A £7,000 air-source heat pump can cut heating costs by roughly 30% compared to a gas boiler, but the best budget model for your home depends on property size, insulation, and installer access to the £7,500 Boiler Upgrade Scheme grant.
If you are looking to replace your gas boiler with a heat pump without spending a fortune, the key question is whether a budget model under £8,000 can deliver real savings. The short answer is yes: a well-chosen budget air-source heat pump (ASHP) can reduce annual heating bills by roughly 30% compared to a gas boiler, and the £7,500 Boiler Upgrade Scheme grant can bring the effective upfront cost down to as little as £0 to £500 for many homeowners.
What defines a “budget” heat pump in the 2026 UK market
In the 2026 UK market, a budget heat pump typically costs between £6,000 and £8,000 fully installed, before the £7,500 Boiler Upgrade Scheme grant. These are almost always air-source heat pumps (ASHPs), which extract heat from the outside air. Budget models are usually from established brands such as Daikin, Mitsubishi Electric, Vaillant, or Samsung, but they come at lower capacity (5–8 kW) and with fewer smart features than premium models. The grant, available to homeowners in England and Wales, reduces the effective cost to as low as £0 to £500 for many households, making budget heat pumps a very accessible option in 2026 (Energy Saving Trust, 2026; GOV.UK, 2026).
Quick numbers cost, efficiency, and running cost comparison
| Metric | Budget ASHP (5–8 kW) | Gas boiler (24 kW) | Premium ASHP (8–12 kW) |
|---|---|---|---|
| Upfront cost before grant | £6,000–£8,000 | £2,000–£3,500 | £9,000–£14,000 |
| Upfront cost after £7,500 grant | £0–£500 | Not eligible | £1,500–£6,500 |
| Annual running cost (typical 3-bed semi) | £500–£700 | £800–£1,000 | £450–£600 |
| Seasonal Coefficient of Performance (SCOP) | 3.4–4.1 | 0.9 (efficiency not measured same way) | 4.0–4.8 |
| Typical lifespan | 15–20 years | 10–15 years | 15–20 years |
Running costs are based on a typical 3-bed semi-detached home using 12,000 kWh of gas per year or 4,000 kWh of electricity for heating, per Ofgem’s typical domestic consumption values (Ofgem, 2026). The SCOP figures for budget ASHPs come from MCS-certified product data (MCS, 2026).
The best budget heat pump models available in 2026 under £8,000
Four models consistently appear in installer price lists and MCS product directories as strong budget options under £8,000 installed. These are all air-source heat pumps suitable for smaller to medium homes.
- Daikin Altherma 3 R Split (6 kW) – Roughly £6,500–£7,500 installed. SCOP of 3.5–4.0. Known for reliable performance and compact outdoor unit.
- Mitsubishi Electric Ecodan PUZ-WM (5 kW) – Roughly £6,000–£7,000 installed. SCOP of 3.4–3.8. A popular choice for smaller homes with low heat loss.
- Vaillant aroTHERM plus (5 kW) – Roughly £6,500–£7,500 installed. SCOP of 3.6–4.1. Vaillant is a well-known boiler brand, so existing customers may find installation straightforward.
- Samsung Gen 6 R32 Monobloc (8 kW) – Roughly £7,000–£8,000 installed. SCOP of 3.5–3.9. A slightly higher capacity option for homes needing more output.
All figures are based on MCS-certified product data and installer pricing from 2026 (MCS, 2026). Prices include installation by an MCS-certified installer, but exclude any additional radiator or cylinder upgrades.
How the £7,500 Boiler Upgrade Scheme grant makes budget heat pumps cost-effective
The Boiler Upgrade Scheme (BUS) is a government grant that provides £7,500 off the cost of installing an air-source heat pump in England and Wales. It is available to homeowners who replace a fossil-fuel heating system (such as a gas, oil, or LPG boiler) with a heat pump. For a budget heat pump costing £7,000, the grant brings the effective upfront cost to effectively £0, provided the installer fees are covered within that price (GOV.UK, 2026).
