Home Heat Pump Guide

Heat Pump Finance and Payment Plans UK

Even with the BUS grant reducing costs by £7,500, a heat pump installation might still require £2,000-£8,000 out of pocket. Not everyone has that kind of money readily available, and that is perfectly normal. The good news is that there are several ways to finance a heat pump installation, including 0% interest options, green loans, and installer payment plans.

This guide covers every realistic financing option available to UK homeowners in 2026, with the costs, terms, and things to watch out for.

Step One: Reduce the Amount You Need to Finance

Before exploring finance, make sure you are minimising the amount you need to borrow:

The BUS Grant

The Boiler Upgrade Scheme provides £7,500 towards the cost of a heat pump. This is not a loan — it is a grant that does not need to be repaid. Your MCS-certified installer applies on your behalf, and the money is paid directly to them, reducing your bill. There is no income test or means assessment.

For a £10,000 installation, the grant reduces your cost to £2,500. For a £12,000 installation, you pay £4,500. This is the most important step in making a heat pump affordable.

Other Grants and Schemes

  • ECO4 (Energy Company Obligation): Available to low-income households, those on benefits, or those living in fuel poverty. Can cover the full cost of a heat pump in some cases. Check eligibility through your energy supplier or local authority.
  • Home Energy Scotland: Grants and interest-free loans for Scottish homeowners. Up to £7,500-£9,000 in grants, plus up to £7,500 in interest-free loans.
  • Nest (Wales): Free home energy efficiency improvements including heat pumps for eligible Welsh households.
  • Local authority schemes: Some councils offer additional grants or top-up funding. Check with your local authority's energy efficiency team.

Finance Option 1: Installer Finance (0% Interest Deals)

Many heat pump installers now offer finance packages, often including 0% interest deals for the first 12-24 months. These are typically provided through a third-party finance company that the installer partners with.

How It Works

  • The installer provides a quote for the installation
  • The BUS grant is applied, reducing the total
  • The remaining balance is financed through fixed monthly payments
  • You complete a credit application (credit check required)
  • If approved, the finance company pays the installer and you repay in monthly instalments

Typical Terms

  • 0% interest period: 12-24 months (some offers up to 36 months)
  • Extended terms (with interest): 3-10 years at 5-9% APR
  • Minimum finance amount: typically £1,000-£2,000
  • Maximum finance amount: typically £15,000-£25,000
  • Early repayment: usually no penalties

Example: £4,500 After Grant

  • 0% over 24 months: £187.50 per month, total cost £4,500
  • 5 years at 6.9% APR: £89 per month, total cost £5,340 (£840 interest)
  • 10 years at 7.9% APR: £55 per month, total cost £6,600 (£2,100 interest)

Pros and Cons

  • Pro: Convenient — arranged through the installer as part of the quote
  • Pro: 0% deals genuinely cost you nothing extra if paid within the promotional period
  • Con: Interest rates after the 0% period can be higher than alternatives
  • Con: Ties you to one installer (you cannot easily compare if finance is pre-arranged)
  • Con: Credit check required

Finance Option 2: Green Personal Loans

Several UK banks and building societies offer dedicated "green" personal loans with preferential rates for energy efficiency improvements including heat pumps.

Providers and Typical Rates (as of early 2026)

  • Nationwide: Green additional borrowing on mortgage at mortgage rate (often 4-5%)
  • Co-operative Bank: Green personal loan from 5.9% APR
  • Ecology Building Society: Green renovation mortgage from 4.5%
  • Triodos Bank: Green personal loan from 5.5% APR
  • High street banks: Standard personal loans at 5-8% APR (not specifically green, but usable)

Green loans often offer lower rates than standard personal loans because the lender recognises that the improvement reduces the property's energy costs and increases its value, making it a lower-risk investment.

