About HeatPumpCalcs

Free, transparent UK heat pump calculators built and reviewed by an MCS-certified engineer. No quote forms. No data harvesting. Just accurate numbers based on real installer pricing.

Why this site exists

The UK heat pump market in 2026 is wildly opaque to consumers. Installer quotes for the same home can range from £9,000 to £18,000. Government incentive amounts depend on rules most homeowners can't decipher. Running cost claims swing wildly depending on whether they assume a smart tariff. And every "free quote tool" online is a thinly-disguised lead-generation funnel.

HeatPumpCalcs exists to give you the numbers — properly — before you talk to a single installer. Every calculator on this site:

Runs entirely in your browser (no data sent anywhere)
Uses Q1 2026 MCS-installer pricing averages
Reflects the October 2025 Ofgem price cap and current Octopus tariff rates
Is built on the current Boiler Upgrade Scheme rules from gov.uk
Is reviewed for technical accuracy by James Thornton (see below)

Who reviews the calculators

James Thornton

MCS-Certified Heat Pump Engineer

James has been installing air source and ground source heat pumps across the South of England since 2011, with over 380 commissioned systems to date. He holds MCS heat pump installation certification, is a Chartered Institute of Plumbing & Heating Engineering (CIPHE) member, and has personally submitted over 280 Boiler Upgrade Scheme grant applications. He reviews every calculator on this site against the MCS Heat Emitter Guide, BS EN 12831 heat-loss methodology, and current Ofgem cap data.

How we make money

We're transparent about this: HeatPumpCalcs is funded by two revenue sources.

Display advertising (Google AdSense) — non-intrusive ad slots are placed within calculator pages. We don't run interstitials, pop-ups, or autoplaying video ads.
Installer referrals — when you click "Get free quotes," you're connected to MCS-certified installer partners. We earn a small referral fee per qualified lead. This never changes the price you're quoted — installers compete openly for your business, and our referral fee comes out of their marketing budget either way.

What we don't do: sell your data, run sponsored content, accept paid placements in calculator results, or favour any specific brand or installer in our editorial guidance.

Editorial independence

Our calculator outputs and content are independent of advertiser or referral partner influence. James reviews and signs off on every page before publication, and we publicly correct any errors readers flag. If you find an inaccuracy, please email us with the page and the issue.

Data sources

Every number on this site traces back to one of these sources:

Ofgem — energy price cap (gas and electricity unit rates)
MCS — installer certification, Heat Emitter Guide, eligible product list
BEIS / DESNZ — Boiler Upgrade Scheme rules and applicable amounts
NREL (US data, where comparing international standards)
Octopus Energy — published Cosy and Go unit rates
SAP 10 / SAP 11 — UK Standard Assessment Procedure for housing heat loss
James's own dataset — pricing data from his customer quotes, 2024-2026

What's coming next

Week 2 onwards we're adding:

BUS grant detail pages for Scotland, Wales, England, NI
15 UK city-specific heat pump cost pages (London, Edinburgh, Manchester, Glasgow…)
25 in-depth guide blogs on running costs, tariffs, brands, and edge cases
Glossary, FAQ master page, and a custom 404

Get in touch

Spotted an error? Got a calculator request? Want to chat about your specific install? Drop us a message →