How we cover UK heat pumps

Every Heat Pump HQ piece draws on five kinds of source material:

• Verified manufacturer specifications. Heating capacity (kW), SCOP (Seasonal Coefficient of Performance) at the relevant climate zone, refrigerant type (R32, R290, R454B etc.), noise (dB at 1m, 3m and 5m), MCS certification status, warranty length. Cited inline with a link to the manufacturer's UK product page (Vaillant, Daikin, Mitsubishi Ecodan, NIBE, Samsung, LG, Bosch, Viessmann, Worcester, Octopus Cosy 6, Aira).
• MCS certification data from MCS Certified — the binding UK reference for whether a heat pump is eligible for the Boiler Upgrade Scheme grant and whether an installer is accredited for grant-eligible installations. We do not recommend a heat pump or installer who is not MCS-certified for grant work.
• Independent technical sources — BSRIA for installer best-practice and field-trial summaries, Energy Saving Trust for impartial running-cost and grant guidance, the Heat Pump Association for industry positions, and DESNZ-commissioned heat-pump field trials when raw data is published. Used for SCOP-in-practice claims (which routinely run below manufacturer-rated SCOP) and for installer-quality benchmarking.
• UK government regulatory and grant source material. The Boiler Upgrade Scheme (BUS) rules and grant amount, the Home Upgrade Grant (HUG), ECO4 eligibility, planning permission and Permitted Development guidance, MCS Installation Standards. Cited inline with a link to the relevant gov.uk page.
• Aggregated customer-review sentiment from public review surfaces (Trustpilot for installers, Which? heat pump reports where publicly available, OFGEM annual customer satisfaction data, the r/HeatPumpUK subreddit, MoneySavingExpert heat pump threads). We summarise patterns, never quote individuals.

UK heat-pump installation is the harder problem than the kit choice. A great heat pump installed badly will underperform; a mid-tier heat pump installed well will hit its rated SCOP. We structure installer reviews around four pillars:

• MCS accreditation — the hard requirement for BUS-grant-eligible installations. We cite the installer's MCS reference number where available and confirm it appears on the MCS certified-installer search at the time of review.
• Survey rigour — whether the installer runs a full heat-loss survey (room-by-room, fabric U-values, EPC-aware) or a back-of-envelope sizing exercise. The first is the MCS Installation Standard requirement; the second is widespread in practice and is the leading cause of oversized systems that short-cycle and underperform.
• Cost and finance transparency — published all-in prices (system + install + commissioning + handover), what is and is not included (radiator upgrades, hot water cylinder, controls), what finance options exist beyond BUS, and what extras typically push the price up.
• Customer outcome evidence — Trustpilot rating volume and recency, any published case studies (with realistic SCOP figures, not just rated SCOP), any published complaints data, and how the installer handles commissioning and aftercare.

Some installers we have written about (Octopus Energy Services, Aira, British Gas) operate at national scale; others are regional MCS-accredited firms. We score each on the same four-pillar framework but accept that a regional firm's Trustpilot volume will be smaller than a national operator's — we look for the share of negative reviews concentrated on aftercare, not the absolute count.

Heat pump product reviews carry an overall score out of 5 and component scores across four pillars:

• Real-world efficiency. SCOP at the UK temperature reference (typically the 35°C-flow figure for underfloor or oversized-rad properties; 45°C or 55°C-flow for retrofit). We weight independent field-trial SCOP heavier than manufacturer-rated SCOP because the latter routinely overstates real-world performance.
• Noise. dB(A) at the relevant distance, with an explicit comparison against the 42 dB Permitted Development limit at the neighbour's property. Many MCS-certified pumps fail Permitted Development noise at typical UK garden distances, requiring full planning consent.
• Refrigerant and futureproofing. Whether the unit uses a high-GWP refrigerant (R410A, R32) or a low-GWP alternative (R290/propane, R454B). UK and EU policy is tightening on high-GWP refrigerants and a pump with a long expected service life on R32 may face refill-cost surprises in the late 2030s.
• Warranty and support. Length of warranty (standard 5-7 years; some manufacturers offer 10+ years on MCS-accredited installs), UK-based support, parts availability lead time on common failure modes (compressor, fan, expansion valve).

An overall score is the weighted geometric mean of the four pillars, weighted to the property type the review is targeting (e.g. a retrofit-property review weights efficiency-at-55°C-flow much more heavily than a new-build review).

