greenhomesums
Heat pump calculators and BUS grant checks
Running cost vs gas, 15-year total cost of ownership, Boiler Upgrade Scheme eligibility, and MEES-driven retrofits for landlords.
-
Heat Pump vs Gas Boiler Calculator UK
Compare the running cost, 15-year total cost of ownership, and CO₂ impact of an air-source heat pump versus keeping a gas boiler. Uses the current Ofgem price cap and the UK Boiler Upgrade Scheme grant.
-
Boiler Upgrade Scheme Grant Calculator UK
Check if you qualify for the UK Boiler Upgrade Scheme £7,500 grant for a heat pump — or £5,000 for a biomass boiler — and see your net install cost. Updated for 2026 rules.
-
MEES Landlord Compliance Calculator UK
UK landlords: check whether your rental property meets the Minimum Energy Efficiency Standards (EPC C by 2028 / 2030), see the cheapest measure stack to close the gap, and model grants and penalty exposure.
-
Octopus Agile Savings Calculator UK
Estimate how much you'd save — or lose — switching to Octopus Agile from a flat tariff, by DNO region. Models load shifting, EV charging and heat pump usage against a typical Agile hourly rate curve.
-
EPC Band Upgrade Cost Calculator UK
Homeowner calculator: work out what it would cost to lift your property's EPC from its current band to C, B or A — with the cheapest measure stack, grant offsets, resale-value uplift and green-mortgage savings.