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They look to me to be the exact same product, only mildly different nipples on the valves for the Uponor system. I just can’t pay an additional $200 per manifold. So I will likely get the crimp style and crimp the connections to the manifold.

i am replumbing my entire home, and going with aqua PEX and Uponor fittings. I just priced the 12 port copper manifolds, and WOW! Why would the Uponor outlet manifolds be more than $200 MORE than the crimp style? Everything is the exact same except the Uponor adapter on the valves.

I really appreciate your help!

You have explained that calculation MUCH better than I have been able to find anywhere else! Thank you! We keep our house at about 70 degrees. I actually am about 30 minutes from Lexington. We do get the occasional cold snap like the one 2 weeks ago where we get 4 or 5 degrees below 0. So worst...

Coolcalc is showing 190,000btu for heating?!?! Lol I have all the data and have tried to do the fuel usage calculation, but I don’t have the days that the meter was read, so I can’t be perfectly accurate. I average about 3000 cuft per month in the warmer months, and in the coldest month I used...

I ran the manual J you suggested, a bit confusing, but I did my best, it’s saying my entire house should take 64544 btu’s To heat. That is quite the swing!!! For real world data - I currently have a the smallest wall mounted ventless gas heater (I’m guessing 10,000 Btu) I could find in the...

I appreciate the reply! I used the “slant fin” heat loss calculator app for my iPad to do the calculation. Is that not accurate? It was room by room. It showed my entire home to need about 180k btu. Does that sound crazy? My house in total is about 3400 sqft, without the basement. I also made a...

I have an original 1914 coal fired (converted to gas) boiler that runs my gravity hot water heating via cast iron radiators. I have a pantry, and and a small breakfast room off of the kitchen that are currently unheated by the main boiler. The pantry is roughly 4’x9’, and the breakfast room is...

I have my gas bills for the past 2 years. I’m trying to calculate my actual btu usage. I am being charged by the 100 cubic foot. January of last year I was billed for 303. So that would mean that I used 30,300 cubic feet of natural gas. I have found on the inter webs that there is...

That is with no heat in my pantry, or basement. My attic currently has a stand-alone gas heater, as does my laundry room. But I will have to check my water temp when the boiler kicks on. I have no idea what it is, but I would be surprised if it’s as high as 180. If that was the case the...

I did find charts online for BTU output per hour for cast iron radiators. I measured all of mine, made a fancy spreadsheet to do all the calculation for me. I can change the water temp, it then changes all the BTU calculations for each radiator. So after all the calculations, I have found that...

Right now there is no radiators in my basement. I have a gravity fed system, so the only heat in the basement is what radiates from the wildly inefficient boiler, and mostly uninsulated large black iron pipes associated with the boiler. It actually stays pretty nice down there, but I’m assuming...

I’m working on my zone radiation numbers now. It seems the basement zone is the tough part to get around. Maybe it would be easier to just tie it into my first floor zone, then turn down the flow meter on the manifold?

Loadcalc = 101,377 Total BTU’s heating Slantfin’s tool = 141,574 Total BTU’s heating. I’m waiting to get the quote back from the contractor, but after looking at the house he ballparked it at about 150k. He said he was going to go back and actually do the calculations. He did take lots of...

I did a manual J calculation on coolcalc.com. It says I need 139,934BTU to heat my house. So maybe a 150K BTU boiler isn’t crazytown?

The elevator shaft only goes from the first floor to the second. It doesn’t go to the basement or the attic, so it is captured completely inside of insulated space. The smallest Combi boiler I can find is a 155. If I only need a 100 is that going to be short cycling?

I had a local HVAC company that does boilers come to give me a quote. I told him what I wanted to do, I.e. add radiators to the finished attic, add radiators to the basement, and home run each radiator to manifolds. I have an elevator shaft in the center of my home to be able to easily pull the...

Right now it just stays set on 70. I would like to drop the heat upstairs, and bring the heat up down stairs during the day, and the opposite at night. This is why I want 2 zones. I would like to be able turn off the heat in the finished attic since it is not used often. Not sure if I can do...

Thank you very much! I’m traveling on a business trip right now, but will be home tomorrow. I will get to work on the calculations. I have owned this home for 3 winters now, so I should be able get a good idea from my gas usage. I will post again once I get more information!

I have a 1914 home with the original coal fired boiler that was converted to gas at some point. There are 4 floors in total. Basement, 1st (ground), 2nd, and a finished attic. My current (original) system supplies the 1st and second floor radiators with hot water through a gravity system. I...