Before there was Puroast. Before there was low acid coffee. Before there were hundreds of letters from people whose lives had changed — there was a plant biology professor at UC Davis, a conversation with his son, and one sentence that would eventually reshape the way the world thinks about coffee.
His name was Roy Sachs.
“Plants are the most efficient solar panels on the planet. They are direct stored conversion energy from the sun.”
— Roy Sachs, UC Davis Professor of Plant Biology
Roy Sachs wasn't talking about coffee. He was talking about energy. But the idea he planted in his son Kerry's mind that day would eventually lead to a Venezuelan veranda, a revolutionary furnace, and the founding of a company that would change the history of coffee forever.
Kerry Sachs heard his father's words and something clicked. If plants were already storing and converting solar energy at extraordinary efficiency — if every leaf, every stem, every bean shell was essentially a battery charged directly by the sun — then biomass wasn't waste. It was the most elegant, renewable fuel on earth.
Kerry's perspective on energy shifted completely. He realized something profound: if we could harness biomass into usable energy, we could tap into the most efficient energy source on the planet. Not coal. Not oil. Not even solar panels as we knew them. Plants. Direct stored conversion energy from the sun, waiting to be unlocked.
The question that consumed him: could you build a furnace efficient enough to actually capture that energy at a level that mattered?
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The problem was efficiency. The best biomass converters at the time operated at just 35% furnace efficiency — barely better than a campfire. Two-thirds of the energy locked inside the biomass was being lost. Wasted as heat, smoke, and incomplete combustion.
The scientific consensus was clear. When Kerry brought his ideas to his professors and peers, the response was uniform: improving meaningfully beyond 35% was not realistic. Kerry took that as a challenge.
Kerry Sachs built it anyway. Years of engineering, iteration, and relentless problem-solving later, he had created a biomass furnace operating at above 95% efficiency. Nearly three times more efficient than the state of the art. UC Davis confirmed it independently. The numbers were real.
What followed was extraordinary. A government feasibility study was commissioned to examine what this technology could mean at scale. The results led to serious discussions about something that had never been considered realistic before: the idea of powering entire towns using biomass furnace systems like Kerry's. Clean, renewable, extraordinarily efficient energy from plant matter — the direct stored conversion energy from the sun that Roy Sachs had described in that classroom at UC Davis.
A government feasibility study was done. The idea of powering entire towns with this system was seriously discussed. Kerry Sachs had done the impossible — and no one yet knew that the most important use of his invention hadn't even been discovered yet.
Eventually, Kerry would leave the United States. He traveled to Venezuela, where he found himself among coffee farmers in the Andes who wanted to use a biomass furnace to dry their crops — specifically using their own waste product, the coffee bean shells that piled up after harvest.
Kerry's furnace was exactly what they needed. He went to help them with energy. What he found instead would change his life — and the history of coffee — forever.
But that is the next chapter.
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Shop All Puroast CoffeeRoy Sachs was a plant biology professor at UC Davis and the father of Kerry Sachs, Puroast's founder. His insight that plants are the most efficient solar panels on the planet — direct stored conversion energy from the sun — sparked the chain of ideas that eventually led to the creation of Puroast Coffee.
After Kerry Sachs built a biomass furnace operating above 95% efficiency — confirmed by UC Davis — a government feasibility study was commissioned to explore using this technology at scale. The study raised the possibility of powering entire towns using biomass furnace systems.
The best biomass converters before Kerry's invention operated at just 35% efficiency — barely better than a campfire. Kerry's furnace achieved above 95% efficiency, nearly three times the state of the art, confirmed by UC Davis.
Roy Sachs' insight about biomass energy inspired his son Kerry to build a 95%+ efficient furnace. Kerry took that furnace to Venezuela, discovered traditional Andean coffee roasting, and realized his furnace could replicate that ancient roasting method at commercial scale — creating the world's first genuinely low acid coffee. That is Puroast.
Yes. Puroast holds the USPTO patent on its low acid coffee roasting process — the first ever granted for this technology. No competitor can legally replicate it.
Sources: UC Davis Government Feasibility Study — Biomass Furnace Efficiency. Shibamoto T. et al. (2009). Journal of Agricultural and Food Chemistry. NC A&T University (2024). Low Acid Coffee Study.
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. If you have a medical condition, consult a qualified healthcare professional before making dietary changes.
