Carbon Bee retrofit devices are arriving in the UK through a new exclusive importer, LH Agro. The technology claims to improve combustion efficiency in existing gas boilers by injecting a fine mist of additives into the burner. For homeowners watching energy bills climb, the price cap rose 5% in January, any device that promises double-digit savings without replacing the boiler deserves a close look.
Hort News reported this week that LH Agro has been named the exclusive UK importer for Carbon Bee retrofit and aftermarket products, as reported by Hort News. The deal covers retrofit kits for domestic heating systems, though LH Agro’s primary background is agricultural and horticultural equipment, a detail that may give some homeowners pause.
Who qualifies, and who doesn’t
Carbon Bee devices are not a boiler replacement. They attach to the gas supply line and inject a proprietary liquid into the combustion chamber. The manufacturer claims the process reduces soot buildup and improves heat transfer, cutting gas use by 15–20%. But UK homeowners should note: the technology is not currently listed under the Boiler Upgrade Scheme or ECO4. Ofgem’s eligibility criteria for heat pump and insulation grants do not cover add-on devices. That means a Carbon Bee retrofit would be an out-of-pocket cost, typically in the range of £300–£600 including installation, far less than a new boiler (£1,500–£3,000) or a heat pump (£7,000–£14,000 after grant).
What it costs a typical 3-bed semi
A household using 12,000 kWh of gas per year at the current price cap (7p/kWh) spends about £840 annually on heating. A 15% saving from Carbon Bee would cut that by £126 a year. At a £500 installed cost, the payback period is roughly four years, better than most fabric-first upgrades, but not as fast as loft insulation (typically under two years). The catch: these figures assume the device performs as advertised in a UK home. The Energy Saving Trust has not published independent test results for Carbon Bee, and the technology’s efficacy can vary with boiler type, age, and maintenance history.
The ‘but’ pivot: what this misses
But the bigger question is whether a bolt-on device can meaningfully improve a home’s EPC rating. The Standard Assessment Procedure (SAP) used for EPCs does not explicitly credit add-on combustion optimisers. Even if the device cuts gas use by 15%, the EPC improvement may be marginal, perhaps 2–3 points on the 100-point scale, enough to nudge a low D to a high D, but unlikely to lift a D to a C. Homeowners aiming for the EPC C minimum required by 2030 for rented properties will still need fabric insulation, efficient heating controls, or low-carbon heating.
What to do and by when
For homeowners considering Carbon Bee, the sensible move is to wait for independent UK trials, ideally from the Energy Saving Trust or a university building research group. LH Agro has not announced a UK launch date for domestic sales. In the meantime, households can check their EPC at gov.uk/find-energy-certificate and prioritise the measures that deliver guaranteed savings: loft insulation (up to £300/year), cavity wall insulation (£400/year), and smart thermostats (£75/year). The Boiler Upgrade Scheme remains open for heat pumps and biomass boilers until 2028, offering £7,500 off installation. Carbon Bee may prove useful for older boilers that cannot be replaced immediately, but it is not a shortcut to the EPC C target.
Frequently Asked Questions
Possibly, but the improvement is likely small, an estimated 2–3 SAP points. The EPC methodology does not explicitly recognise bolt-on combustion optimisers, so the primary benefit is reduced gas consumption rather than a higher rating.
No. It is not listed under the Boiler Upgrade Scheme, ECO4, or the Great British Insulation Scheme. Homeowners would need to pay for the device and installation themselves, typically £300–£600.
