Performance Modelling for Mistubishi

Product Modelling for Mitsubishi

Product Modelling is a bespoke service which companies can use to verify a product's performance or use as part of the testing process. This is indispensable when trying to gain consumer confidence and increase commercial reach. 

Elmhurst Energy Consultancy's expert consultants recently worked with Mitsubishi to model the effectiveness of its Ecodan Air Source Heat Pump. Using the government-approved method of assessing and measuring the energy rating of new and existing dwellings (SAP and RdSAP) Elmhurst was able to demonstrate the effectiveness of Ecodan for four typical types of dwellings:

  • Example 1 - 1970s semi-detached dwelling with an LPG boiler
  • Example 2 - 1930s detached dwelling with an oil boiler
  • Example 3 - Pre 1900s mid terrace property with a wood burner and back boiler
  • Example 4 - 1950s top floor flat with electric panel heaters

The calculation itself produces a rating which typically indicates a score from 1 to 100+, with higher scores representing lower energy cost and associated CO2 emissions. This score is determined by many factors including the dwellings thermal elements, heating systems (space and water) and lighting; it also takes into account the positive impact renewable technologies can deliver to a dwelling.


Detailed analysis revealed that installing an air source heat pump such as Mitsubishi's Electric’s Ecodan, helped improve the SAP rating (i.e. how must the dwelling costs to run) across all examples, with the most improvement being made from combining the highly efficient Mitsubishi Electric Ecodan heat pump with the benefits of improved insulation. In one such scenario, the EPC rating improved 210% from G 20 to D 62 (1970s semi-detached property as illustrated in Figure 1). 

emergency efficiency rarting graph

Figure 1- EPC rating for 1970s semi-detached property with and without an Ecodan Air Source Heat Pump

For newly constructed properties the SAP rating improved in the following modelled dwellings:

  • One end terrace, one bedroom, first floor flat
  • One end terrace, two bedroom, house
  • One end terrace, three bedroom, house
  • One detached, three bedroom, house
  • Three detached houses with four bedrooms


The analysis found improvements to the SAP, Environmental Impact and Dwelling Emission Ratings where an air source heat pump was modelled as opposed to a main gas heating system, with the larger detached dwellings seeing the biggest improvements.

What the client said:

“The Elmhurst modelling has helped us and our clients understand the impact that a heat pump has on retrofit applications under the current legislation,” explains Max Halliwell, Communications Manager for Mitsubishi Electric Heating & Ventilation Systems.

“More importantly it has highlighted that the methodology for the EPC calculations for heat pumps requires modification to truly show the energy benefits of this renewable technology.  We look forward to working with Elmhurst on future modelling where we anticipate very significant benefits for our Ecodan range of heat pumps, due to the new grid emission factors.  We know that heat pumps will play a significant role in the UK’s drive to net zero carbon emissions by 2050.”

Product Modelling and compliance

The release of the government’s Future Homes Standard Consultation is expected to significantly increase interest in energy efficiency innovations as housebuilders look to achieve compliance for their building projects. The proposed compliance standards include a reduction of 31% of carbon emissions compared to the current standard for an average home. With 27 million existing houses and the government’s commitment to build 300,000 homes a year by the mid-2020s, while achieving net-zero carbon emissions by 2050, it is clear that the adoption of new technologies could be a viable way to achieve this vision.

To find out more about Elmhurst Energy Consultancy’s Product Modelling Service contact the team. 


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