How to use this tool
- Enter your values in the labelled fields or load the worked example.
- Review the assumptions below, then run the tool.
- Review the result, then copy or download it.
Try this example
{"heatKWh": 12000, "seasonalCOP": 3, "electricityRate": 0.25, "oldEfficiency": 0.9, "fuelRate": 0.09}Accuracy and scope
Uses entered seasonal COP and fuel efficiency; excludes installation, standing charges and maintenance. No building sizing.
Is my data uploaded?
This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.