Blog · Voltage optimisation
Voltage optimisation: what it can and can't do
4 August 2026 · 4 min read · 8energy
A lot of UK homes are fed a mains voltage that runs higher than appliances actually need. Voltage optimisation trims it to a steadier, lower level. With VoltSmart, that's built into a smart replacement for your fuse board — so you modernise your electrical protection in the same job.
What it genuinely does
A steadier, lower supply is gentler on motors, compressors and electronics, which can help some appliances last. And because VoltSmart is a modern consumer unit, you get up-to-date protection — RCBOs, surge protection, arc-fault detection — as part of the upgrade.
On savings — read the small print
You'll see voltage optimisation sold hard on bill savings. VoltSmart's own case studies report figures in the range of a couple of hundred pounds a year, but the real number for your home depends entirely on how high your incoming voltage is running and what you run.
So we don't quote you a headline saving. We measure your actual supply first — and if there's little for it to trim, we'll tell you it isn't worth fitting. That's the honest way round.