Get money off solar panels and heat pumps with Octopus x Santander

Use the links above to get a solar or heat pump quote through Octopus - this is important! If you use a different link, we won't be able to tell you came via Santander.

If you're a Santander mortgage and/or personal current account customer and get your solar panels, battery storage and/or heat pump installed through Octopus, you'll receive a 5% discount off your purchase price.

For heat pumps, your discount will be applied on your final sales agreement provided by the Octopus sales team.

For solar, your discount will be applied on your proposals provided by the sales team.

Offer can be withdrawn at any time.

Your Santander discount won't appear on your initial quote - this is because we'll need to check a few things before we know the final cost of your install.

Don't worry though - as long as you've used the links on this page to get a quote, your heat pump discount will be applied on your final sales agreement provided by the Octopus sales team.

For solar, your discount will be applied on your proposals provided by the sales team.

Average costs

The cost of installation can depend on how many panels you need, whether you choose to have battery storage, and what size of battery you require. The cost of a panel-only installation by Octopus starts from £6,663 (for 2 panels), based on July 2026 prices.

You'll have the option to pay monthly with a fixed-term loan, or pay in full after installation. We'll ask you to pay a non-refundable deposit of £500 when you sign your installation agreement.

According to the Energy Saving Trust, a solar system can pay back its cost in 9–13 years, depending on where you live and how much time you spend at home.

Payback periods are affected by factors such as your household electricity use, your roof size and orientation, and whether your system includes a battery.

After a free consultation, our solar specialists can provide a tailored estimate of your potential savings and payback period based on your home and system design.

What does a standard installation include?

Your quote will be inclusive of your chosen number of solar panels and battery option, microinverters (if necessary) and all other electrical components required to complete the install. Plus labour, delivery costs, scaffolding and our 5-star customer support from start to finish.

Bird proofing will come at an additional cost. We'll provide a final quote once your solar design is complete.

For an Octopus solar installation, you will need to own your home, and you will need a clear space on a pitched roof (aka not flat) that can fit at least 2 solar panels. See our FAQ on how much space you'll need for panel sizes.

Please note that we're not able to install solar for flats or properties with a 3 phase electricity meter just yet.

It's important that this part of your roof sees the sun throughout the day, so a north facing roof will generate less power, and could be unsuitable. We'll also need to be able to install scaffolding below the roof where the panels will be fitted in order to complete the installation.

If Octopus are unable to install solar at your home, we may be able to recommend an Octopus Trusted Trader to complete the job for you, with equivalent care and quality.

Check out the full list of solar installation requirements and considerations.

Following installation, we’ll ask that you install the Fox app, Enphase app, or Tesla app, depending on which brand of inverter you have installed.

With the mobile app, you’ll be able to monitor and manage your usage anytime, anywhere. It’s really simple to use, and simple to control when you need to.

If you have any further questions or concerns, don’t hesitate to get in touch.

Standard installs can be completed within 2 days, and bigger installs can take between 3-4 days. If you need to be elsewhere, no problem - we just ask that you’re in the property whilst we do the wiring, which will take a few hours on one day.

This depends on both how much electricity you generate and when you use it most. For example, if you tend to use a lot of energy in the evening, we’ll probably recommend a battery. This is because you won’t be there to use the energy when the sun is brightest during the day; instead you can store the electricity in the battery for use in the evening. You may also be able to save more with a battery when paired with one of our solar smart tariffs.

Our lives are varied, so there are many more circumstances that might impact this decision - but this is something that our solar advisors will be able to help you with. Find out more about savings here.

If you'd like a battery-only installation and don't need solar panels, check out our blog to find out more.

Our typical heat pump price is £4,459, which is lower than the national average of £5,600.

This is the median post-survey price from all of our heat pump quotes after the £7,500 Boiler Upgrade Scheme has been applied, between the 01/09/2025 - 28/02/2026. National average taken from Boiler Upgrade Scheme statistics: April 2026 - median cost of installation Q4 2025.

Prices vary depending on your home, but we provide a transparent, upfront quote for a standard installation based on your property details.

For the best indication of how much a heat pump will cost for you, get an instant quote.

Heat pumps can work in nearly all homes, but as we scale up, there are a few limitations on homes we’re able to install in right now, such as flats, properties that don't have enough space inside or outside. If we're not able to install a heat pump for you just yet, we'll let you know after you complete the initial form, or after your home survey.

