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Joined on January 19, 2012

Last Post on August 30, 2014

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@ February 4, 2013 1:11 PM in Understanding Primary/Secondary Piping -ModCon

I think you are getting hung up on this flow rate thing. What it really comes down to is BTU's.
Your 65 feet of baseboards will distribute about 600 btu/foot with 180 water and 150 btu/foot with 110 degree water. That's 39,000 BTU/hour to 9,750 BTU/hour depending on how you set up your heat curves.
Now look at the output ratings on the boilers.The 2 SWEI suggested have minimum outputs of about 8,100 and 9,900. That looks like a pretty good match.
Select a boiler then decide how to pipe it. Gavonni(sp) exchangers like the cadet are finicky about flow rates, they must be piped primary /secondary. Fire tube exchangers like the TT and many of the Lochinvars can often be piped direct.
The bigger question for your design is DHW. You will not be happy with a 40k btu instantaneous. A smaller boiler will require some DHW storage. GPM X 500 X delta T = BTU/Hour.
Hope that helps,

The other end?

@ February 4, 2013 8:25 AM in New Thermostat 3 Wire Hot Water Boiler System

Where do the wires go on the other end? It sounds like you have a 2 stage t-stat but it could be something else.

Pressuretol and Aquastat

@ February 4, 2013 8:22 AM in Hot water off steam boiler controls

It sounds like your steam system is controlled by a pressuretrol as it should be. That system will boil water (212 degrees) until the set steam pressure is reached. The hot water side only needs 180 degree water. When only the hot water side is calling there is no need for steam so the aquastat turns it off at 180.


@ February 3, 2013 4:21 PM in Will an indirect work for me?

An indirect would work great for you. If you have the BTU's to run a tankless you can absolutely do an indirect. The indirect will also work in the future whenever you upgrade your boiler.
If you plan on keeping your existing boiler for a long period of time you can use your existing tankless coil with an electric water heater for storage (no electric hooked up). Icesailor has posted a proven detail for this.


@ February 3, 2013 4:06 PM in Please define short-cycle

The generally excepted number is more than 6 cycles per hour equals short cycling. With modulating boilers I think we should be shooting for longer cycles than that.

My Favorite

@ February 2, 2013 10:24 AM in Triangle tube prestige mod con?

The TT boiler is fantastic. They developed the heat exchanger that is now used by Lochinvar and others (I think the dunkirk is different). They then upgraded it a bit when they switched suppliers.They trimax controllers are very intuitive and the boiler requires little maintenance. I don't think the TT and Buderus are even in the same category. I don't like aluminum exchangers and the GB series have had more than there share of "glitches". Buderus support is still in denial.

Other post

@ January 31, 2013 11:59 AM in Linking Cut Pipe Ends?

Check your other post. I gets confusing when you post in two places.

Double post

@ January 31, 2013 12:27 AM in Better balance, better heat... starting from scratch? (a LONG post.)

I see you have your system posted twice. I think this one gives more details of your system. As Ice and SWEI pointed out you are piped direct return not reverse return. The water is lazy, it just keeps taking shortcuts. With reverse return the water has to travel the same distance to get to every radiator. This naturally balances the system. To convert yours to reverse return, you would run a new supply or return from the boiler to the end that is presently capped. The existing supply or return would be capped at the boiler end. You need to reverse the direction of flow in the main on either the supply or the return.
Pex with o2 barrier would be suitable for the run. I would still use iron or copper near the boiler.
It would be best to pump away from the expansion tank.
With iron radiators and a boiler almost 30 years old I would consider a Mod/Con boiler with outdoor reset. The boiler owes you nothing and those radiators would work great at lower temps. I would expect savings of 30-40%. If you are going to put the work into the repipe why not save some money. I am a huge fan of Triangle Tube boilers. I would recommend any boiler with a fire tube exchanger.
Thank you for the thorough post.  I hope this explanation helps.


@ January 29, 2013 10:59 PM in Ghost flow where we don't want it

What Steve is proposing is parallel loops that all pull through the boiler. Since cast iron boilers don't need very high flows it should work just fine. I would suggest some sort od low temp protection on the radiant slab. Unless the slab is quite small I think it will return cold water which will cause the boiler to condense.

