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Fritz2
Fritz2 Member Posts: 6
The boiler for the heating system (hot water- cast iron rads) in my old three story triplex is probably at least 40 years old. It seems to be running fine but  last year after a minor repair my maintenance guy said in future it would be difficult getting parts.  I am thinking of putting in a high efficiency unit and have got two quotes.



One contractor proposes a boiler he describes as NTI 150



The second contractor proposes a wall mounted Viessman Vitodens 100 model WBIB-35 which includes an "outdoor temperature sensor".



My questions are:



1. Would there be any reason to choose one of these boilers over the other?



2. Is the "outdoor temperature sensor" a good idea?



This is a rental building and is in Ottawa Canada. The second quote is about $800 less than the first.
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