diameter of replacement chimney

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Old 08-01-14, 04:11 PM
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diameter of replacement chimney

I got an estimate for replacing my chimney with a triple wall steel thru roof chimney. I need advice on diameter. 100,000 btu boiler and 50 gal. Hot water heater. This is to replace a deficient brick chimney with a 9"x9" opening
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Old 08-01-14, 04:20 PM
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What diameter did the guys who gave you the estimate advise?

All gas appliances?

You're talking STAINLESS steel, right?

Why don't you have a liner installed in the existing? I bet they could get two liners in that existing flue, one for the water heater (4" probably) and one for the boiler.
 
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Old 08-01-14, 04:50 PM
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Take a look-see here... roam around the website, lots to absorb and learn from.

I've got no interest in this company other than as a satisfied customer.

Chimney Liner Depot - Buy Flue Liner, DIY Chimney Repair

Their tech support is good.

Unless your chimney is literally falling apart I would strongly urge a LINER instead of a new hole in the roof.
 
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Old 08-01-14, 04:52 PM
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triple wall stainless. Chimney is a complete loss, has to go. too short no crown no liner needs repointing and is in the bottom of a valley no way to catch the water that crashes into it. oh and the flue is crumbling.
 
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Old 08-01-14, 04:55 PM
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nothing short of taking it down and moving it three feet and rebuilding it will ever make it w
 
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Old 08-01-14, 05:03 PM
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Oh yea all gas. Is there a formula for btus/inchs
 
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Old 08-01-14, 05:20 PM
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There may be a formula, but sorry that I don't know it.

I think that in general, the size of the chimney is dictated by the size of the appliance flue. If the boiler has a 6" outlet, you need a 6" liner.

Your issue is more complicated because you'll be venting both into one chimney which may require larger flue.

What do your local building codes say? SURELY for this job the contractor will be pulling permits and there will be an inspection, right?

What diameter did the guys who gave you the estimate advise?
 
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Old 08-01-14, 05:32 PM
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6" I was told no permit required by the contractor. I have not had time to check with town yet. The flu on the boiler is 6" and I think the hot water.heater is 3 or 4"
 
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Old 08-01-14, 05:52 PM
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I was told no permit required by the contractor.
Yeah... you better check that with the town. I find it VERY unlikely that no permit is required for a chimney installation.

One should never play with fire... but I think you know that.

Also, I know you know this too, but you need to get several bids on that job.
 
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Old 08-01-14, 06:33 PM
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I am suspicious about the permit .this guy was very well rated on a couple of different websites and came up clean with the BBB. His price seemed fair I just was unsure about the diameter seemed small to me
 
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