The problem with a wood stove is not the heat. It is the smoke, a visible plume of inefficiency and pollution. In Centralia, Washington, Noel Putaansuu has spent the last seven years looking at that smoke through the lens of a fire investigator. His company, Smokeless Chimney, makes hardware and sensors to measure the opacity of wood stove exhaust and control the combustion to reduce it [Smokeless Chimney website]. It is a retrofittable climate tech play for a stubbornly analog corner of home heating.
The Wedge of Measurement and Control
The company’s wedge is a 2018 patent application for a system that monitors the opacity of smoke and automatically adjusts the stove’s air intake to optimize combustion [freepatentsonline.com, 2018]. This is about instrumenting the 10 million existing stoves in the U.S. (estimated) with a bolt-on brain [InnovateFPGA, Oct 2021]. The bet is that measurement creates accountability, and automated control creates consistency where human operation fails. Putaansuu, who has investigated nearly 800 fires in his career, frames the problem in terms of ‘dwell time’, the period fuel gases spend in the combustion zone [CleanTech Alliance, Dec 2022]. His hardware aims to manage that variable precisely.
A Solo Founder's Deep Niche
Smokeless Chimney operates as a solo founder’s venture, with Putaansuu as the business owner and primary operator [LinkedIn, retrieved 2025]. His background includes 35 years in fire testing, forensics, and insurance, including a role as a fire investigator at Liberty Mutual [Seattle Angel Conference] [ZoomInfo]. The company’s most recent sign of life is the hiring of a firmware engineering intern in late 2025 [LinkedIn, retrieved 2025].
| Role | Name | Background Note |
|---|---|---|
| Founder & Business Owner | Noel Putaansuu | 35+ years in fire testing & investigation; former Liberty Mutual Fire Investigator [LinkedIn, ZoomInfo]. |
| Firmware Engineering Intern | Rakhshan Sayed | Electrical & Computer Engineering student at Rutgers; intern from Oct 2025 [LinkedIn, retrieved 2025]. |
The Sizing of a Stubborn Market
The market is vast and fragmented. Those 10 million U.S. stoves represent a source of particulate pollution, often in rural and off-grid areas. The customer is an individual homeowner invested in a traditional heating method. The company’s published materials focus on the technology, smoke measurement, combustion control, and power generation from exhaust heat, but are silent on named customers, pilots, or price [Smokeless Chimney website]. Traction is measured in patents and prototypes.
Where the Wheels Could Come Off
Smokeless Chimney faces a steep climb defined by three core challenges:
- The retrofit barrier. Convincing a homeowner to buy and install a sensor and control unit on an existing stove is a high-friction sales motion compared to buying a new, EPA-certified stove.
- The validation gap. The company’s claims of unique market position rest on its own statements. There is no visible third-party validation from environmental agencies, stove manufacturers, or utility incentive programs.
- The scaling engine. As a solo, bootstrapped operation with one recent intern, the company lacks the visible resources for hardware manufacturing, inventory, support, and marketing required to reach a meaningful slice of a geographically dispersed market.
The rebuttal, inherent in the founder’s background, is that trust in this niche is earned through decades of expertise. The bet is that a superior technical solution for a recognized problem will find its audience, one chimney at a time.