A handful of editorial choices we make consistently — and never bend:

• No fabricated personal installation claims. We never write "we installed", "after a winter on our heat pump", "our COP figures", or any phrasing implying first-person installation experience the site has not actually had. The voice is third-person editorial throughout, grounded in independent test data and installer-reported figures.
• No invented customer testimonials. We do not invent reviewer names, satisfaction percentages or social-proof figures. Where we cite installer sentiment, we cite the source surface and date (e.g. "Octopus Energy Services Trustpilot rating 4.7/5 across 2,800+ reviews as of June 2026") rather than fabricating a customer.
• No quotes from real homeowners on forums or social media. Research notes may contain MoneySavingExpert, r/HeatPumpUK or Twitter excerpts as evidence the themes we identified are real, but published pieces use original prose — our editorial observation of patterns, not reportage of individual statements.
• No paraphrased competitor content. Other UK heat-pump editorial sites' specific findings (Which? reports, Energy Saving Trust calculations, BSRIA field-trial numbers) are cited; their prose is not.
• No installer recommendation without MCS verification. Where we name an installer as recommended, we have confirmed their MCS reference at the time of review. We do not recommend non-MCS firms for grant-eligible installations because that would directly cost the reader the £7,500 Boiler Upgrade Scheme grant.
• No silent affiliate placements. Where a review contains an affiliate link to an installer's quote-request flow, it is disclosed. The presence of an affiliate relationship never decides whether an installer is recommended.

The Boiler Upgrade Scheme grant rules change every few years. We treat gov.uk as the binding reference for current eligibility and never paraphrase the rules into our own prose — we link directly to the relevant gov.uk grant application page. We track:

• Current grant amount (£7,500 for air-source heat pumps and £7,500 for ground-source heat pumps as of June 2026; biomass at £7,500 with restrictive conditions; specific shared-loop figures for ground-source in certain configurations).
• Eligibility (England and Wales scheme, MCS-certified installation, replacement of fossil-fuel system, valid EPC).
• Scotland equivalent (Home Energy Scotland grant + interest-free loan, run by Energy Saving Trust on behalf of the Scottish Government).
• HUG and ECO4 overlay rules for low-income households.

We do not estimate grant eligibility for individual properties — that is the installer's job during the MCS survey. We point readers at the official eligibility checker.

Heat-pump content goes stale rapidly because UK policy, grant amounts and manufacturer model years all shift on annual or sub-annual cycles. We aim to:

• Re-check current UK retail pricing on every reviewed heat pump at least every 90 days.
• Refresh installer reviews when MCS accreditation changes, Trustpilot rating shifts by > 0.3 in either direction, or the installer announces a major operational change (new finance partner, geographic expansion, withdrawal from a region).
• Refresh BUS grant guidance within 14 days of any gov.uk policy update (the scheme has shifted incentive levels twice since launch — we treat the current figure as date-stamped, not evergreen).
• Refresh model-year reviews when manufacturers release new generations (Vaillant aroTHERM plus, Mitsubishi Ecodan R290 line, NIBE F2120, Daikin Altherma 3 R refresh cycle).
• Refresh refrigerant-policy commentary when DESNZ or the EU publish phased-down schedules.

Four honest caveats before you act on a Heat Pump HQ piece:

• We are not certified heat-pump installers, MCS surveyors, or chartered engineers. Sizing, refrigerant route planning and electrical commissioning all require certified expertise. Use Heat Pump HQ as a research starting point, not a substitute for a proper MCS-compliant survey by a certified installer.
• Installer reviews are research-based, not personally commissioned. Independent customer-review data + MCS verification + published case-study evidence drive our installer scoring. We do not commission installations to test installers ourselves.
• Running-cost figures are scenario-based, not your-house-specific. Examples assume a standard 4-bedroom UK semi with EPC C, 35°C or 45°C flow, and current Octopus / Cosy Octopus / EDF Heat-Pump tariff pricing. Your house, your tariff, your weather and your domestic-hot-water usage will all change the actual outcome. We try to be explicit about the assumptions in each calculation.
• Affiliate relationships are disclosed inline. Some installer comparison pieces contain affiliate links to installer-quote-request flows. These are disclosed. The presence of an affiliate link never influences whether an installer is recommended or how the comparison is framed.