I Cann't Vent my boiler. Please help.

Mr. E

Yes I want to know if I can vent outside of my liner and no I'm not replacing the 245,000 or the 40,000 btu aplliance.

Mr. E

venting

I just went to start piping a new 96,000 btu input atmospheric boiler and realised that there was a 6" maybe 7" liner in the existing chimney. the existing steam boiler has an input rating of 245,000 and the hot water heater has a rating of 40,ooo btu. The old chimney seems fairly large and there is sertainly a good draft where I taped in. I want to know if I can still use the chimney it even though there is a liner in there, or if the liner can share the additinal load, and if so what order of btu size has to be first, second, third, for this thing not to spill.

S Ebels

Huh?

You're adding the 96K to the 245 plus the water heater? Or are you saying that the 96 is replacing the 245? What's the concern with the liner? The fact that it's there or that it's the wrong size?

brucewo1b

Steve

I think he wants to vent into the chimney outside the liner that carries 246,000 and 40,000 BTU units in the liner

Timco

What are the input BTU's of all the appliances you plan to hook up, and what is your stack heigth? Start here.

Tim

Mr. E

venting my boiler

The existing and remaining boiler is 245,000 and the remaining hot water heater is 40,000 they are going into the liner. i want to kinow if i can vent outside of the line because the chimney seems big enough and the draft is definatly there.

brucewo1b

Is it big enough for a second liner??

mp1969

Need to Know!

You need to find out why the chimney was lined to begin with.Chimneys prior to the use of high efficiency side vent furnaces were lined almost exclusively due to the way natural gas attacks mortar joints and eventually the integrity of the chimney.

Chimneys after high efficiency units came into to play were lined because they suddenly were oversized and therefore to large to heat up and convect out the fuel byproducts (CO being one of them) We use a seven times rule to determine if there is an oversizing issue.

You need to add up total load and see if this chimney can handle the total BTU's as per applicable sizing charts.
Don't add the second liner if you don't have the proper sized chimney(or liners) to handle the full load!

One option would be a chimney company to reline the entire chimney with materials that can handle the corrosive byproducts of natural gas fired equipment.

On less you want to assume a great deal of liablity here make sure you do it right.There are other options such as customized add on squirrel cage type exhaust boosters (I believe Tjernlund from the Minneapolis area has a vent booster product)

By all means get the inspector's input in order to avoid additional problems!

Mitch_6

Don't sound right

venting into the masonry part of a chimny around a liner.

How is the liner secured at the top they are typically flashed across the opening.

Why is the liner there in the first place.

What state are you in if there is no masonry liner or you are on an exterior wall with the liner in massachusetts and some other paces you must have a metallic liner.

What is the condition of the existing masonry chimny.

Saying the flue "looks" big enough is like saying the boiler "looks" like the right size.

Get a good chimny sweep in to evaluate the flue.

Size and vent the boiler from there you may need to power vent out the side.

Mitch S.

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Steamhead (in transit)

Is the new boiler

steam or hot-water? If the latter, you could easily use an indirect tank with it and dump the gas water heater. If steam, it could still be done but is a bit trickier.

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mp1969

Not What He Said???

I took it as a large chimney with a retrofit liner, put in for some obvious reason. Now he is adding additional BTU's. Probable undersizing problem. Is this not the problem????

MP 1969