Important Notification

An Energy Performance Certificate (EPC) is a public document related to your address that is used by our simulator to estimate your yearly heating usage and floor area.

Postcode

?
The postcode of the address you wish to simulate. UK residents only.
Postcode not found on postcode API. Postcode may be invalid or not in the UK. Please try a different postcode.
No properties with a domestic EPC were found for this postcode on GOV.UK. Please enter your home's EPC space heating and floor area values manually, or try searching for another property that is similar to yours.
Could not connect to postcode API. Check your internet connection. The API may be down, try again later.
Postcode is valid but could not connect to EPC API. Please enter EPC space heating and floor area parameters manually. These can be found at GOV.UK. Click to dismiss.
For homes located in Scotland, the EPC space heating and floor area parameters cannot be filled out automatically. Please visit the Scottish EPC Register to find out the parameters for your home.
Address needed for your home's EPC. Enter details manually or select a neighbour's address whose home is similar in build and size to yours.
Could not connect to EPC API. Please enter details manually. Click to dismiss.
Connected to EPC API but response invalid. Please enter details manually. Click to dismiss.
Your address was used to fill the space heating estimate and floor area parameters from your home's EPC. You may wish to adjust the parameters manually.
Your home's EPC does not contain a floor area estimate. Enter details
manually
or select a
neighbour's address
whose home is similar in build and size to yours.
Neighbour's Details

Postcode

?
The postcode of the neighbour's address you wish to use to substitute in space heating and floor area estimates for your own home. UK residents only.
Postcode not found on postcode API. Postcode may be invalid or not in the UK. Please try a different postcode.
No properties with a domestic EPC were found for this postcode on GOV.UK. Please enter your home's EPC space heating and floor area values manually or try a neighbour with a different postcode.
Could not connect to postcode API. Check your internet connection. The API may be down, try again later.
Neighbour's postcode is valid but could not connect to EPC API. Please look up your neighbour's EPC manually to find their EPC space heating and floor area parameters. Click to dismiss.
The EPC for homes located in Scotland cannot be collected automatically, and so cannot be used to substitute parameters for your own home. Please select an address located in England, Wales or Northern Ireland.
Could not connect to EPC API. Please look up your neighbour's EPC manually to find their EPC space heating and floor area parameters, or try again later. Click to dismiss.
Connected to EPC API but response invalid. Please look up your neighbour's EPC manually to find their EPC space heating and floor area parameters, select a different neighbour or try again later. Click to dismiss.
Neighbour's EPC does not contain a space heating or floor estimate. Select a different neighbour.

Space Heating (kWh/yr)

Apply

Floor Area (m2)

Apply

EPC Space Heating (kWh/yr)

?
The amount of energy required to heat your home per year. This can be found on your home's EPC. Must be in the range 0-999999 kWh/yr.
Must be in the range 0-999999 kWh/yr.
Your EPC does not contain a space heating estimate. Either enter it manually or select a neighbour's address who does.

Floor Area (m2)

?
Your home's floor area. This can be found on your home's EPC. Must be in the range 25-1500 m2.
Must be in the range 25-1500 m2.
Your EPC does not contain a floor area estimate. Either enter it manually or select a neighbour's address who does.

Thermostat Temperature (°C)

?
The temperature you set your home's heating to. Must be in the range 0.0-35.0°C.
Must be in the range 0.0-35.0°C

Number of Occupants

?
The number of people who live in your home. Must be in the range 1-20 people.
Must be in the range 1-20 people

Max Hot Water Tank Size (m3)

?
The maximum volume of hot water tank you could install. Must be in the range 0.1-3.0 m3. A typical value is 0.5 m3.
Must be in the range 0.1-3.0 m3
Advanced input mode. These features are experimental and may not produce accurate results. Click to dismiss.

Enable Optimisation

+
Cannot submit simulation. Not all input parameters are valid.
Could not connect to Simulator API. Please check your internet connection. Run the simulation client-side under experimental options or try again later. If the problem persists please contact us to report the problem.
Connected to Simulator API but an error occurred. Run the simulation client-side under experimental options or try again later. If the problem persists please contact us to report the problem. Please provide input parameters.
Connected to Simulator API but maximum request time exceeded. The server may be busy. Run the simulation client-side under experimental or try running the simulation later. If the problem persists please contact us to report the problem.
An unexpected error occured running the simulator using client side C++. If the problem persists please contact us to report the problem.
An unexpected error occured running the simulator using client side Rust. If the problem persists please contact us to report the problem.
The simulation exceeded the maximum allotted runtime of 10 minutes. This could be due to device performance and compatitibility, or not using surface optimisation for simulations with a large floor area and maximum water tank volume.
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Simulation complete.
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Once you have run a simulation, you can download your results and reupload them to make use of the result exploration page.
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Copy the input parameters as a link to allow you to load them back up for later.
Results Page Guide

Results Page Guide

The simulator outputs a lot of data which can be overwhelming. To help you visualise the performance of the simulated systems, the results can be explored in either graphical or tabula form. A list of the page's functionality is given below.


  1. Select two metrics to plot, from Upfront/Yearly/Lifetime Cost and Yearly Emissions.
  2. Click on a graph marker to explore a system's details.
  3. Pan and zoom the graph to seperate systems with similar performance.
  4. Menu items with an arrow can be expanded to explore further details.
  5. Toggle the visibility of heating technologies on the graph by clicking the eye icons.
  6. Click on any technology or performance metric from the menu to learn more.

To start exploring your results click the cross at the top of this card to dismiss it. You can return to this guide at anytime by clicking the Results Page Guide button below the submit button.

Table Key

Heat Technologies

Electric Boiler

Air Source Heat Pump

Ground Source Heat Pump

Hydrogen Boiler

Hydrogen Fuel Cell

Solar Ancilleries

Photovolatic Panels

2 m2 of Photovolatic Panels

Evacuated Tube Collectors

Flat Plate Collectors

Photovolatic-Thermal Hybrid