Your heating system might be wasting money on something you cannot even see: dissolved gases in the water. We sit down with Stirling inventor Jim Bissett, founder of Biscuit Controls, to explain Hydrogenie, a retrofit device designed to remove dissolved oxygen, capture sludge, and improve how central heating systems behave in the real world. Jim breaks down the core physics in plain language, from vortex flow and negative pressure to why getting air out of the system can reduce corrosion, stabilise circulation, and support better boiler efficiency.

We also dig into the numbers and the practicalities. Jim shares reported results from testing and field installs, including domestic savings claims up to 50% depending on building heat loss, plus commercial examples that show how energy efficiency retrofits can stack. We talk about the broader “Genie” portfolio too: Kerrogenie for heating oil performance, VoltoGenie for voltage optimisation, and CircleGenie for controlling secondary hot water loop pumps that often run 24/7. A standout case study comes from our own hotel setting, where combining voltage optimisation and hot water control helped reduce annual electricity costs from roughly £44,000 to around £30,000 to £32,000.

The conversation goes beyond today’s products into what comes next, including Jim’s early work on capturing dissolved methane from slurry and digestate streams to turn waste gas into usable energy. If you care about reducing energy bills, improving boiler performance, lowering carbon emissions, and finding practical building services solutions that do not require ripping everything out, you will want to hear this one. Subscribe, share it with a facilities manager or property developer, and leave us a review with your biggest question about cutting energy waste.