Why Solar Panels and Heat Pumps Work So Well Together
Solar panels generate free electricity from sunlight. Heat pumps use that electricity to produce heating and hot water. Combine the two and you have a home energy system where the sun heats your home at effectively zero marginal cost. In 2026, with the BUS Grant providing £7,500 towards heat pump installation (subject to eligibility) and the Smart Export Guarantee paying you for surplus electricity, the financial case has never been stronger.
It is a pairing that makes remarkable financial and environmental sense, and with the right system design, a combined solar and heat pump installation can cut your annual energy bills by £900–£1,100 or more (Energy Saving Trust).
Related reading: How much does a heat pump cost in 2026? | BUS Grant 2026: How to get £7,500 for your heat pump
How the Combination Works
Understanding the synergy between solar panels and a heat pump starts with how each technology operates.
A 4 kWp solar panel system in southern England generates around 3,600 kWh of electricity per year. An air source heat pump for a typical three-bedroom home uses around 3,000–4,000 kWh of electricity per year. With smart scheduling, around 50% of that heat pump electricity can come directly from your own solar generation — reducing your heat pump running costs by roughly £430 per year at 2026 grid prices of 24.5p/kWh (Ofgem).
Solar panels (photovoltaic / PV)
Rooftop solar panels convert sunlight into electricity. A typical domestic system in the UK is sized between 3 kWp and 5 kWp and generates between 2,500 and 4,500 kWh of electricity per year, depending on the size, orientation, and location.
The electricity is generated during daylight hours — peaking around midday — and can be used immediately in your home or exported to the grid.
Air source heat pump
An air source heat pump uses electricity to extract heat from the outdoor air and deliver it into your home as space heating and hot water. A typical system consumes around 3,000–4,000 kWh of electricity per year to heat an average UK home.
The synergy
When your solar panels are generating electricity during the day, that electricity can power your heat pump directly — meaning you are heating your home and water using free solar energy rather than paying for grid electricity at 24.5p per kWh (Ofgem, Q2 2026).
With smart controls, you can programme your heat pump to run harder during peak solar generation hours, heating your home and topping up your hot water cylinder while the sun is shining, then coasting through the evening on stored heat.
How Much Can You Save?
A combined solar and heat pump system typically saves homeowners £900–£1,100 per year on energy bills (Energy Saving Trust), depending on system size, consumption patterns, and self-consumption rates. Here is a worked example using 2026 energy prices.
System specification
- Solar panels: 4 kWp system (10 panels), south-facing roof in southern England
- Annual solar generation: 3,600 kWh
- Heat pump: 8 kW air source heat pump
- Annual heat pump electricity consumption: 3,500 kWh
- Self-consumption rate: 50% (with smart scheduling and hot water cylinder acting as thermal store)
Annual energy bill impact
| Without solar | With solar |
|---|---|
| Heat pump electricity: 3,500 kWh x 24.5p = £858 | Solar self-consumed by heat pump: 1,750 kWh x 24.5p = £429 saved |
| Remaining heat pump electricity: 1,750 kWh x 24.5p = £429 | |
| Surplus solar exported: 1,850 kWh x 15p (SEG) = £278 earned | |
| Total annual heat pump cost: £858 | Net annual heat pump cost: £151 |
That is a reduction in heat pump running costs of over £700 per year.
Total household electricity savings
The solar panels do not just power the heat pump. They also offset other household electricity use — lighting, appliances, cooking. A typical household uses around 3,500 kWh of non-heating electricity per year.
Including all electricity use, total annual savings from the solar panels are typically £900–£1,100, depending on consumption patterns and self-consumption rates (Energy Saving Trust).
Energy Independence
Beyond the financial savings, a solar-plus-heat-pump system provides genuine energy security:
- Reduced dependence on the grid — you generate a significant proportion of your own energy
- Protection against price rises — solar electricity costs you nothing once installed
- Lower carbon footprint — you are heating your home with renewable energy from your own roof
- No gas supply needed — you can disconnect entirely, eliminating the gas standing charge of approximately £117 per year (Ofgem, 2026)
Adding a battery storage system (typically £3,000–£5,000 for 5–10 kWh) takes this further by storing surplus solar electricity for use in the evening, pushing self-consumption rates from 50% up to 70–80%.
