Reported reduction in energy use per degree day.
A full year
May 2024 to May 2025, compared with the pre-installation year.
An individual OH4 installation result. This is not a forecast for your building.
A single unit in a wider portfolio
The unit is served by a 30kW combi boiler and heated during office hours. The OH4 system was fitted in May 2024. The published account records an installation of under an hour, with no downtime.
A portfolio decision needs evidence from the actual buildings under consideration. This result does not establish what a larger or more intensively used property would save.
The evidence behind the result
| Source data | The unit’s gas meter. |
|---|---|
| Assessment period | May 2024 to May 2025. |
| Baseline | The pre-installation year. |
| Adjustment stated | Degree days, with published values of 2,200.1 and 2,320.7. |
| Published consumption figures | 10,507 kWh before and 9,322 kWh after. |
| Separately reported adjusted saving | 1,681 kWh over the full year. |
The source describes the saving as degree-day adjusted. The consumption totals and the adjusted saving are different bases; the public summary does not show the full reconciliation. Confirm that calculation before using the kWh saving in a business case.
Read the source
V1 Energy Solutions is a UK-based reseller of the OH4 Energy Saving System, working with clients worldwide. This published case study concerns an OH4 installation. The original report may name OH4 or its installation partner.
The result applies to the monitored unit. Each additional building needs its own suitability check and measurement plan.
Build the portfolio case one site at a time
Choose an appropriate first building, agree the metering boundary and review the pilot result before deciding on a wider rollout.
Review the installation and measurement plan
Related evidence: Devon Chamber of Commerce · All case studies