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Is the 5 ” chimney liner sufficient for venting the furnace and the new water heater tank?

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From Moe:

I have in my house a 5 inch chimney liner. A 45000 BTU natural gas furnace is hooked up to it with a 5"  Y collar and 4 ” collar is going to the natural gas hot water tank. The tank is 40 gallons low input type.

I want to replace the tank with a 50 US gallon tank which is 45000 BTU. Is the 5 ” chimney liner sufficient for venting the furnace and the new tank? Please advise me. Thank you.

asked in House Chimney by darekrudy (21,730 points)
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1 Answer

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Hi Moe,

Since there are several variables (more than in your description) that are required to answer your liner diameter question you’d have to use Gama tables. If you scroll down to the next comment from Bill, there’s a link in my answer.

Just follow this link (http://xpedio.carrier.com/idc/groups/public/documents/techlit/58dfa-9si.pdf), go to pages 6&7, pick your type of installation and continue to the correct table. You’ll have to make some measurements to get a correct answer. Let me know if you need any further assistance.
answered by darekrudy (21,730 points)