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601 posts

Ultimate Geek

# 126765 19-Jul-2013 07:08
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As per the title, what is the difference between these two smoke alarms? Which one is better, and why? I plan on getting no smoke alarms for our house.


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Uber Geek

  # 861954 19-Jul-2013 07:44
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"Let’s start with the answer: Within the fire protection and prevention industry, it is recognized that neither sensor type, photoelectric nor ionization, is universally better at detecting all types of fires. Why? Each sensor operates on a different principle and therefore may respond differently to various conditions.Ionization sensors may respond slightly faster to flaming fires, whereas photoelectric sensors may respond slightly faster to smouldering fires.Notwithstanding these differences, to achieve ULC listing, both alarms must be tested to the same standard and meet the same requirements. Since you can’t predict the type of fire that will occur, installing both types of alarms in your home can enhance fire safety.Nuisance alarms in homes from typical cooking activities are affected by the properties of the aerosol produced and its concentration, the location of an alarm relative to the source, and the airflow that transports smoke to an alarm. You need to know that there are a variety of options available.The bottom line: It is not possible to say one sensor type is better that the other for reducing nuisance alarms in kitchen installations. Installing a photoelectric smoke alarm instead of an ionization smoke alarm may be one approach to reducing nuisance alarms. Other approaches might be to relocate the existing alarm a short distance away, replace the unit with a new one, or replace it with a unit that has a hush feature"

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We have ionization ones around the kitchen, and photoelectric elsewhere.  

Always be yourself, unless you can be Batman, then always be the Batman

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Uber Geek


  # 861955 19-Jul-2013 07:45
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You need a mixture of these.
Photoelectric are good for slow burning and as such great for use in or near the kitchen.

ION good for fast burning and reccomended for bedrooms, and mixing up with the photoelectrics in halls, lounges etc.

Edit: conflicts with the above, but thats what I read up off the packet / google.

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