Example: £4,500 Green Personal Loan

  • 3 years at 5.5% APR: £136 per month, total cost £4,896 (£396 interest)
  • 5 years at 5.9% APR: £87 per month, total cost £5,220 (£720 interest)
  • 7 years at 6.5% APR: £67 per month, total cost £5,628 (£1,128 interest)

Pros and Cons

  • Pro: Lower interest rates than installer finance (beyond the 0% period)
  • Pro: Independent of installer — you can shop around for quotes
  • Pro: Fixed monthly payments make budgeting straightforward
  • Con: Requires a separate application process
  • Con: Credit check required
  • Con: May need to provide proof the loan is used for energy improvements

Finance Option 3: Home Energy Scotland Interest-Free Loan

Scottish homeowners have access to a particularly attractive option: interest-free loans of up to £7,500 through Home Energy Scotland, repayable over up to 10 years. This is in addition to the available grants.

Terms

  • Interest rate: 0%
  • Maximum amount: £7,500
  • Repayment period: up to 10 years
  • Monthly payment on £5,000 over 10 years: £41.67

Combined with the available grants, this can make a heat pump installation cost nothing up front for Scottish homeowners. The monthly loan repayment is often less than the monthly saving on energy bills, making it cash-flow positive from day one.

Finance Option 4: Adding to Your Mortgage

Some homeowners choose to add the heat pump cost to their mortgage, either through a further advance, a product transfer with additional borrowing, or a green mortgage product.

How It Works

  • Contact your mortgage lender about additional borrowing for home improvements
  • Some lenders (like Nationwide) offer green additional borrowing at preferential rates
  • The additional amount is added to your mortgage balance
  • You repay it over your remaining mortgage term

Example: £4,500 Added to Mortgage

  • Over 20 years at 4.5%: £28 per month, total cost £6,720 (£2,220 interest)
  • Over 10 years at 4.5%: £47 per month, total cost £5,640 (£1,140 interest)

Pros and Cons

  • Pro: Lowest monthly payments (spread over longest term)
  • Pro: Mortgage rates are typically lower than personal loan rates
  • Pro: No additional credit check if using existing lender
  • Con: Total interest paid is higher because of the longer term
  • Con: The debt is secured against your home
  • Con: May trigger fees or require a property valuation
  • Con: Not available if you do not have a mortgage or have limited equity

Finance Option 5: Credit Cards (Short-Term Only)

For smaller remaining balances (under £2,000-£3,000), a 0% purchase credit card can be an effective short-term finance tool.

How It Works

  • Apply for a credit card offering 0% on purchases (typically 12-24 months)
  • Pay the installer's deposit or remaining balance on the card
  • Pay off the balance within the 0% period

Pros and Cons

  • Pro: Genuinely 0% if paid off within the promotional period
  • Pro: Section 75 consumer protection on purchases over £100
  • Con: Interest rates after the 0% period are typically 20-25% APR — very expensive
  • Con: Only suitable for smaller amounts you are confident of repaying quickly
  • Con: Not all installers accept credit card payments, or may charge a processing fee

Finance Option 6: Pay-As-You-Save (Emerging Models)

Some companies are developing pay-as-you-save models for heat pumps, where the monthly payment is designed to be equal to or less than your current heating bill. The idea is that you switch to a heat pump with no up-front cost and pay a fixed monthly amount that is offset by your energy savings.

These models are still emerging in the UK market. They typically involve a lease or rental agreement rather than ownership, which has implications for maintenance responsibility, end-of-term options, and property sale. Read the terms carefully and compare the total cost over the full term against buying outright with a conventional loan.

How to Choose the Right Finance Option

If You Can Pay Within 24 Months

Use installer 0% finance or a 0% credit card. You pay no interest, so the total cost is the same as paying cash.

If You Need 3-7 Years

A green personal loan typically offers the best rates (5-7% APR). The total interest cost is moderate and the monthly payments are manageable. In Scotland, the interest-free HES loan is the clear winner.

If You Need Lowest Monthly Payments

Adding to your mortgage gives the lowest monthly payments but the highest total interest cost. Only choose this if the monthly payment amount is the primary constraint.

If You Are On a Low Income

Check eligibility for ECO4, local authority schemes, or (in Scotland) Home Energy Scotland grants and loans. These schemes can cover the full cost, making finance unnecessary.

