiant Heat Matrix Other Than Concrete.

Radiant Heat Matrix Other Than Concrete?

Underground tank temp? Typo 550*
Buried tank location? Under greenhouse hmmm one big emitter
Or remote?
Plants grown elevated, or in the ground?
A 500 gal tank would be darn near the
Size of the green house.


Temperature is typo; should be 55 degrees Fahrenheit.

The top of 3-ft diameter X 10-ft long tank, is 1 ft. below ground level (4 ft. total depth). So, tank water will be about average temperature of St. Louis = 55 degrees F. Tank is below greenhouse.

I’m raising ground surface by 2-feet with retaining wall and crushed rock (in-part over tank) to create pad for greenhouse, which has footing for granular material (not concrete). Building-up, so it seemed logical to install radiant PEX tubing. Tank water temp can be raised with heat-pump, solar, etc. Small area to heat, or cool (6 ft. X 12 ft.). Plants will be grown on shelves, or in raised beds.

Key questions:

1. Will crushed limestone (1/4” minus) work for heating matrix, using 1/2 inch PEX tubing? Will sharp rocks cause leaks?

2. Will crushed limestone transfer heat adequately to heat/cool greenhouse? [assuming other parts of system are working]. What about pea gravel or sand; which have more dead–air space?

Hope to avoid a concrete matrix due to greenhouse design and expense.

Thank You


Just wondering about oil tanks

@ July 22, 2014 10:03 AM in Just wondering about oil tanks

Does anyone know why they chose 275 gallons as the size for most houses?

Radiant Heat Matrix Other Than Concrete.

@ July 21, 2014 1:36 PM in Radiant Heat Matrix Other Than Concrete.

(I'm posting this for a member who is having difficulty getting online. Dan)

I’m building a small greenhouse (6’ X 12’) and plan to heat with a radiant system (1/2” PEX tubing), over insulation panels. Water will be circulated through a 500-gallon underground tank (550 F), which may be supplemented by solar heat.

Exterior radiant systems typically use PEX embedded in concrete, which will not work for my greenhouse. I considered pea gravel and sand, but these (apparently) have poor heat transfer properties. Would crushed limestone (1/4”- minus) work?

How thick should the matrix cover be over the PEX? (2 or 4 inches?). A thin cover will have a quicker response time (PEX to air temp.), but less heat storage capacity and insulation. Should I add “fins” to increase heat transfer?

Any ideas or comments are greatly appreciated!


@ July 12, 2014 12:40 PM in Suggestions for new forum

They registered with a US address.

May launch this month

@ July 12, 2014 10:35 AM in Suggestions for new forum

But we'll see. We've been working on this since February. I've spend the past several months moving the content, piece by piece. There's a lot of stuff on this site.

Vanilla captured the whole Wall in May and have moved the posts. They're currently working on moving the jpegs. It's a big job.

When it goes live, we'll be shut down for a day so that they can move the content posted between May and the launch date. When it comes back up it will have everyone's user name and password in place. New users will be able to sign in with Facebook, Twitter, LinkedIn, Google, etc. And the Wall will be open to the whole world. Right now, you have to be in the U.S. to post. You'll also be able to discuss every article on the site within the sections that hold those articles.

I think you'll like what's coming.

The new forum

@ July 12, 2014 5:58 AM in Suggestions for new forum

Thanks for the comments. Vanilla is building the new Wall. Here's a link to its features: I think you'll be pleased.

Right now, they're moving the content from here to the new site, which is also completely different. Stay tuned.

Very good question

@ July 9, 2014 6:19 AM in steam main size

I know the building runs on ConEd steam and that it's a vacuum system. The pressure is typically 1-1/2 psi, with a high of 3 psi on the coldest day.

The building was prefabbed and assembled more than built, with the materials needed on any given day arriving on that day. It took just 18 months from the time they knocked down the old Waldorf Astoria hotel until the first tenant moved in.

I'll see if I can learn more about the pipe sizes. Thanks, T.P.

What do you think of this new product?

@ July 8, 2014 9:39 AM in What do you think of this new product?

A friend from the U.K. just showed me this and told me to be sure to watch the quick video. We both expect to see it in Walmart before long. Love to hear your thoughts.

That was a good program.

@ July 2, 2014 11:59 AM in Dans Reading List

They did a good job of demonstrating what went on inside the boilers to cause the explosion. Mark Twain talks about his in Life on the Mississippi. Often, when sharply steering around debris in the river, a captain would tip the steamboat and cause an explosion when the water came back to level.

You're right about the ending. Had Lincoln lived, it looks like he would have been facing some serious questions. We know from Team of Rivals that he knew how to play political hardball. It's a shame some of that ended with this tragedy.


@ June 30, 2014 6:32 AM in One of the greatest heating tech' has passed away

You were a good friend to Chris, Scott. Well done.

False waterline

@ June 29, 2014 6:44 AM in One Pipe Steam - What Is This?

I agree. It would be good to know the levels of what's beyond the boiler room.


@ June 29, 2014 6:09 AM in Why was my thread deleted?

Some of the people posting on that thread chose not to be nice, so I took it down. Hopefully, I won't need to do that again.


@ June 21, 2014 1:54 PM in sizing indirect for new steam boiler

Consider takng a Find a Contractor ad.

Thanks for your support, Harvey.

@ June 21, 2014 5:45 AM in Brick pathway.

And welcome to the RPA!

What would you like?

@ June 20, 2014 10:12 PM in I finally bought a brick

I'm listening. Thanks.


@ June 20, 2014 1:02 PM in I finally bought a brick

That and a WHOLE lot more, Charlie. The new Wall is going to be amazing. Thanks.

Thanks, guys!

@ June 20, 2014 12:29 PM in I finally bought a brick

Since last February, we've been in the process of having the whole site rebuilt. Four companies are working on it right now and there's still a ways to go, but I think you'll like what we have in store for you.

Your help really helps. Thanks!

Weil-McLain Recalls Ultra Series Boilers Due to Risk of Fire, Explosion

@ June 12, 2014 4:36 PM in Weil-McLain Recalls Ultra Series Boilers Due to Risk of Fire, Explosion


@ May 30, 2014 10:11 AM in Jake Myron's new book

He brings so many nuances to this subject. I was smiling (and remembering) all the way through. What a pleasure it was to spend time with him on a job. I was happy for him when he retired but sorry for myself.

Sunbeam Recalls Holmes Ceramic Heaters Due to Fire Hazard

@ May 29, 2014 2:38 PM in Sunbeam Recalls Holmes Ceramic Heaters Due to Fire Hazard
« 1 2 3 4 5 6 ... 539 »