Our dedicated team of scientists and engineers at our Research & Development centre are working hard to find cost-effective heat pump solutions for homes with specialised needs.

Check out this list of installation requirements and considerations.

All of our equipment comes with a manufacturer warranty:

• Solar Panels: 25 years product warranty and 30 years linear power warranty.

• Inverter: Enphase Microinverters come with a product warranty of 25 years, whilst the GivEnergy inverter is covered by a 12 year product warranty.

• Batteries: 12 years for GivEnergy products and 15 years for Enphase products.

• Heat pumps: 8 years for Cosy and 5 years for Daikin.

Our customers are also protected by a 5 year Workmanship Warranty Insurance scheme.

The Boiler Upgrade Scheme is a grant from the Government offering:

• £7,500 off the cost of an air source or ground source heat pump, or

• £9,000 off if you're an off-grid home replacing an old heating oil or LPG system, or

• £5,000 off the cost of a biomass boiler

It aims to encourage homeowners to replace their existing fossil fuel heating system with one that's more efficient and better for the environment.

And unlike other government schemes, there’s no income rules or need to be claiming benefits to be able to apply. As it’s a grant it doesn’t need to be repaid to the government at any point.

So as long as your home is suitable for a heat pump it’s very likely you’ll be able to benefit from the £7,500 grant.

The grant is automatically applied to all our quotes and we take care of all the paperwork for you, plus the cost of a new Energy Performance Certificate (EPC) if you need one.

Check out this blog for further details on the scheme.

A solar system can increase the value of your home

Analysis by the Department of Land Economy at the University of Cambridge suggests a 16% value uplift for new-build homes with enough solar and battery storage to eliminate energy bills. A further study of over five million existing properties indicates a 2-3% value increase for existing homes with solar panels or heat pumps (versus like-for-like gas-heated homes). According to the Sustainable Markets Initiative: Cleantech Homes report, 2024.

Cosy heat pump customers on the Cosy Octopus tariff saved an average of £224 last year compared to using a gas boiler running at 85% efficiency on our standard variable tariff

This figure is based on the actual energy consumption of all Cosy heat pump customers on a Cosy Octopus tariff between 1 July 2025 and 1 July 2026, using tariff rates at the time.

We compared this to the cost of producing the same amount of heat with a gas boiler operating at 85% efficiency, priced using our Flexible Octopus (standard variable) tariff at the same time. 

Savings from gas standing charges were included only for customers who had fully removed their gas supply (less than 3% of customers). Actual savings vary depending on system design, tariff choice, home insulation, and energy use.

Our typical heat pump price is £4,459, which is lower than the national average of £5,600

This is the median post-survey price from all of our heat pump quotes after the £7,500 Boiler Upgrade Scheme has been applied, between 01/09/2025 and 28/02/2026. The national average is taken from the Boiler Upgrade Scheme statistics: April 2026 – median cost of installation Q4 2025.

Cut carbon emissions by 82% with a heat pump

This is the typical reduction in heating carbon emissions using an electric powered heat pump compared to a gas boiler.

The carbon breakdown

• Gas CO2 (tonnes per year) - 2.42

• Electricity CO2 (tonnes per year) - 0.43

• Carbon saving (tonnes per year) - 1.99

Data sources and assumptions

• Gas Energy Usage (kWh) 11500 (Ofgem medium use gas usage (Jun 2026))

• Heat Pump Efficiency 312% (typical seasonal coefficient of performance from a fleet of Octopus high temperature heat pumps)

• Gas Boiler Efficiency 85% (The typical gas boiler efficiency from a BEIS study)

• Gas fuel emissions of (gCO2/kWh) 210 (SAP 10.2)

• Electricity fuel emissions of (gCO2/kWh) 136 (SAP 10.2)

Based on these sources, heat pumps typically produce lower operational emissions when heating the home than gas boilers.

For more information, explore our Octopus Cosy heat pump fleet performance dashboard.

We're the largest heat pump installer on the Boiler Upgrade Scheme

Based on Octopus benchmarking against Ofgem reports from 2024, and we've continued to grow since.

Our customers love their heat pumps! 

