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The assurance layer for the energy transition.

Every promise proven,home by home.

HeatAssure™, from Aeterno, is the platform that keeps one governed record per home, connected or not, and checks what was delivered against what was promised.

Your systems stay. You set the policy.

See how it works
Unchecked numbers

Every decision rests on an assumed number.

Britain is electrifying its homes, and most of the numbers behind that work are never checked once the system is switched on.

  • Heat pumps are sold on numbers nobody can stand behind.
  • What was promised at design is never checked in operation.
  • Retrofit budgets are spent on faith.
  • Funding that cannot be evidenced does not stay funding.

Two doors: for heat pump manufacturers · for housing & place.

HeatAssure

Numbers you can stand behind, for every home you answer for.

  • Sell on numbers that survive the install.
  • Check the design promise against the home as it runs.
  • Spend retrofit budgets on evidence, not faith.
  • Keep funding, because you can prove what it paid for.
Illustrative: most tools stop at handover. One record carries the promise across it.

The record that satisfies compliance at design is the same one checked against reality in operation. Most tools live on one side of that line. We keep one record across it.

The certificate says 5.0, meaning 5.0 units of heat out for every unit of electricity in. We modelled the year it never mentions. The gap is decided at design, by flow temperature and emitter choice, rarely by the machine: at 35 °C design flow the same fleet's median beats its certificate.

Exhibit 02The certificate and the year it never mentions
Modelled data — not a test rig
homes, modelled hour by hour
24,931
simulated to build this exhibit
218 million hours
of homes, run at 55 °C flow, below the certificate's 35 °C figure
91%
The yearOne fleet, day by day
What the certificate says. It never changes.Heat out per unit of electricity in, modelled each dayWhat the fleet delivers, day by day (band = the middle half of homes, line = the middle home)
Day of the simulated weather year

11 summer days had no qualifying heating demand — the band breaks there rather than interpolating.

The homesWhere every home lands
Certificate figure — SCOP at 35 °C flow, test rigCertificate figure at 55 °C flow
Modelled seasonal efficiency in the home (SCOP)

One dot per home — all 24,931 homes drawn. Homes beyond the 2.0–6.0 range pile at the edges.

A small tail of homes models above the chart's range, mostly very low demand homes where the ratio runs high; they are drawn folded into the end columns.Modelled: one certified 8.5 kW air source heat pump, installed in 24,931 homes reconstructed from public EPC records, a standard Greater London weather year (CIBSE test reference year), full-year hourly simulation, 55 °C design flow. Certificate values from the public record.Aeterno exhibit series: 01 Technology · 02 Home · 04 Housing & Place · 06 Technology

The claims we make cold, before any NDA.

Proof
  • 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.
  • The same validated calculations power a reconstruction of UK housing stock covering around 18 million dwellings.
  • 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.

SAP, in the claims above, is the UK's standard method for rating home energy.

Your door

Which one are you?

For Heat Pump OEMsKnow what a home needs before you spend.Keep knowing after.For commercial, digital and R&D leads at heat pump manufacturers.How this starts for OEMs For Housing & PlaceDecisions that hold up in front of the board, the funder and the resident.For asset management, sustainability and place planning teams at registered providers (housing associations) and local authorities.How this starts for Housing & Place