Lochinvar Noble Combustion Analysis

Le John

How is Efficiency calculated in a combustion analysis? The attached low fire combustion analysis shows the efficiency rating as 99.12. How is this being calculated. 

Big Ed_4

The higher efficiency you will achieve with condensing boilers ,is when running on low temperatures . The efficiency curve will drop on higher temperatures .

EdTheHeaterMan

you need to read this one. https://forum.heatinghelp.com/discussion/195137/why-my-85-efficient-cast-iron-boiler-is-really-only-78-efficient

EdTheHeaterMan

then follow up with this one:
https://tsi.com/getmedia/02417ee5-cccc-4dc7-80bc-f7f10924d20a/CA-basic-2980175?ext=.pdf

Zman

It looks like your boiler is tuned for optimal efficiency. The numbers are perfect!

Combustion efficiency numbers that are calculated, advertised by the boiler manufacture or referred to in the energy code are pure fiction. They make folks feel good but have no basis in math or science.

hot_rod

Must be running that boiler at a low temperature? If 116F is the flue gas temperature.

The key to mod con high efficiency numbers has to do with return temperature.

Even when they start to run out of condensing mode, they are still efficient