Boiler Venting

Paul_28

Can a condensing boiler, such as the Weil-McLain Ultra 80, be vented in to a masonary tile lined chimney?

Weezbo

Any thing Can be done once...this is america!

however, lets go with the idea a stainless steel liner ,is going to make the likelihood of collapse of the flue way an aspect of its life that doesnt occur....it is an ideal chase as it were...however...for the record ,i think dumping any heating appliance into a chimney stack designed for a wood fire on a hearth is a very bad idea altogether.

Mark Hunt

Nope


The Ultra and the rest of the condensing boilers must be vented with the approved venting material.

If you try to vent the Ultra into a standard chimney, the chimney will eventually collapse.

Do not attempt it.

Mark H

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Constantin

Curious...

...doesn't this depend? We have yet to meet the chimney expert who'll build a new one for us, but the thought of condensation inside a SS lined/insulated masonary chimney doesn't seem that scary.

For me, the appeal of a SS system is that you'll get exactly the size you need for the flue gases while the insulation ensures that any condensation is held off as long as possible (while also adding zero-clearance per UL 1770 to your list of chimney features).

Retrofitting old chimney's (i.e. 12x12 or so) for modern combustion appliances, now that's another matter... For those with the big bucks, Supaflu, Ahrens, etc. are a very good, if expensive option. We passed, considering that replacing the entire chimney was cheaper than using one of these processes to reline it from the inside. I guess some MBA must have value-priced the procedure for those who do not want to take down any walls inside their home...

Unknown

Think about this

most condensing boilers and furnaces offer some variables on venting. To attempt to go beyond what they have tested and tried is really not a good idea. My experience with condensing gas equipment is this. If you vary from the recommended manufacturers instructions you will pay the price. Been there I did not do it but had to look at the customer and say those dreadful words "call your installer back, this ain't gonna work".

Remember the customers house is not your LAB for testing. I had a job a couple of years back that was installed by the home owner and his buddy, both engineers and there next door neighbour buddy who was a surgeon. It was a nightmare because they decided that they could take all of these liberty's with the installation instructions. The final solution after many nose to nose discussions with these three genuises was do you know anyone who can fix this for us? I reluctantly gave the job to a contractor friend of mine who would probably like to kill me today. It cost them over $10,000 to straighten out the mess they had made.

No I am not bashing engineers or doctors. I am just telling what happened. Keep it simple life is too short.

Mitch_4

Usually...

If you want to use the chimney as a chase to go vertical and out the roof its not usually a problem. But there can be no other appliances sharing it (obviously)

Carl PE

Heh

I talked to a h.o. a couple months ago who had hooked up his new furnace to his 100yo brick chimney. with single-wall, no less.

"Can you look at this puddle in my basement? Where's that coming from?"

"That's coming from your failure to read the installation manual"