The iconic Southwest vacuum manufacturer Numatic International, the company behind the Henry Hoover, has installed solar panels at its Somerset factory. The move, as reported by Machinery Market, is part of a broader corporate shift: businesses are treating solar as a core operational investment, not a green badge.
Why business solar matters for your home
When a manufacturer like Numatic, known for its red plastic vacuum cleaners, spends six figures on solar, it is not virtue signalling. It is arithmetic. Ofgem data shows non-domestic electricity prices averaged 21.2p per kWh in 2024, down slightly from 2023 but still double the 2021 level. For a factory running motors, compressors, and assembly lines, every kWh generated on-site cuts a direct cost. The same logic applies to your roof.
What it costs a typical 3-bed semi
A standard 3.5 kWp solar array, roughly 10 panels, costs between £5,000 and £8,000 installed, according to the Energy Saving Trust. On a south-facing roof in Manchester or Bristol, that system generates about 3,000 kWh a year. At the current price cap of £1,738 (April 2025), a household using 2,900 kWh of that generation saves roughly £580 annually on electricity alone. Add the Smart Export Guarantee, paying 15p per kWh for surplus, and payback lands at 8–12 years. The panels last 25–30 years.
The EPC angle you cannot ignore
Homeowners chasing a higher EPC rating before selling or renting should note: solar panels can add up to 10 points to a property’s score, often lifting a D to a C or a C to a B. That matters because from 2028, landlords will need a minimum EPC C for new tenancies. For owner-occupiers, a B or A rating adds an estimated 5–14% to sale value, according to Nationwide data.
The catch: roofs, grants, and timing
But solar is not a universal solution. The system works best on unshaded roofs facing east, south, or west. If your roof is north-facing or heavily shaded by trees, output drops by 30–50%. And the government’s main grant, the Boiler Upgrade Scheme, covers heat pumps, not solar. However, the 0% VAT on solar panels (until 2027) remains, saving a typical household £1,000–£1,600 on installation. Households on standard variable tariffs should act before the April 2026 price cap review, which may lower export rates.
What to do by when
If you are considering solar, get quotes from three MCS-certified installers. Check your roof orientation and shading using the Energy Saving Trust’s solar calculator. Apply for the 0% VAT rate through your installer, it is automatic for systems under 3.5 kWp. And if you are a landlord, factor solar into your EPC upgrade plan before the 2028 deadline. The Henry Hoover company did the sums. So should you.
Frequently Asked Questions
A typical 3.5 kWp system costs between £5,000 and £8,000 installed, with 0% VAT available until 2027. Costs vary by roof type, panel brand, and installer, but prices have fallen by over 80% since 2010.
Yes, solar panels can add up to 10 points to an EPC score, often lifting a property from a D to a C or a C to a B. This can increase sale value by 5–14% and is critical for landlords facing the 2028 minimum C requirement.
