Aeterno turns energy promisesinto proven outcomes.Home by home, street by street.
HeatAssure™, from Aeterno, is the platform that keeps one governed record of every home you answer for, connected or not, and checks what was delivered against what was promised as evidence arrives.
We build the assurance layer for the energy transition, from Bath, England.
We build everything we run ourselves, for the people who have to stand behind the numbers.
Aeterno is independently owned. No manufacturer holds equity, a board seat, or influence over the method, and that independence is part of what makes the verdicts worth relying on.
Aeterno Ltd is registered in England and Wales, company number 12917530, based in Bath.
Built so you can rely on it, and check that you can.
Documented delivery
Work is scoped in writing before it starts. Acceptance criteria are agreed up front, and the work is judged against them.
Continuity by design
Delivery and operations are documented so that nothing about your deployment depends on any one person. Escalation is named in the contract.
Your tenancy, your boundary
Each customer runs in its own tenancy, with contractual data boundaries.
What you can verify before the first call.
- Manufacturer-agnostic by design: evidence from any maker’s systems, with certified products from 178 manufacturers in the record today.
- Every calculation we stand behind is cross-validated against the government's own reference for its method, from approved SAP software to the official Home Energy Model implementation.
- A live governed platform: every screen resolves against a governed viewpoint, and every claim carries its validation status, including the red ones.
- Three patent families filed.
- The same validated calculations power a reconstruction of UK housing stock covering around 18 million dwellings.
SAP, where it appears above, is the UK's standard method for rating home energy. A governed viewpoint is a checked view of the record, not a copy that can drift. The two scale figures measure different things: 20 million homes is throughput, the scale the Home Energy Model has been run at; 18 million dwellings is coverage, how much of the UK's roughly 30 million homes the stock reconstruction describes.