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Savings calculator
Enter a postcode or property details below. The calculator sizes heat pumps, solar panels, and batteries for the specific property, then estimates costs, savings, and carbon reduction.
How this works: method, sources and limits.
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Choose the colours and which technologies it covers, then paste one line of code into any page.
More tools
Grant finder
Enter a postcode and answer a few short questions to see which UK grants and funding schemes a household could get.
Boiler escape plan
Helps homeowners plan a boiler replacement before it breaks down, with a personalised readiness plan and calendar reminders. Covers gas, oil and LPG.
Radiator check
Which radiators would need changing for a heat pump, and which are a straight swap – from the radiator type in each room, no measuring.
Installer finder
Postcode search for nearby renewable energy installers, filtered by technology, with contact details and MCS verification links.
Home energy technology visualiser
Preview a life-size heat pump, hot water cylinder, home battery or solar inverter in your own space using augmented reality on a phone or tablet. No app download.
Sound simulator
Play a real heat pump recording and measure the decibel level from anywhere around the home using the phone microphone.
3D house tour
A 3D cutaway of an all-electric home: heat pump, hot water, radiators, solar, a battery, car charging and cooking, with a guided tour of how it fits together.
Watt's House
The same all-electric house, explored with Watt the cat. Send him round the house and whatever he sits beside is explained.