Boilers-Part 2 – HELP!! I Need a New Boiler! I am so confused about what to buy!


Hi again,
In Part 1, I outlined the different types of boilers available in the marketplace today. To review, there are 3 types.
1. Conventional atmospheric boilers with draft hoods. 60-80% Efficient
2. Power vented boilers 80-85% efficient.
3. Condensing boilers. 90-98% efficient.
Today I want to talk about Conventional atmospheric boilers.
Anyone with a boiler 10 years or older probably has this type of boiler. It looks like the boiler in the picture below.

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This boiler has been the workhorse of the industry for many years. They are reliable, simple and relatively trouble-free. However, there are several problems with this style boiler.
1. They have been found to produce carbon monoxide, the silent killer, when they are not meticulously maintained.
2. For this reason, the TSSA mandated several conditions for the use of any existing boiler.
3. These boilers must be thoroughly tested and checked for CO each heating season. Please see the TSSA advisory below mandating the yearly testing.

In my next blog entry, I will tell you about the dangers of carbon monoxide.

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2 Responses to “Boilers-Part 2 – HELP!! I Need a New Boiler! I am so confused about what to buy!”

  1. Steve Says:

    This is true but only applies to internally stacked chimney liners. If the chimney is on an outside wall then the liner needs to be sized in accordance with the “C” tables in the B.149 Ontario gas code. Please read the TSSA revision carefully. In most cases your liner will need to be sizes properly as most chimneys are not internal flues.

    • JoePremi Says:

      Hi Steve, you are mistaken.
      In the current gas code Annex C.2.2 is the following that explicitly says any lined chimney is considered interior.
      Please see below.

      A Type B vent or a certified
      chimney lining system passing through an unused masonry chimney flue shall not be considered to be
      exposed to the outdoors.

      Please check it out yourself in the current gas code.

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