Is a 15-year-old boiler automatically eligible for a grant?

No. Age alone doesn't trigger eligibility. ECO4 needs you to be on qualifying benefits and your home to have an EPC of D or below. BUS doesn't care about age but requires you to install a heat pump or biomass boiler, not a like-for-like replacement.

Can I get a free boiler if my old one still works?

Sometimes. ECO4 prioritises broken heating systems but also covers boilers classed as inefficient or beyond economic repair, which often includes anything 15-plus years old with a G efficiency rating. The installer's surveyor makes the call during the home assessment, and they're generally pragmatic about old systems.

Does BUS pay for a new gas boiler?

No. BUS only funds heat pumps and biomass boilers.

How long does an ECO4 boiler installation take from start to finish?

Typically six to ten weeks from initial application to install. The first stage is benefit verification, then an in-home survey, then scheduling. If your boiler has completely failed and there's a vulnerable person in the home, ask the installer about emergency provisions, which can compress the timeline to two or three weeks.

What if my EPC is older than 10 years?

You'll need a new one before applying for BUS. An EPC costs £60 to £120 and lasts 10 years. ECO4 doesn't strictly need a current EPC for boiler work but installers often arrange one as part of the survey.

Can I combine ECO4 and the Boiler Upgrade Scheme?

Not for the same measure. You can't have both schemes pay for the same heat pump. But you can use ECO4 to fund the insulation that makes your home BUS-eligible, then use BUS for the heat pump itself. That stacking strategy works for households who qualify for both.

Boiler Over 15 Years Old Government Scheme 2026: What You Can Get

Boiler Over 15 Years Old Government Scheme 2026: What You Can Get | Eco Home Check

Is Your Old Boiler Costing You More Than You Think?

A 15-year-old boiler typically runs at 70% efficiency or worse, compared to 92% for a modern condensing model. That's roughly £300 a year leaking out of your gas bill before you factor in repair costs.

Think about what that actually means. If your annual heating bill is £1,200, you're burning around £350 of that just because the boiler is old. Multiply that across the years it has left before total failure and you're looking at £1,500 to £2,000 in pure waste.

And then there's the failure risk.

Boilers over 15 years old fail at roughly three times the rate of boilers under 10, according to the Energy Saving Trust. A breakdown in January costs you a £600 emergency callout, possibly more if parts are obsolete. We see this pattern constantly, people limp their old boiler through one more winter, it dies on the coldest week of the year, and they end up paying full price for a replacement they could have got partly or fully funded if they'd applied for a grant six weeks earlier.

Here's the honest bit. Most people with an old boiler don't realise they qualify for help. The eligibility rules are quirkier than people assume.

Which Government Schemes Cover Old Boiler Replacements in 2026?

Two schemes do the heavy lifting: ECO4 and the Boiler Upgrade Scheme. A third, Warm Homes: Local Grant, covers some households through their council.

ECO4 is the one most relevant to people with old gas boilers. It's funded by energy suppliers, administered through their installer networks, and runs until December 2026. If you receive qualifying benefits, ECO4 can replace your boiler outright at no cost to you. We've covered the eligibility rules in detail separately, but the key point for old boilers is this: a boiler that's broken or beyond economic repair gets prioritised. A 15-plus-year-old boiler with a G-rated efficiency badge often qualifies as "broken heating" even if it still fires up most mornings.

The Boiler Upgrade Scheme works differently. It's for everyone, no income test, and it pays £7,500 towards an air source heat pump, £7,500 towards a ground source heat pump, or £5,000 towards a biomass boiler. It does not pay for a like-for-like gas boiler replacement. So if you want a new combi to replace your old combi, BUS doesn't help you. If you're open to switching to a heat pump, it's the biggest grant in the country. Our full BUS guide walks through the trade-offs.

Warm Homes: Local Grant is the third route. It's £1.8 billion across English councils running until March 2028, with eligibility set locally. Some councils fund full installs for households on low incomes, others top up ECO4 for borderline cases. Cornwall and Manchester run particularly generous schemes. Worth checking your council's website directly.

One scheme worth noting because people keep asking about it: the Great British Insulation Scheme closed in March 2026. Don't waste time looking for it.

Do You Qualify? Eligibility Checks for the Boiler Upgrade Scheme and ECO4

The two schemes have very different eligibility rules, and most people qualify for one or the other.

ECO4 is means-tested. You need to receive one of the qualifying benefits, Universal Credit, Pension Credit, Child Tax Credit, Working Tax Credit, Income Support, or ESA among others. Your home also typically needs an EPC rating of D, E, F, or G. If your home is already a C or higher, ECO4 won't fund a boiler replacement because the scheme targets the least efficient housing stock.

There's also a route called ECO4 Flex. This lets councils refer households who don't claim benefits but are on low incomes or have someone vulnerable to cold in the home. The rules vary council by council, which is annoying but worth checking. We've broken down the Flex routes for pensioners separately.

BUS is the opposite. No income test. No benefits requirement.

