NTI Trinity Condensing Boiler

Matt Connolly

would want to reduce one half of the boiler's input yet leave the other alone? I understand your concern about longer burn cycles (although in reality it's almost impossible to short cycle any MZ in a detrimental way), however you are missing the practical effect. Other than large one time loads like dhw which are about 10 - 15% of typical fuel usage, the rest of the heating season comes and goes gradually. If you reduce the input on one half, you will simply be ramping up to full fire sooner. It's not like the weather is either 55F or -10F, it's always approaching one or the other. That's why you cut the input in half to give the most even boiler output for the load. If your still concerned about run cycles, make sure you did an accurate heat loss analysis. Why do you need an MZ 40? That's a lot of boiler. Remember, with a condensing boiler there is no need to oversize. If the unit runs full time on the coldest day of the year and your at the desired indoor temperature - congratulations! You optimized your system!

Matt

Uni R

NTI's Trinity Boiler

Looking for any feedback or experience anyone might have with NY Thermal's wall hung condensing modulating gas boiler?

Second question. Are regular gas fired boilers ever reduced in capacity by changing the orifice like oil fired units using a smaller nozzle size? I ask this in regards to the MZ Monitor 40C. It is a two-stage design at 2 x 71,000 BTU input @ 95% AFUE. Could the first stage be significantly reduced (maybe 50%) to allow really long one burner cycles, with the second cycling in occasionally for colder temps or DHW duty?

Doug_5

Matt Connolly will no doubt let you know about the Monitor MZ. He is one of the most knowledgable salespeople you will ever talk to and his products are excellent. As for the NTI Trinity, it's was the right choice for our application and have had it running since last fall with success.

Uni R

MZ 40C

I don't need anything the size of the MZ 40C, but if it were two stage 35MBTU/71MBTU I think that would be even better than modulating because the controls could be far simpler and therefore more reliable/cheaper. The efficiency would be like having multiple boilers. The small one for long runs, and the other for DHW loads or when the temperature really tumbles. I was just wondering if gas boilers had adjustable outputs.

To answer your question, the normal heat load here is far less than half the capacity needed for the design extremes (except for maybe this past winter LOL).

Uni R

Thanks Doug. It's hard finding people who have them. I have contacted them since I was rather surprised it isn't Energy Star rated and appearantly they are in progress to get the certification work done. Makes for a healthier rebate if it is.

I'm still not sure whether I want to get a wall hung or another cast iron boiler to replace my dinosaur, but the Trinity did come recommended by a contractor if I do decide to go wall hung.

tim from Reed Wright

trinity boiler

Just make sure the area you live in does not require an ASME boiler rating. Just pulled one that was not and in Seattle it is required that all "boilers", have a ASME rating.

Matt Connolly

ASME Clarification

> Thanks Doug. It's hard finding people who have

> them. I have contacted them since I was rather

> surprised it isn't Energy Star rated and

> appearantly they are in progress to get the

> certification work done. Makes for a healthier

> rebate if it is.

>

> I'm still not sure whether I

> want to get a wall hung or another cast iron

> boiler to replace my dinosaur, but the Trinity

> did come recommended by a contractor if I do

> decide to go wall hung.

Matt Connolly

ASME Clarification

ASME is only required for commercial applications in some states. It is also needed in larger multi-unit residential dwellings. The number of units varies from state to state. ASME has absolutely NO jurisdiction over ANY single family dwelling. I hope you didn't get stuck by a cast iron brained fool of an inspector! I have the documentation if you need it.
Matt

Matt Connolly

Unirogue...

what is your email address? I emailed you directly and it was returned as undeliverable. I replied straight from the Wall.
Matt

Brian

tim from Reed Wright

asme

Matt, as far as we can tell here in Seattle, all heating boilers are required to be ASME certified to be used in any heating application, be it single family or not. We have a local jurisdiction. This is mandated by the city of seattle boiler code.

Matt Connolly

They may be...

adapting that ASME code as their city code. This is their right, but the national board has no residential jurisdiction. Perhaps they rejected the Trinity because it was so unusual to them and they were just covering themselves. I personally know of many non ASME boilers installed in Seattle that have been inspected and approved.
Matt