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Performance data on my Quantum Leap...Boilerpro
And got some very interesting data. The water temps are low, I believe, as the thermometers are on the outside pipe, but under the insulation and well below the boiler thermometer and the aquastat setting. The exhaust temp was taken by suspending the complete thermometer in the exhaust in a vertical section of pipe just outside the exterior wall, so it should be quite accurate.
Boiler supply: 136F
Boiler return: 123F
Boiler and venting system ambient indoor: 48F
The secondary (recuperative)heat exchanger beyond the condensing aluminum block really appears to do the job.... exhaust temps well below return temps. I imagine the low indoor ambient temp is also helping some too.. there's alot of condensate coming back off the vent pipe into the recuperative heat exchanger sump.