BOXT vs Octopus Energy Heat Pump UK 2026: Which Installer?

If you've shortlisted UK heat-pump installers to BOXT and Octopus Energy, you've picked the two largest-volume operators in the country. They've taken different commercial routes to the same outcome - this guide walks through where each pulls ahead.

BOXT's commercial model: standardised packages priced upfront, quote-from-photos (you upload pictures of your existing boiler + property), install booked typically within 4-6 weeks of quote acceptance.

• Pricing transparency: headline price (post-grant) shown before any conversation with sales. Includes equipment + install + commissioning + 7-year warranty.
• Equipment options: primarily Vaillant aroTHERM plus + a small Daikin range. Less choice than survey-based installers.
• Install timeline: 4-6 weeks from acceptance to install for typical properties; faster than the industry average.
• Finance: 0% APR and PCP-style monthly options widely available.
• Customer satisfaction: ~4/5 in this comparison of UK installer feedback - mostly positive, occasional friction reports around the photos-not-survey approach missing edge cases (low-flow water mains, awkward outdoor unit siting).

Octopus's approach is the more traditional engineering route: in-person survey before quote, custom system design based on actual house heat-loss calculations, the proprietary Cosy 6 heat pump (R290 refrigerant, designed in-house specifically for UK conditions).

• Pricing process: survey-based - you get a tailored quote post-survey rather than upfront. Headline prices are competitive once BUS is applied but require the survey investment first.
• Equipment: the Cosy 6 (6 kW R290) is the flagship - low-GWP refrigerant, designed for UK climate. Larger sizing tiers available where survey shows need.
• Install timeline: 8-12 weeks typically (survey + design + install). Slower than BOXT but with more engineering rigour.
• Finance: Octopus offers its own monthly-payment products bundled with the tariff (Cosy Octopus heat-pump tariff at preferential rates for Cosy 6 owners).
• Customer satisfaction: ~4.3/5 - higher average satisfaction in this comparison, particularly for properties where the survey-led approach catches issues BOXT's photo model would miss.

BOXT's commercial model is optimised for the modal UK heat-pump install: a 3-4 bed detached or semi-detached property with conventional wet-radiator heating, replacing a gas combi boiler. For that majority case:

• Faster timeline (4-6 weeks vs 8-12) gets you off gas months sooner - especially relevant if your current boiler is end-of-life.
• Fixed price upfront removes negotiation + back-and-forth. You either accept the package or you don't.
• Predictable equipment (Vaillant aroTHERM plus has a long UK track record + reliable parts supply).
• Lower headline post-grant price than Octopus for equivalent sizing, in most quotes we've seen.

Octopus's survey-led model is the right choice for:

• Unusual properties - period homes, extensions with mixed insulation, properties on private water supplies, areas with low-flow mains. The in-person survey catches issues that photos can't.
• Buyers prioritising low-GWP refrigerant - the Cosy 6 uses R290 (GWP 3) vs the Vaillant aroTHERM plus on R290 too in newer revisions (older versions on R32 with GWP 675). Worth confirming refrigerant on current BOXT spec quotes.
• Cosy Octopus tariff users - the bundled heat-pump tariff has the most attractive run-cost economics in the UK market when paired with the Cosy 6 unit + a smart meter.
• Buyers who want a 10-year warranty - 3 years longer than BOXT's standard 7.

1. What's the SCOP at my likely flow temperature? A heat pump's published SCOP (Seasonal COP) is usually measured at 35°C flow; in a UK home with older radiators you may end up running at 45-55°C, where SCOP drops significantly. Ask for the SCOP at the flow temp the installer is actually designing for.
2. Will my existing radiators need upgrading? Heat pumps work best with larger radiators (lower flow temps). Some installs include radiator upgrades; some don't. Confirm what's in scope.
3. What's the noise rating at the outdoor unit? Look for dB(A) at 1m. Anything above ~55 dB(A) at 1m can be a neighbour issue for close-spaced properties.
4. Who handles MCS certification + warranty registration? The MCS certificate is required for BUS grant eligibility; should be issued automatically by the installer post-commissioning. Get this in writing.
5. What's the post-install service + repair response time? A heat pump should run for 15+ years with good service. Both BOXT + Octopus have UK-wide service networks; confirm response times in your area.

For a standard UK property replacing a gas combi, BOXT is the faster + cheaper route with predictable equipment + the 7-year warranty as the trade-off vs Octopus's 10.

For more complex properties (period homes, extensions, edge cases), Octopus Cosy 6's in-person survey + custom design is worth the longer timeline + slightly higher headline price. The Cosy Octopus tariff bundled with the install also makes the run-cost economics the strongest in the UK market if you stay with Octopus Energy as your supplier.

Both handle the £7,500 BUS grant + finance options + 10+ year warranties on the heat pump itself. The decision is more about the install process you prefer than the end-result.