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Thanks Dana. I was checking out the polysio foam and the 1.5" is 10R and the 2" is 13R. Would it be better to attach the polysio foam board to the 1" furring strips or to attach the polysio to the side of 2x4 framing? I might frame the walls with 2x3 since my basement it so small and the...

Thanks Dana. I'll look at getting a HTP UFT-080W or a Lochinvar KHB-055 or -085. I might do that in the spring. If I get the HTP, I could also get one of these https://www.htproducts.com/superstor-contender-waterheater.html. I could then get rid of my hwh.

I measured the square footage of all the radiators and came up with 430. I also used this form to calculate a heat loss. https://hvac-talk.com/vbb/attachment.php?attachmentid=722461&d=1472759155 The btu input needed came out to 34,873. I will keep an eye on the AWT. Thanks for all the help. jb

Thanks Dana for all the info. I'm still reading up on everything you posted. My chimney is on an outside wall and is shared with my semi-detached neighbors house. I'm probably going to keep my boiler since I don't have any problems with it but I will get the Hydrostat 3250-Plus. Will I also need...

Dana, thanks for the links above. I'm learning a ton about boilers. According to this site, https://www.hunker.com/13408622/what-size-boiler-is-needed-per-square-foot-of-a-house they recommend 33.475 BTUs of power output per square foot. That's around 40k btu which is half what my boiler puts...

The vent coming off the boiler is 5". There is about 4 feet of horizontal before it goes int the chimney. The 3" hwh has about 7 feet before it goes into the chimney. The measurement of the terracotta was 7" x 6.5" It looked like each piece of the terracotta was turned 90 degree to the next...

The flue pipe coming off the boiler measures 5 inches. I just read this from the boiler manual. http://mesteksa.com/fileuploads/Literature/RBI%20Water%20Heaters/Spectrum%20IOM%20(SPMIOM-12)_3.pdf "A thorough inspection of the masonry chimney must be performed to ensure that the chimney is...

I have a natural gas RBI spectrum boiler. It is non-condensing. http://www.rbiwaterheaters.com/commercial-boilers/non-condensing/spectrum.html The output says 83,700. I've attached a pic of the model. I have to measure the top of the chimney but it is terra-cotta and it's probably 7 inches...

I have a hot water boiler and the ductwork has rusted where it connect to my chimney on the exterior wall. The chimney was leaking but that has been fixed and now I need to buy what looks like a transition piece made of galvanized steel. Also, I'm not sure what sealant they used when sealing it...