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James61 - look for a copy of your install and use manual here: http://wholehousecombi.com/wp-content/uploads/2013/11/NCB_Installation__Operation_Manual_English_131002.pdf It appears the outdoor re-set temperature sensor is optional. See page 74. Page 64 shows where it would be connected in...

James 61: Low-fire means the lowest the burner can throttle down to. On a Navien NCB-240E, that is 18,000 btuh input, and probably somewhere between 15,000 and 17,000 output (85% efficiency for non condensing mode, up to 95% at peak efficiency in condensing mode - nominal figures pretty...

No expert, but have spent considerable time learning, designing, and installing a CH mod-con system in a totally renovated bungalow in Twin CIties that is working well. Re James 61 system, and maybe pursuant to Cristina Micsa (but lacking info on her heat requirements) : In Mpls/ St. Paul we...

Can you confirm the Navien boiler model number? I think you mean an NCB-240E, which has input of 18,000-120,000 btuh for CH.

We just finished a gut and renovation of our 1915 bungalow in St. Paul. Was a 1.5 story w/ basement and unfinished attic, cast iron radiators, and a 70's vintage Weil McClain Boiler on a gravity fed system. We topped the house and added 2'nd story. It's essentially a new house now. I...

Thanks for your help, Rob. One of the reasons I chose the WBRU was the low loss across the boiler and ability to set it up with a single circ pump. I picked the Alpha to use with homeruns and TRV's at all emitters because it won't deadhead if the emitters all close down. It seemed like a...

I've installed a Westinghouse WBRUNG080 modcon system, using Uponor manifolds and Myson T6 radiators. It is pretty much a home-run system, with each emitter having its own TRV, except for a couple locations where I installed a pair of emitters in series, using a Myson bypass valve at both units...

Stuff - thanks for the reply. This 2nd floor bath is not as critical as the basement and first floor, as I have sheetrock scheduled for next week for lower levels. Inspector suggested I could pressure test as is and if it works, I proceed and deal with any changes to second level plumbing...

HJ- Believe me, I hear you. But I'm still asking for 2 reasons: 1) My inspector is tough, but by the book. He was going to fail a similar wet vented arrangement in another bathroom, but I walked him through it and he agreed it met code and would work. 2) I build science museum exhibits for...

That occurred to me, but isn't the dry vent immediately upstream of the shower trap arm what prevents that from happening? I asked the inspector if installing a dry vent in the shower trap arm that tied vertically into the tub dry vent above the tub rim would cut it, without separating the tub...

I'm trying to get through plumbing rough-ins in a renovation of my old house, and am trying to understand why my inspector won't allow this horizontal wet vented bathroom group. Specifics: Have to follow 2015 MN Plumbing Code (UPC). No 2" trap arm that joins the wet vent portion of the drain...

Thanks for the reply. I can buy complete mini split systems, conventional split systems, and even high velocity AC equipment as a consumer online, but the few truly variable speed condensers for 'conventional' split systems out there look to be through contractors only. Maybe it's because they...

In selecting ac equipment for a total gut and 2nd story addition to a 1915 bungalow, I'm trying to decide between: 1) a multi-zone mini split system with 2 heads/floor (5 heads total - 2 at second level, 2 at first level, 1 at basement (mostly for dehumidification). I like this option for the...

Opinions on whether it's worth it to add insulation to PEX supply and return lines in a hydronic heating seem to be all over the map. I'm running 3/8" OB PEX to 15 panel radiators in my renovation. 1915 bungalow will be a 2-story + finished basement. All 3/8" supply and return lines are...

Perfect, thanks. I ordered up webstone isolation flanges, along with a couple webstone inline flange check valves. Guess it still requires unbolting 1 flange for access, but the valve looks to be bigger and the core is replaceable with a circlip.

OK, another question: are the flat gaskets that Webstone includes with an isolation flange kit fine alone with the Grundfos pumps, or did you double them up with the o-ring gaskets that fit in the pump body grooves?

Mmm - sounds like a good argument for isolation flanges on my 2 circulation pumps. I bought them with iron flanges. Maybe I'll switch that out before I commission the system. I looked online and replacement integral check valves for our Grundfos pumps are ~$25. Ridiculous.

Rob - Thanks for the diagram. That is what I was thinking re DHW recirc pump location. Just means DHW and CH will share a supply port on the boiler. Yes, my DHW and CH recirc pumps both have internal spring check valves. So I guess that solves the concern about convection loops between the...

Maybe this should go in the water heater forum, but I think its pretty 'boiler system' related: I'm finishing my Westinghouse WBRU80 (low/med head firetube boiler) install. This is a direct-pumped system. My Caleffi Aircal separator is just downstream of the boiler CH supply and upstream of...