“We’re fitting a boiler ?” Mira sneered. “In 2026? Fossil fuels are over, Arthur.”
Three months later, the certification body arrived. A young auditor named Patel walked through the system with a tablet, checking every clause. He tested the interstitial leak detection (Arthur had left a single drop of water in the sump—the alarm shrieked). He measured the flue gas: 0.02% CO, well below the limit. He verified the biofuel delivery manifest—100% waste-derived HVO, no palm oil. bs 5410-3
Clause 1, Scope: This standard covers the safe, efficient, and sustainable use of liquid biofuels in fixed heating appliances. “We’re fitting a boiler
But the hybrid controller watched the sensors. It saw the outdoor temperature plummet. It checked the thermal store (empty). It pinged the biofuel tank level (full of HVO from a local recycler). Then, at 6:15 AM, as Mrs. Hillingdon shuffled downstairs in her slippers, the burner lit. A young auditor named Patel walked through the