Eligibility requires that you own the property, use an MCS-certified installer, and that the property has an Energy Performance Certificate (EPC) with no outstanding recommendations for loft or cavity wall insulation. If your EPC shows these insulation measures as recommended, you must have them installed before applying or the grant may be refused (DESNZ, 2026).
The direct answer which budget heat pump saves the most money in 2026?
Based on current pricing and efficiency data, the Daikin Altherma 3 R Split (6 kW) offers the best balance of low upfront cost (£6,500–£7,500) and high efficiency (SCOP 3.5–4.0). It can save an estimated £300–£400 per year on heating bills compared to a gas boiler in a typical 3-bed semi-detached home. After the £7,500 grant, the effective cost is roughly £0 to £500, giving a payback period of 3–5 years on the remaining outlay (Energy Saving Trust, 2026; Ofgem, 2026).
However, the actual savings depend on your home’s heat loss, your current heating system, and your electricity tariff. If you have a well-insulated home and can switch to a time-of-use electricity tariff, the savings can be higher.
Eligibility and installer verification for budget heat pumps
To qualify for the Boiler Upgrade Scheme grant, your installer must be certified under the Microgeneration Certification Scheme (MCS). You can check the MCS Installer Database at mcscertified.com to find local, certified installers (MCS, 2026). In addition, the installer must be registered with TrustMark, the government-endorsed quality scheme for home improvements (TrustMark, 2026). If you are installing a hybrid system that keeps a gas boiler as backup, the work must also be carried out by a Gas Safe registered engineer (Gas Safe Register, 2026).
What affects the real-world cost of a budget heat pump installation
The headline price of a budget heat pump installation often excludes additional work that may be necessary. Three factors can significantly increase the total cost:
- Property size and heat loss – A larger or poorly insulated home may need a larger (more expensive) heat pump or additional radiator upgrades. Heat loss calculations are required before installation (Energy Saving Trust, 2026).
- Radiator upgrades – Older radiators designed for high-temperature boilers may need to be replaced with larger, lower-temperature ones. This can add £1,000–£2,500 to the total cost.
- Hot water cylinder – If your home has a combi boiler, you will need a hot water cylinder for the heat pump system. Cylinders typically cost £500–£1,500 installed.
These factors mean that even if the heat pump itself costs under £8,000, the total installation bill could reach £9,000–£11,000 before the grant. Always get a full written quote that includes all necessary upgrades (EST, 2026).
How to get a heat pump installation quote
Boiler Upgrade Scheme eligibility checklist
Frequently Asked Questions
The cheapest air-source heat pump models start around £6,000 fully installed before the £7,500 Boiler Upgrade Scheme grant. According to the Energy Saving Trust, budget models from Daikin and Mitsubishi Electric can bring the effective cost to as low as £0–£500 for eligible homeowners.
Yes, a heat pump is typically cheaper to run than a gas boiler. The Energy Saving Trust reports that a budget ASHP can reduce annual heating costs by roughly 30%, from £800–£1,000 for a gas boiler to £500–£700 for a heat pump in a typical 3-bed semi.
Yes, many homeowners can get a heat pump for £0–£500 after the £7,500 Boiler Upgrade Scheme grant. GOV.UK confirms that the grant is available for air-source heat pumps installed by MCS-certified installers in England and Wales.
A 5–8 kW air-source heat pump is usually sufficient for a well-insulated 3-bed semi. The MCS recommends a professional heat loss calculation to confirm the exact size, as insulation and property age affect the requirement.
Yes, budget heat pumps from established brands like Daikin, Mitsubishi Electric, and Vaillant are reliable in UK winters. According to the Energy Saving Trust, modern ASHPs operate efficiently down to -15°C, and the Seasonal Coefficient of Performance (SCOP) of 3.4–4.1 confirms good performance.
