Warm Homes Plan vs ECO4 vs Boiler Upgrade Scheme: Which One Applies To You?

If you’ve searched for help with energy bills or home upgrades in the UK, you’ve probably come across a confusing mix of schemes: the Warm Homes Plan, ECO4, the Boiler Upgrade Scheme, and the Warm Home Discount. They’re often mentioned together, sometimes even used interchangeably—but they are not the same thing.

This confusion stops many households from applying at all.

This guide compares the main UK Help to Heat schemes in 2025–26 in clear, everyday language. We’ll explain what each scheme does, who qualifies, how much support is available, and—most importantly—how these schemes can work together rather than compete.

Why There Are So Many Energy Schemes

The UK has a big challenge: millions of homes are expensive to heat, poorly insulated, and heavily reliant on gas. No single scheme can fix everything.

Instead of one mega-programme, the government uses multiple schemes, each targeting a different problem:

• Fuel poverty
• Inefficient housing
• Outdated heating systems
• Rising energy costs

The Warm Homes Plan sits above many of these schemes as a long-term strategy, while ECO4, the Boiler Upgrade Scheme (BUS), and the Warm Home Discount each play specific roles.

Understanding which scheme applies to you depends on:

• Your home
• Your heating system
• Your income or benefits
• What upgrades you’re considering

Let’s break them down one by one.

What Is the Warm Homes Plan?

The Warm Homes Plan is a long-term UK government energy framework rather than a single grant.

Think of it as the umbrella strategy for improving homes between the mid-2020s and early 2030s.

What the Warm Homes Plan Does

• Focuses on reducing heat loss first
• Supports insulation, heating upgrades, and renewables
• Combines grants and low-cost loans
• Targets homes with high energy demand and poor efficiency

Who It’s For

• Homeowners
• Private landlords
• Low- and middle-income households
• Older or inefficient homes

What It Can Fund

• Insulation (loft, walls, floors)
• Heat pumps
• Heating system upgrades
• In some cases, solar and battery storage

The Warm Homes Plan doesn’t replace existing schemes. Instead, it connects and coordinates them.

What Is ECO4?

ECO4 (Energy Company Obligation Phase 4) is one of the most important ECO4 grants available in the UK today.

It requires large energy suppliers to fund energy efficiency upgrades for eligible households.

Who Qualifies for ECO4?

ECO4 is primarily for:

• Low-income households
• People receiving certain benefits
• Homes with poor EPC ratings (usually D–G)

Eligibility depends on both income and property condition.

What ECO4 Can Fund

• Loft insulation
• Cavity or solid wall insulation
• Heating system improvements
• In some cases, first-time central heating

ECO4 is especially focused on whole-house improvements, not cosmetic fixes.

Typical Funding

• Often covers 100% of costs
• No repayment required
• Funding amounts vary based on property needs

ECO4 is one of the most generous schemes—but also one of the most tightly targeted.

What Is the Boiler Upgrade Scheme (BUS)?

The Boiler Upgrade Scheme focuses on one thing: replacing fossil-fuel heating with low-carbon alternatives.

It’s not about insulation or income—it’s about the heating system.

Who Qualifies for BUS?

• Homeowners in England and Wales
• Homes replacing gas, oil, or LPG boilers
• Properties with sufficient insulation already in place

BUS is not means-tested, which surprises many people.

What the Boiler Upgrade Scheme Funds

• £7,500 grant for air-source heat pumps
• £7,500 grant for ground-source heat pumps

The grant is paid directly to the installer, reducing the upfront cost for the homeowner.

Key Limitation

BUS does not pay for:

• Insulation upgrades
• Radiator replacements beyond minimum requirements
• Electrical upgrades not linked to the heat pump

That’s why BUS often works best alongside other schemes.

What Is the Warm Home Discount?

The Warm Home Discount is very different from the other schemes.

It’s not about upgrading your home—it’s about short-term bill support.

Who Qualifies?

• Pensioners on the Guarantee Credit element of Pension Credit
• Low-income households meeting supplier criteria

What It Provides

• A one-off discount (typically £150) on your electricity bill
• Applied automatically or via supplier application

What It Does Not Do

• No home improvements
• No insulation
• No heating upgrades

The Warm Home Discount helps with affordability today, not efficiency tomorrow.

Comparison Table: Warm Homes Plan vs ECO4 vs BUS vs Warm Home Discount

Below is a simple text comparison to make things clearer.

Warm Homes Plan

• Focus: Whole-home efficiency
• Who qualifies: Homeowners & landlords (criteria vary)
• Funding type: Grants + loans
• Measures funded: Insulation, heating, renewables
• Repayment: Grants no, loans yes

ECO4

• Focus: Fuel poverty & inefficient homes
• Who qualifies: Low-income / benefits households
• Funding type: Grant
• Measures funded: Insulation, heating systems
• Repayment: No

Boiler Upgrade Scheme (BUS)

• Focus: Low-carbon heating
• Who qualifies: Homeowners (not means-tested)
• Funding type: Grant
• Measures funded: Heat pumps only
• Repayment: No

Warm Home Discount

• Focus: Bill support
• Who qualifies: Low-income & pensioners
• Funding type: Discount
• Measures funded: None
• Repayment: Not applicable

Can These Schemes Be Combined?

Yes—and this is where many people miss out.

These schemes are not mutually exclusive.

Common Combinations

• ECO4 + Boiler Upgrade Scheme
  Insulation funded by ECO4, heat pump supported by BUS.
• Warm Homes Plan + ECO4
  Grants for insulation, loans for additional upgrades.
• Warm Homes Plan + BUS
  Strategic upgrade path with reduced upfront cost.
• Warm Home Discount + Any Scheme
  Short-term bill relief while planning long-term improvements.

The right combination depends on your home and situation, not just the scheme name.

Which Scheme Applies to You?

Here’s a simplified way to think about it:

• On benefits or low income?
  ECO4 is often the starting point.
• Homeowner wanting a heat pump?
  Boiler Upgrade Scheme may apply.
• Older, inefficient home with high bills?
  Warm Homes Plan framework is relevant.
• Struggling with bills right now?
  Warm Home Discount may help short-term.

Most households don’t neatly fit into one box—which is why guidance matters.

Why People Get Rejected (and What to Do)

Common reasons applications fail:

• Property not suitable
• Missing insulation
• Wrong scheme for the upgrade
• Installer not accredited
• Incomplete information

This doesn’t mean you’re ineligible—it often means you applied to the wrong scheme first.

The Smart Next Step

Rather than guessing, the simplest approach is to:

1. Answer a few questions about your home
2. Match your situation to the right scheme(s)
3. Be connected to a suitable, accredited installer

That’s how most successful applications start.

Final Thoughts

The UK’s Help to Heat schemes are powerful—but only when used correctly.

The Warm Homes Plan, ECO4 grants, Boiler Upgrade Scheme, and Warm Home Discount all exist for good reasons. The key is understanding which applies to you—and how they can work together.

If you’d like help cutting through the confusion, you can fill in a short questionnaire and we’ll help match your home to the right scheme and installer.

A few minutes today could mean warmer winters and lower bills for years to come.