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Ventless gas heaters and Manual J
September 27, 2019
10:20 am
Forum Posts: 394
Member Since:
April 6, 2015
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I am guessing you are working under the IRC. See Section G2445 (e.g. 2018 IRC). There are some limitations.  Also, check the manufacturer's instructions to determine if the unit is suitable for continuous use. 

September 27, 2019
12:03 am
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Forum Posts: 1
Member Since:
September 26, 2019
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Question: Can Ventless gas heaters be considered a small portion of the overall heating system when performing a manual J? 


Background: Building official says "no" but code only states that ventless gas heat can not be the sole source. Confused because his interpretation seems to be stretching the code beyond its intent.