The Numbers That Matter: Monthly Cost After Finance

The real question is: what will the heat pump cost you per month, including both the finance repayment and the running cost? Here is an example for a three-bedroom semi replacing gas:

  • Installation cost after BUS grant: £3,000
  • Current gas bill (heating portion): £73/month average

Scenario A: 0% Finance Over 24 Months

  • Finance payment: £125/month
  • Heat pump running cost: £58-£78/month (depending on tariff)
  • Total monthly cost: £183-£203
  • After finance paid off (month 25+): £58-£78/month (saving £0-£15/month vs gas)

Scenario B: Green Loan Over 5 Years at 5.9%

  • Finance payment: £58/month
  • Heat pump running cost: £58-£78/month
  • Total monthly cost: £116-£136
  • After finance paid off (year 6+): £58-£78/month

Scenario C: Cash Purchase

  • Up-front cost: £3,000
  • Heat pump running cost: £58-£78/month
  • Monthly cost from day one: £58-£78 (saving £0-£15/month vs gas)

Even with finance, the total monthly cost is manageable. And once the finance is paid off, you have 15-18 years of lower heating bills ahead of you. Use our calculator to estimate your specific monthly costs.

Things to Watch Out For

Deferred Interest (Buy Now Pay Later)

Some finance deals offer a deferred payment period where you pay nothing for 6-12 months. Check whether interest is accruing during this period. If it is, and you do not pay the full balance by the end of the deferral period, you may owe significant back-interest.

Variable Rate Finance

Some longer-term finance products have variable interest rates that can increase. Fixed-rate products give you certainty about your monthly payments. Wherever possible, choose a fixed rate.

Early Repayment Charges

Check whether you can repay the finance early without penalty. Most personal loans and installer finance allow early repayment, but some products charge a fee. If your circumstances improve and you can pay off the balance early, you do not want to be penalised.

Ownership and Warranty

With a loan or finance agreement, you own the heat pump from day one. With a lease, rental, or pay-as-you-save model, you may not. Ensure you understand who owns the equipment, who is responsible for maintenance, and what happens if you sell the property.

For full details on installation costs before considering finance, see our heat pump cost guide. To get quotes from MCS-certified installers who offer finance options, use our free quote service.

Frequently Asked Questions

Can I get a heat pump with no money down?

In some cases, yes. If the BUS grant covers the full cost of a simpler installation (possible for some properties where the total is £7,500 or less), you pay nothing. Otherwise, 0% finance or deferred payment plans allow you to start with zero up-front cost. Low-income households may qualify for ECO4 or other schemes that cover the full cost.

Is heat pump finance regulated?

Yes. Consumer credit in the UK is regulated by the Financial Conduct Authority (FCA). Any installer offering finance must either be FCA-authorised or act as an appointed representative of an authorised firm. You have the same consumer protections as with any other form of regulated credit, including cooling-off periods and dispute resolution.

Will a finance application affect my credit score?

A full credit application will leave a hard search on your credit file, which can temporarily affect your score. Some providers offer a soft search pre-approval that does not affect your credit score, allowing you to check eligibility before committing. Ask the finance provider or installer which type of search they use.

Can I combine the BUS grant with finance?

Absolutely. The BUS grant reduces the installation cost, and you finance only the remaining balance. This is the standard approach. Your installer handles the grant application, and the finance covers only what the grant does not.

What if I cannot get approved for finance?

If you are declined for conventional finance, check eligibility for ECO4 or local authority schemes, which do not require credit checks. You could also save towards the installation — the BUS grant is currently confirmed until 2028, giving you time to build funds. Some installers also accept staged payments (deposit plus progress payments) which can be easier to manage than a single lump sum.

Is it better to pay cash or use 0% finance?

If 0% finance is available, it is mathematically better to use it even if you have the cash. You can keep your money earning interest in a savings account while paying the finance at 0%. Just ensure you set aside the funds and pay off the balance before the 0% period ends and a higher rate kicks in.