- 93% of people say it's the same or more comfortable than their previous boiler

- 87% say it costs the same to run or less

- 83% say it's the same noise or less than the previous boiler

- 90% say it's just as easy or easier to maintain

We survey all our heat pump customers 3 months post-installation to see how they find their heat pump compared to their previous gas boiler. Survey results are taken from a sample of 2,837 customers:

• Comfort: 93% of people say it is the same or more comfortable than their previous boiler.

• Running Costs: 87% say it costs the same to run or less.

• Noise: 83% say it is the same noise or less than the previous boiler.

• Maintenance: 90% say it is just as easy or easier to maintain.

  
  

A heat pump is around 4x more efficient than a gas boiler

Heat pumps don't generate heat by burning fuel. Instead, they transfer existing heat into your home. This means they can deliver multiple units of heat for each unit of electricity used.

Based on performance data from a fleet of installed Octopus Cosy heat pumps, typical real-world seasonal performance (SPF or SCOP) is around 3.6. This means around 3–4 kWh of heat is delivered for every 1 kWh of electricity used (an effective efficiency of 300–400%). By comparison, typical UK domestic gas boilers operate at around 85% efficiency, delivering approximately 0.85 kWh of heat per 1 kWh of gas used. On this basis, a heat pump can be around 4× more efficient than a typical gas boiler.

All our heat pumps are independently tested by the Building Research Establishment (BRE), with SCOP values published on the Microgeneration Certification Scheme (MCS) product database. Actual efficiency will vary depending on the property, system design, and usage. For more information, explore our Octopus Cosy heat pump fleet performance dashboard.

The UK's most awarded energy supplier

We've won more awards for customer service than anyone else.

Heat pumps give reliable, consistent heating and hot water

The heat pump user survey report by Nesta from May 2023 summarises that "users are highly satisfied with their heat pumps". It states: "People living in England, Scotland and Wales who own their home and use a heat pump to heat it are satisfied that heat pumps are safe, reliable, quiet heat sources that are effective for space heating and producing hot water." Find the full report here.

The Cosy heat pump is quiet

Heat pump sound power levels are verified by an independent, third-party laboratory as part of the testing process for inclusion on the MCS product database. The laboratory verifies the sound power on the A-weighted decibel curve, as A-weighting closely aligns to how humans perceive "loudness".

All heat pumps are measured using EN14511 standards to ensure uniformity across manufacturers and models. Our Cosy 6 heat pump has a verified sound power level lower than many other heat pumps of the same capacity.

Heat pump heating makes the air healthier in your home

Homes with a heat pump emit far less harmful nitrous oxide (NOx) emissions than those with gas boilers and cookers, significantly reducing asthma and other respiratory illnesses. According to the Sustainable Markets Initiative Cleantech Homes report.

A heat pump can add thousands to your property value

Analysis by the Department of Land Economy at the University of Cambridge suggests a 16% value uplift for new-build homes with enough solar and battery storage to eliminate energy bills. A further study of over five million existing properties indicates a 2-3% value increase for existing homes with solar panels or heat pumps (versus like-for-like gas-heated homes), according to the Sustainable Markets Initiative: Cleantech Homes report, 2024.

As of April 2025, the average house price in the UK is £265,497 according to the Land Registry. Therefore, a 2-3% value increase for an average house priced at £265,497 would be between £5,310 and £7,965.

Heat pumps typically last longer than gas boilers

The expected lifespan of a typical gas boiler is 10–15 years. A heat pump typically has a lifespan of 15–20 years, with UK government research indicating an average of around 20 years. Manufacturer Daikin reports similar ranges. Actual lifespan depends on factors such as installation quality, maintenance, usage patterns, and operating conditions.

Solar enquiries:

Interested in solar and battery installation?

Call us: 0808 196 6842

Email: solar@octopus.energy

(Our phone lines are open 9am - 5pm Monday to Thursday, and 9am - 4pm Friday.)

Need support after installation?

Call us: 0808 175 1696

Email: solar-aftercare@octopusenergy.services

(Our aftercare phone line is open 8am – 8pm Monday to Saturday, 10am - 6pm Sunday, and we answer emails 7 days a week)

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Have a complaint?**

For the fastest response, fill out this form to raise any issues. Alternatively, you can email us on solar@octopus.energy or call 0808 196 6842.

If you require extra help with setting up your export tariff and supply, please email export@octopus.energy.

Check out our full complaints procedure here.

Please note, if you’re having problems with a solar system that wasn’t installed by us, please seek advice directly from the manufacturer.