# 3 reasons our investors keep coming back 🔁 | Airthium (YC S17)

- Canonical URL: https://wefunder.com/feed/350711
- Entity ID: wefunder:feed_item:350711
- Published at: 2026-07-10 16:36:41 UTC
- Updated at: 2026-07-10 16:36:47 UTC

## Author
Franck Lahaye

## Subject
Airthium (YC S17)

## Content
We’re excited to see many of our previous investors doubling down or investing for a third or even fourth time. It’s a strong vote of confidence when our earliest backers decide to increase their position. We’ve come a long way. Here are 3 reasons why investors are coming back: 💰The economics of our solution are compelling. Our engine produces up to 3x more heat than a resistive boiler for the same electricity input. That efficiency ratio makes us cost-competitive with natural gas. In addition, our system connects to a factory's existing gas boiler and switches between electricity and gas depending on the price. Factories always get the lowest-cost option, automatically.🔥Major investors and industrial players are at the table. We've secured more than $9M in funding from Y Combinator, Polytechnique Ventures, the French government and 2500+ Wefunder investors. We have a working prototype, two patents filed, and a paid LOI with a major French chemical plant🏭The market has no good solution yet. There are hundreds of thousands of gas boilers worldwide, each with a 20-year lifespan, all facing rising energy costs and mounting regulatory pressure to reduce emissions. No commercially viable high-temperature electric alternative exists at scale. We're building it.Whether you're already an Airthium investor or you've been following our progress, now is the time to claim your final early bird terms before they sell out. wefunder.com/airthium/invest Here's to the factories of the future running cleaner and cheaper.