Be careful

@ January 29, 2013 6:08 PM in Ceiling Radiant Heat

I am not a fan of electric radiant in drywall. I remodeled an entire house and switched to hydronic. I really could not believe they got a UL rating.
The system consists of bare electrical conductors imbedded in drywall. The system was energized all the time because the t-stats only switched one leg. There were areas where a slight roof leak had turned the drywall to kitty litter. There was just a bare live wire laying in kitty litter looking for something to arc to.
The panels were clipped together with little plastic connectors which were not accessible.
An electrician could test the amp draw and resistance to get some idea of the health of the panels.
 I personally would not live in a home with electric rad ceilings.

Moving Threads?

@ January 28, 2013 2:02 PM in Moving Threads?

Is it possible for an original poster to move a thread to another category?
It seems many threads start out on "The Wall" or another category and it is soon apparent that it belongs somewhere else. I was wondering how big of a tech headache it would be to make that possible.

Proper installation

@ January 26, 2013 10:34 PM in ModCon Icing on Chimney

I was thinking the purpose of this forum is to insure proper, safe installations. I don't see any on this post. Non meet manufactures specs. as Henry pointed out. I also don't see a whole lot of common sense. Insect screens, proper separation, approved terminations?
What happens when the roof termination ices up? The fan will push the gas somewhere. How about a bird nest or a kids toy (or rocks) in the side wall picture.
Let's all promote proper safe workmanship not "it otta work".


@ January 26, 2013 10:13 PM in Max Heater Delta T - Help me understand.

Does the problem occur when one load is present or only when both call?
It reminded me of this



@ January 26, 2013 3:31 PM in ModCon Icing on Chimney

Do you know the difference between God and a Pilot?

God doesn't think he can fly a plane!

It is condensate and it can plug up the cap. I have seen it and it makes a mess. There is not a manufacture on the planet that would sign off on this detail.
I respectfully disagree

Don't like it...

@ January 26, 2013 10:53 AM in ModCon Icing on Chimney

Why not just drill a hole in the cap, run the pipe through and put a coupler and a screen on top?
I think the condensate could build enough ice to block the termination. What then?Is it worth taking the chance?
Do you really want all that vapor condensing on the cap and dripping down the clay pipe?

Alittle more info

@ January 24, 2013 11:25 PM in Zone short cycles and t stat reads lower than setting

Do you have zone valves or circulators?
Can you post a picture?


@ January 24, 2013 12:01 PM in Diagnostic Challenge: Time for a New Boiler?

Do your underslab loops have isolation valves? If not it may be worth cutting some in.
If you isolate a loop and you stop loosing pressure you have found your leak. If you replace with pex, you could probably run it in 1/2" and cap it with oversized baseboard.Doors are a challenge.

How is it piped?

@ January 24, 2013 11:45 AM in domestic hot water too hot

Do you have the buderus supplied manifold with a separate circulator for the dhw?
A picture would help.


@ January 24, 2013 11:25 AM in domestic hot water too hot

That shouldn't happen. That boiler should be piped for domestic priority.
You should probably repost this in a section other than strictly steam. Pictures of the piping at the boiler would be helpful.


@ January 23, 2013 11:21 PM in Triangle Tube Solo 110 and Smart 80

If you draw out what you have, your problem should be simple to solve.

Trying to figure....

@ January 23, 2013 10:00 PM in Hello, My Name is Mark, & I'm A Wallaholic

I was trying to figure if all your zones should be running at the same temp. You could do a room by room heat loss then try to guess at the output of the different temps. It would be difficult with older rads.
They are all running at the same temp now?
How hard would it be to make new homeruns to each rad?


@ January 23, 2013 8:19 PM in Diagnostic Challenge: Time for a New Boiler?

You don't by chance have access to an IR camera? In some areas you can rent them. If you run the heat on high for a while the leak should look like a blob on the image.
Losing 5 lbs in 6 hours is not a huge leak. You may just have one pinhole. They tend to form where the pipe penetrates the slab if it is corrosion from the outside. If it is due to pipe wear it will usually be after a 90.
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