Hello all, I have a Triangle Tube Excellence 110 (model with the integrated DHW) that I am preparing to install. Unfortunately I have come to the conclusion that it probably will not supply enough hot water for my needs. I initially planned to use a Superstor Ultra 45 I have on hand as a storage tank(not as an indirect). However I cannot figure out if this is feasible as it does not have a third port. From the diagrams I've seen of storage tanks they normally have a loop sending hot water from the primary to the dip tube port on the storage tank and then a return line from the drain port of the storage back to the primary. Using the superstor I would have to pipe the return to the boier indirect from the upper outlet port which doesn't seem too efficient. Any thoughts? Anyway possible to just disable the onboard indirect and pipe the superstor as a typical indirect while still keeping my outdoor reset capability on the Excellence?
I'm also considering purchasing a few Myson T6 IVC flat panel radiators and wondered if anyone has any experience with quality and function.
Sure would appreciate any input,
Thanks,
Brian

This is the kind of thing that makes manufacturers drink.

Modifying a UL, AGA, approved product will most certainly void the warranty (usually void if the unit was not installed by a professional anyway) and may prove a hazard to your health and pocketbook.

Sell the Excellence (if you're sure it won't work for you) and buy a boiler sized to the heat load.

Have the indirect-fired water heater sized by a professional.

DIY does not intelligently include design/engineering. This should be left to experienced professionals which, by the way, rarely include online venders of gas-fired equipment.

Just a WAG.

How about piping the DHW outlet from the Excellence in series with the indirect. You'll still be limited by the 3 gpm from the unit, but at least you'll have a little bit of storage.

Singh,
Thank you for your response. What you explained is what I was trying to get across in the previous post. I just don't know the best way to pipe a recirculation loop back to the boiler to keep it hot. I figure that the Superstor is so well insulated that it really won't take much energy to keep it hot. My one or two year plan is to add a small solar system to preheat my DHW and then use the excellence indirect as backup.

Badger,
Thank you as well. I didn't mean to suggest that I wanted to start rewiring the boiler circuit board. I was just hoping that some boiler settings could be changed to easily allow a call for heat from the indirect that would not be limited by the outdoor reset. I admit it was a bit of a longshot. As mentioned above this is all a temporary measure until I get my solar installed.
I realize that DIY boiler installation is not ideal however I am going to have the system checked out by a professional and tuned with a combustion analyzer. Plus it has to be inspected by the county under my building permit. So I think I have the safety issues under control. What I really am concerned about is the future service issues I might run into. My education is in engineering and I just couldn't resist taking on this project myself. However if I knew back a couple years ago how much time I would spend throwing out design after design I just might have paid the extra few thousand. I appreciate your taking the time to respond and your probably tired of my lengthy justifications so I'll shut up now.

No problem,
Your correct in stating an indirect won't have to much losses. Typically 1/4 degree per hour loss. However if you want to install a recirc pump, I would add a tee into the inlet of the Superstor and add the pump there. You would need a check valve between the Excellence,and most recirc pumps have a built in check valve. I would install the aquastat on the indirect an have it control the recirc pump only.
Leave coil for future solar.

Also, I really like the Buderus panel radiators (Dianorm) .

Mr. Singh and others are more patient than I.

My beef is with the on-line characters convincing leyman (licensed engineers excepted) that it is all easy.

If you run recirc. (smallest one available) you will not need a SuperStore or any indirect. A simple storage tank will do (sometimes an electric will cost less).

Many of my heat loads, boiler water/heater specs, radiant design and even radiant Euro-panel systems are done for less than "thousands" but almost always save thousands in the long run.

Myson, DiaNorm, Buderus, Runtal and Thermotech share similar design criteria ISO9002 standards 5 year warranties and Swiss engineering.

Still and all, a little experienced design assistance before-you-start will go a long way.

Mr. Badger missed the part about you using the indirect coil for the future solar.

I'm patient because I do understand this is an public format type site. Q&A available to all, pros and D.I.Y's And if I can contribute I will, if I can't I don't, and if I disagree, I don't type!

As far as assistance goes before you start, I gather that's why you came here before you started taking apart your Excellence boiler. I do agree though with Mr.Badger that it is unfortunate that you have to add an indirect or storage tank after the fact.

If you're doing solar anytime soon the excellence makes a great boost heater since it has 14 gallons of buffer capacity in it.

I would consider solar to the indirect and just let that be preheat for the excellence indirect tank, no recirc involved (you wouldn't want to heat a solar storage tank with fossil fuel). if you don't have any solar you'd still be under on DHW production, but I imagine you should be able to assume any generously sized solar storage would provide enough "warmer than ground water" to allow for higher than 3 GPM through a typical shower load. at lower temperature rises like that, you can sometimes push 5 or 6 GPM through the unit.

it's all about BTUs, really.