Related reading: Solar battery storage: is it worth it in 2026?
Sizing Your System
Getting the right combination of solar panel capacity and heat pump size is essential. Here is a guide for different property types:
Small property (2-bed flat or terrace)
- Solar: 2–3 kWp (6–8 panels)
- Heat pump: 5–6 kW
- Annual solar generation: 1,800–2,700 kWh
- Annual heat pump consumption: 2,000–2,500 kWh
Medium property (3-bed semi-detached)
- Solar: 3.5–4.5 kWp (9–12 panels)
- Heat pump: 7–9 kW
- Annual solar generation: 3,100–4,000 kWh
- Annual heat pump consumption: 3,000–3,500 kWh
Large property (4-5 bed detached)
- Solar: 5–6 kWp (13–16 panels)
- Heat pump: 10–14 kW
- Annual solar generation: 4,500–5,400 kWh
- Annual heat pump consumption: 4,000–5,000 kWh
At Electromatic M&E Ltd, we design integrated solar and heat pump systems as a single package, ensuring the two work together optimally. We use detailed energy modelling to calculate the right size for your specific property, roof orientation, and energy use patterns.
Grants and Financial Incentives
Combining both technologies allows you to benefit from multiple financial incentives:
BUS Grant: £7,500
The Boiler Upgrade Scheme provides £7,500 towards your heat pump installation cost, subject to eligibility criteria set by Ofgem. This applies regardless of whether you also install solar panels.
Related reading: BUS Grant 2026: How to get £7,500 for your heat pump
Smart Export Guarantee (SEG)
When your solar panels generate more electricity than you are using, the surplus is exported to the grid. Under the SEG, your energy supplier pays you for this exported electricity. Rates vary by supplier but are typically 12–15p per kWh in 2026.
Over a year, SEG payments typically amount to £200–£350 for a 4 kWp system.
Related reading: Smart Export Guarantee: earn money from solar panels
0% VAT on solar and heat pumps
Both solar panel and heat pump installations are currently zero-rated for VAT in the UK, saving you 20% compared to the standard rate. This applies to both supply and installation.
No capital gains tax impact
Installing solar panels and a heat pump does not trigger any capital gains tax liability — but it does increase your property’s value and improve its EPC rating.
Case Study: A Real Example from Surrey
To show how this works in practice, here is an example based on a typical installation in our service area.
The property: A 1990s-built three-bedroom semi-detached house in Walton-on-Thames, Surrey. Gas combination boiler (15 years old), no hot water cylinder, loft insulation but uninsulated cavity walls.
The solution: - 4 kWp solar PV system (10 panels on south-facing roof) - 9 kW air source heat pump with 210-litre hot water cylinder - Smart controls linking solar generation to heat pump scheduling - Cavity wall insulation (recommended during survey)
The costs: | Item | Cost | |------|------| | Heat pump system (fully installed) | £12,500 | | BUS Grant (subject to eligibility) | -£7,500 | | Solar PV system (fully installed) | £6,500 | | Cavity wall insulation | £1,200 | | Total homeowner cost | £12,700 |
The savings (per year): | Saving | Amount | |--------|--------| | Reduced heating costs (heat pump vs gas) | £173 | | Solar electricity powering heat pump | £430 | | Solar electricity offsetting household use | £320 | | SEG export payments | £265 | | Gas standing charge eliminated | £117 | | Reduced maintenance costs | £100 | | Total annual saving | £1,405 |
Payback period: approximately 9 years — after which the homeowner is saving over £1,400 every year for the remaining 15+ year lifespan of the systems.
