Aira vs BOXT (UK 2026): Subscription vs Outright Purchase

Aira and BOXT are the two largest installer-direct heat pump providers in the UK in 2026 - and they offer fundamentally different financing structures. Aira sells the heat pump as a subscription service (Aira owns the hardware, you pay a fixed monthly fee including servicing). BOXT sells the heat pump outright (you own the asset, finance is optional, servicing is separate). The capital-outlay difference is real, the long-term cost difference is real, and the ownership-rights difference matters at the house sale. This comparison covers all three honestly.

The honest comparison requires modelling the full ownership horizon, not just the install cost. For a typical 3-bed UK semi (8kW heat pump, 180L cylinder, basic controls):

Aira subscription: £0 install + £65/month × 12 × 15 years = £11,700 total over 15 years. This includes all servicing, repairs, parts, and end-of-life replacement at year 15. No additional cost for boiler breakdowns, no annual service bill, no out-of-warranty repair shocks.

BOXT outright + finance: £8,500 post-grant install cost (£14,500 install − £7,500 BUS − £1,500 0% finance vs cash discount adjustment) + £200/year annual service × 15 = £11,500 + estimated £1,500 in repair costs over 15 years (~£100/year average) = £13,000 total over 15 years. But you own the asset at year 15 with some residual value (£500-£1,500 in scrap + remaining warranty if any).

The headline numbers come out close - Aira ~£11,700, BOXT ~£13,000 - but the cash-flow profile is very different. Aira is flat at £65/month for 15 years. BOXT is £140-£200/month for years 1-5 (during 0% finance) then drops to ~£20/month equivalent (annual service + repair reserve) for years 6-15. The right pick depends on whether you value cash-flow smoothness or long-term ownership.

Both providers handle the £7,500 Boiler Upgrade Scheme grant but the mechanics differ:

BOXT: the grant appears as a discrete line on your install quote - £14,500 gross cost minus £7,500 BUS = £7,000 net cost (plus VAT relief). BOXT applies the grant on your behalf at the install stage; you see the deduction directly. If you finance the install, the finance amount is the net post-grant figure.

Aira: the BUS grant is baked into the subscription pricing. Aira applies for the grant when they install the heat pump (it stays Aira's asset, so the grant goes to them), and the monthly subscription is set at a level that assumes the grant value. You don't see the grant as a separate line - it's already reflected in the £65/month price.

Both routes use the grant; both pass the value to the customer. The accounting is different but the economics are roughly equivalent in terms of the grant's effect on customer cost.

This is the single most-asked Aira question and the most-overlooked financial implication.

BOXT outright: you own the heat pump. At house sale, it transfers with the house as a fixture. The remaining manufacturer warranty (typically 5-7 years for Vaillant) transfers to the new owner. The heat pump may add £2,000-£5,000 to the home's sale price as a documented MCS-certified efficient heating system.

Aira subscription: you don't own the heat pump - Aira does. At house sale, the subscription must either be transferred to the new owner (Aira's standard process; the buyer takes over the monthly payments) or terminated with an early-exit fee. The early-exit fees are substantial in years 1-5 - typically £3,000-£6,000 depending on remaining term. Buyers can be wary of taking over a 10+ year subscription on a property they may sell again before it expires.

This is why the typical Aira customer profile is "forever home" - the subscription works best when you'll be in the property for the full 15-year term. For households likely to move within 7 years, the BOXT outright route has fewer complications at sale.

Pick Aira if: you don't have £6,000-£10,000 in capital available for the install, you want predictable monthly costs including all servicing and repairs, you're confident you'll be in the property for 10+ years, you value the "no bill shock" servicing model, and you're comfortable with not owning the asset.

Pick BOXT outright if: you have £6,000-£10,000 available (cash, 0% finance, or equity release), you want lower total cost of ownership over 15 years, you want to own the asset for resale value and flexibility, you're confident managing service contracts and out-of-warranty repairs yourself, or you may sell the house within 10 years.

The subscription-vs-outright question is fundamentally about your relationship with capital. Households with capital available almost always come out cheaper with BOXT outright. Households without capital are choosing between Aira and not getting a heat pump at all - and Aira is genuinely the better option in that scenario than continuing with a failing gas boiler.