Guides
Used chimney sweep equipment: working out the cost per year
Compare used and new chimney sweep equipment by cost per year: add refurbishment and downtime to the asking price, then divide each option by its service life.
What to take away
- A used unit wins only when its cost per year, with refurbishment and downtime added, is lower than the new unit's.
- Divide each option's total cost by its own expected service life in years, then compare the two results.
- Sweeps routinely forget the downtime term, and a short fall season makes it large.
- Visible failures (rods, whips, brushes, hand tools) are easy to price; invisible ones (filtration, calibration, electronics) are guesses.
- Confirm what your provincial regulator, your WETT certification body and your insurer require of a tool before you buy it used.
Why the asking price misleads
The asking price is only one term in what a used unit costs. Refurbishment, filters, calibration and lost working days all land on you after the purchase, and any one of them can outweigh the discount that made the used unit look attractive.
Treat the comparison as a cost per year. The new unit has one number to know, its price. The used unit has three more to estimate, and honest estimates need your own season, your own revenue per working day and your own view of how long the unit will last.
These are purchasing considerations only. Diagnosing or repairing chimney, flue or venting defects, firebox cracks or creosote ignition risk belongs to a WETT-certified technician, NFPA 211 and your local fire authority.
The cost-per-year formula in five steps
Work in variables rather than guessing at prices. Every step uses a number you can look up or estimate from your own books, and none of them needs a quoted market price from anyone else.
- Write down
N, the price of the new unit, andU, the asking price of the used one. - Add
R, the refurbishment the used unit needsparts, labor, filters and calibration. - Estimate
D, the revenue lost per day the unit is down during your season, andd, the expected downtime days in the first year. - Estimate
L, the expected service life in years, separately for the new unit and the used one. - Compare
N / Lfor the new unit against(U + R + D x d) / Lfor the used one. The used unit wins only when the right side is lower.
Sweeps routinely forget the D x d term, and in a short fall season one week of downtime can erase the entire saving. Your day rate comes from your break-even numbers, so work it out before you shop rather than after.
A worked comparison with a HEPA vacuum
Take N from a real quote. New HEPA units in the class sweeps buy, such as the Nilfisk GD930 HEPA, the Festool CT 26 and the Makita 447L, typically list from about $700 to $1,800. Round numbers then show the effect on the total.
A new HEPA unit at $900 over seven years works out to $129 a year. A used one at $350, plus $250 in filters and service, plus five downtime days at $600 a day, is $3,600 over five years, or $720 a year.
| Term | New unit | Used unit |
|---|---|---|
| Price | $900 | $350 |
| Filters and service | None in this example | $250 |
| Downtime | None in this example | 5 days at $600 |
| Total cost | $900 | $3,600 |
| Service life | 7 years | 5 years |
| Cost per year | $129 | $720 |
Those are illustrative inputs, not quoted prices. Downtime is the largest term in the used column. That is why a used vacuum with a failing motor costs more than a new one by the second season, and why the sticker price tells you so little.
Where each purchase lands in the formula
Buy used where the failure is visible and the fix is cheap, because R and d are then easy to estimate. Buy new where the failure is invisible. Filtration, calibration and electronics fail quietly, and the customer finds out before you do.
| Item | What drives R and d | Check before paying |
|---|---|---|
| Rotary rods and whips | A bent rod whips the flue wall instead of the creosote | Thread wear, straightness and whip condition |
| Poly brushes | A wrong diameter does nothing for the flue | Diameters match the homes you serve |
| HEPA vacuum | Filter seal and motor, both out of sight | Price it new |
| Inspection camera | Parts and service for the model | Both still available |
| Combustion analyzer | Calibration every year or two | Typically $100 to $300 plus sensors; a Testo 310 lists near $500 new |
A used 6-inch brush does nothing for an 8-inch liner, so a used set only helps if the diameters match your route.
Reel systems such as the Ridgid SeeSnake microReel and the Wohler VIS 250 typically run $1,000 to $3,500 new, so a camera is where a wrong guess about R costs most. A discontinued camera with a cracked screen is a paperweight with a reel attached.
Checks before the money moves
Requirements vary by province and municipality, so confirm with your provincial regulator and your WETT certification body before assuming a used tool satisfies them. Your insurance cover may also set conditions on equipment used during insured work. Ask both, in writing, before you pay.
- Thread wear, straightness and whip condition checked on the rods
- Brush diameters match the flues on your route
- Parts and service confirmed for the camera model
- Refurbishment cost (
R) written down before you agree a price - Regulator, WETT body and insurer have confirmed the tool is acceptable
In the United States, the credential to look for is CSIA certification. NFPA 211 is the venting standard that inspection work is measured against, and neither replaces your local fire authority's rules.
The EPA's chimney sweep resources cover public education material you can hand to customers. For the tools you buy, OSHA's recommended practices take a proactive approach to managing workplace safety and health. Your provincial OHS authority sets the rules that apply to you.
Building the kit in the right order
Buy the items that touch the customer's air first, because a filtration failure is a callback and a callback is unbilled time. Buy the items that touch the flue second, because those are visible and repairable. Buy the vehicle and storage last, once the route is stable.
A practical sequence for a new owner:
- New HEPA vacuum from Nilfisk, Festool or Makita, sized to the work you actually book.
- New poly brushes from Rutland or Gardus in the two or three flue sizes your area runs.
- Used rotary rods, inspected for thread wear and straightness.
- Used hand tools, drop cloths and ladders.
- Camera system, new or used, only with confirmed parts and service.
Put the resulting cost per year into your business plan rather than the asking prices. The equipment checklist for new owners lists what each tier of the kit is for.
Common questions
Why divide by service life instead of comparing prices?
A cheaper unit that lasts fewer years can cost more per year. Divide each option's total cost by its own expected years, then compare the two results.
How do I find my downtime cost?
Use your own revenue per working day in the season when the unit would sit idle. Take it from your invoices, because a short fall season makes every lost day count for more.
Does the formula say to buy everything new?
No. Rods, whips, brushes and hand tools are the visible-failure items: you can see a bent rod, and a replacement whip costs little. The formula favors new only where the failure is invisible.
Is a used camera ever worth buying?
Only when parts and service remain available for that model. Without them, the saving on the price disappears into downtime the first time the screen or reel fails.