Installation: What to Expect
When you choose Electromatic M&E Ltd for a combined solar and heat pump installation, here is what the process looks like:
- Free home survey — We assess your property, measure the roof, calculate heat loss, and discuss your energy needs
- System design — We produce a detailed proposal showing both systems, expected generation and savings, and total cost after grants
- Installation — Solar panels are typically installed in 1–2 days, the heat pump in 2–3 days. We can often schedule both within the same week
- Commissioning — Both systems are tested, commissioned, and registered with MCS
- Handover — We walk you through the controls, set up smart scheduling, and make sure you are comfortable with everything
Planning Permission
In most cases, neither solar panels nor heat pumps require planning permission under permitted development rights. There are some exceptions for listed buildings, conservation areas, and certain property types.
Related reading: Do I need planning permission for a heat pump in the UK?
Is the Combination Right for You?
If you are replacing a gas boiler and have a suitable roof for solar panels, the combined installation is almost always the best value approach. You benefit from:
- The lowest possible running costs
- Two complementary technologies that enhance each other
- Maximum use of available grants and incentives
- Significant increase in property value and EPC rating
- Genuine energy independence
The one scenario where it may not make sense is if your roof is heavily shaded or north-facing, in which case the solar element may not generate enough to justify the cost. This is something we assess during the home survey.
How Electromatic Can Help
Electromatic M&E Ltd offers free home surveys across London and Surrey (TW, KT, SW postcodes). We install both ASHP and solar PV from a single contractor — meaning one survey, one point of contact, and a fully integrated system designed to work together. We handle BUS Grant applications (subject to eligibility), and deliver within 2–4 weeks of survey confirmation. All work is carried out under MCS certification via our accredited umbrella partner.
Call us: 07718 059 284 | Email: admin@electromatic.uk
Frequently Asked Questions
Do solar panels power a heat pump during the day?
Yes. With smart controls and a hot water cylinder acting as a thermal store, your heat pump can be programmed to run during peak solar generation hours. At a self-consumption rate of 50%, a 4 kWp solar system can supply around 1,750 kWh per year directly to the heat pump — saving approximately £430 at 2026 grid prices (Ofgem: 24.5p/kWh).
Can you get the BUS Grant if you already have solar panels?
Yes, subject to eligibility criteria set by Ofgem. Existing solar panels do not affect your eligibility for the Boiler Upgrade Scheme. You may qualify for the £7,500 grant provided your property has a valid EPC, you own the property, and the heat pump is installed by an MCS-certified installer.
How much does a combined solar and heat pump installation cost?
A combined installation — heat pump plus 4 kWp solar PV — typically costs £18,000–£21,000 before grants. After the £7,500 BUS Grant (subject to eligibility) and 0% VAT on both technologies, the net homeowner cost is typically £10,500–£13,500. For details on heat pump costs alone, read our complete guide to heat pump costs in the UK.
What is the payback period on solar panels combined with a heat pump?
Based on typical 2026 figures, the combined payback period is approximately 9–12 years. After the BUS Grant, the net additional investment compared to a gas boiler replacement is typically £7,000–£10,000, against annual savings of £900–£1,400 depending on your system size and energy use.
Is it better to install solar panels and a heat pump at the same time?
Yes, in most cases. Installing both at the same time means a single survey, coordinated installation, and a system designed as an integrated whole rather than two separate retrofits. It also allows the heat pump sizing and solar PV sizing to be optimised together, and you only need to disrupt your home once.
The information in this article is for general guidance only and does not constitute financial, legal, or technical advice. Energy savings estimates are based on typical UK household data from the Energy Saving Trust and Ofgem (April 2026 price cap). Actual savings depend on your property type, insulation levels, energy usage patterns, and electricity tariff. The Boiler Upgrade Scheme (BUS) grant of £7,500 is subject to eligibility criteria set by Ofgem — not all properties qualify. Electromatic M&E Ltd operates under MCS certification via an accredited umbrella partner. All installations comply with Building Regulations Part L and MCS standards. E&OE.
Written by Electromatic M&E Ltd — ASHP & Solar installer, London & Surrey (electromatic.uk)
Last updated: April 2026 | Electromatic M&E Ltd, Company No. 13837345
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