What BUS does require:

You own the property (or are a small private landlord)
The property has a valid EPC less than 10 years old with no outstanding loft or cavity wall insulation recommendations
You're replacing fossil fuel heating (gas, oil, LPG, electric) with a heat pump or biomass boiler
The installer is MCS-certified

That insulation point trips people up. If your EPC says "install loft insulation", you need to do that before BUS will pay out. Sometimes councils or ECO4 will fund the insulation, which then makes you BUS-eligible for the heat pump. We've seen households stack these schemes effectively.

If you're a landlord with an old boiler in a rental property, the rules get more complicated. Our landlord EPC guide covers the minimum standards and how grants apply.

How Much Could You Get Towards a New Boiler or Heat Pump?

The range is wide. ECO4 can cover the full cost of a gas boiler replacement (typically £2,500 to £4,000). BUS pays a fixed £7,500 towards a heat pump that costs £10,000 to £14,000 installed.

Here's a rough comparison of what you'd actually pay out of pocket in 2026:

Route	Typical install cost	Grant amount	Your contribution
ECO4 gas boiler replacement	£2,800	Full cost	£0
BUS air source heat pump	£11,000	£7,500	£3,500
BUS ground source heat pump	£18,000	£7,500	£10,500
BUS biomass boiler (rural only)	£14,000	£5,000	£9,000
Warm Homes Local Grant	Varies	Up to full cost	Varies
No grant, self-funded combi	£2,800	£0	£2,800

The ground source figures look brutal but the running costs are dramatically lower. Across 20 years, a ground source heat pump in a well-insulated home will beat a gas boiler by several thousand pounds. The question is whether you can stomach the upfront gap.

One thing most guides won't tell you. The £7,500 BUS grant goes to the installer, not to you. They deduct it from your final invoice. So you never see the money pass through your hands, which has tax and cashflow implications worth knowing before you sign anything.

For a sense of how heat pump pricing has moved this year, our heat pump cost guide has current ranges by property type.

How to Apply for a Government Grant on an Old Boiler

Start with the eligibility checker, not the installer. The order matters.

If you call an installer first, they'll quote you for the work and then try to figure out if you qualify for funding afterwards. That's backwards. Installers don't always know the quirks of ECO4 Flex in your specific council area, and they have an incentive to sell you the install regardless.

The sequence that works:

Run your details through the eligibility checker to see which schemes apply
If ECO4-eligible, contact an Ofgem-registered ECO4 installer. They handle the application end-to-end and the work is fully funded
If BUS-eligible, get an EPC if you don't have one, then approach an MCS-certified heat pump installer who'll handle the grant application
If Warm Homes Local Grant applies, your council will refer you to their preferred installer network

For BUS specifically, the installer applies on your behalf. You don't fill in any government forms. They submit the application, Ofgem confirms eligibility, the £7,500 gets deducted from your invoice. The whole process from quote to install typically takes 8 to 12 weeks.

ECO4 is faster in some ways and slower in others. Faster because there's no EPC requirement first. Slower because installers have to confirm benefit eligibility and arrange a survey before they commit to the job. Six to ten weeks is normal.

One important detail. If your old boiler has completely failed and you're without heat, mention that to the installer or council immediately. There are emergency provisions in ECO4 for households without working heating in winter, particularly if there's a pensioner or someone with a long-term illness in the home. These aren't well advertised. You have to ask.

Honestly, this stage is where most people give up. The paperwork feels overwhelming. But once you've found the right installer, they do almost all of it.

What If You Do Not Qualify? Other Ways to Reduce Your Heating Bills

Not everyone qualifies. If you're earning above the ECO4 thresholds and don't want a heat pump, your options narrow considerably.

A few routes still worth knowing about:

The Warm Home Discount gives £150 off your electricity bill annually if you're on a qualifying benefit. It's not a boiler grant but it offsets some of the running cost of an old system. Most awards are now automatic, no application needed. We've explained the eligibility rules here.

Smart meter installation is free and gives you visibility on what your boiler is actually costing. Households that get smart meters typically cut their energy use by 3% to 5% just through behaviour change. Not transformative, but worth doing.

A hydraulic balance and powerflush on an older boiler costs £300 to £500 and can recover 5% to 10% of efficiency. That's a year or two's worth of fuel savings. Worth considering if you're squeezing two or three more winters out of the boiler before replacement.

And finally, the boring one: insulation. A boiler heats a leaky house badly. Loft insulation costs £300 to £600 and pays back in three to four years. Cavity wall insulation similar. ECO4 funds insulation for benefit-eligible households even if it doesn't fund a boiler replacement on its own. Our insulation grants guide covers the routes.

Look, the honest answer is that if you're earning a normal middle income and want a like-for-like gas boiler swap, there's no government scheme that helps you. You pay the £2,800. The Boiler Upgrade Scheme is the only no-means-test option and it's deliberately designed to push you off gas. That's the policy direction and it isn't changing.