Chimney Inspection Before Installing a New Stove, Insert or Gas Appliance
A chimney that vented one appliance safely may not be right for another. Before you buy a stove, an insert or a gas unit, find out whether the flue is the right size and in good enough shape.
The flue has to match the appliance
Every heating appliance produces a different volume and temperature of exhaust. A flue built for an open fireplace is usually too large for a modern wood stove or a gas appliance, and an oversized flue lets the gases cool too quickly. That causes poor draft, heavy deposits and moisture that attacks the masonry. A chimney that is cracked or lined with damaged tile can be unsafe for any appliance.
Why check before you buy
- The appliance manufacturer sets requirements for the flue, and those decide whether a unit can be connected at all
- A required liner can add a meaningful cost to the project, and it is better to know up front
- A hidden defect in the existing chimney can turn a simple swap into a larger project
- Local codes and the installer you choose may require documentation of the chimney’s condition
What the check covers
We perform a Level 2 inspection, which NFPA 211 applies when the appliance or fuel changes. We examine the flue interior, measure what is there and look for anything that would stop a safe connection.
| Question | Why it matters |
|---|---|
| What is the flue size and shape? | It has to suit the appliance’s outlet and output. |
| Is there a liner, and what condition is it in? | A damaged liner needs repair or replacement first. |
| Is the flue the right height and clearance? | Draft and safety depend on both. |
| Is the masonry sound? | A new appliance puts new stress on an old chimney. |
What we do and do not do
We assess the chimney and, if it needs it, repair it or install a liner. We give you what you need to take to the appliance dealer or installer. Choosing and installing the appliance itself is separate, and we would not recommend one brand or model for you.
Bring the manufacturer’s specification sheet, if you have it. It lets us compare the appliance’s flue requirements with what your chimney has.
What the work involves
How it works
- ShareTell us what appliance you are considering.
- InspectWe examine the flue and chimney for fit and condition.
- ExplainWe tell you what the chimney can and cannot support.
- PlanYou decide whether to repair or reline before you buy.
Questions
Frequently asked questions
Do I need a new liner for a wood stove?
Often, yes. A stove generally needs a flue sized to its outlet, and an open-fireplace flue is usually too large. The manufacturer’s instructions decide.
Can I use my old chimney for a gas appliance?
Sometimes. Gas exhaust is cooler and more moist, so the flue often needs a liner suited to it.
Will you install the stove or insert?
We assess and prepare the chimney. The appliance itself is a separate job.
Should I inspect before or after buying the appliance?
Before. The result can change which appliance makes sense.
Ready to have your chimney looked at?
Call us, or send a scheduling request. We will contact you to confirm a time. Your appointment is not confirmed until we do.