Hybrid vs Air Source Heat Pump for Landlords

What a hybrid heat pump is

A hybrid heat pump is a smaller heat pump paired with a gas boiler, with a controller that chooses which one runs. It is not the same product as a full air source heat pump, which replaces the boiler entirely. We publish guides and do not install either, so treat this page as a way to frame the questions for an independent firm.

In practice the heat pump takes the milder days and the boiler covers the coldest spells or hot water peaks, depending on the design. The exact split depends on the model, the controls and the home, which is why two quotes for a hybrid can look very different.

The grant position is the main difference

Hybrids are not funded by the Boiler Upgrade Scheme. The GOV.UK eligibility rules say the grant is for a heat pump that replaces existing heating, with one grant per property, and they exclude hybrids.

The funding for a full system looks like this:

Option	Boiler Upgrade Scheme grant
Air source heat pump (air to water)	£7,500
Ground source heat pump	£7,500
Air to air heat pump (must replace existing heating)	£2,500
Hybrid heat pump	None
Like-for-like gas boiler	None

The £7,500 figure applies to a mains-gas home. The uplift to £9,000 applies only where oil or LPG heating is replaced and there is no mains gas connection, from 21 July 2026 to 31 March 2027. Landlords are eligible: the rules say you must own the property you are applying for, including a property you rent out to tenants. The installer applies on the owner’s behalf. The full detail is on the Boiler Upgrade Scheme for landlords page.

If a property qualifies, a £7,500 grant on a full system is a large gap to a hybrid that gets nothing. The cost of the two options needs comparing on the same basis: installed price minus any grant, not headline price.

When a hybrid is the sensible choice

A hybrid can make sense where a full heat pump is awkward and you still want to reduce gas use. Typical cases:

• The radiators are small and the fabric is poor, so a full heat pump would need a lot of extra work first.
• The property is a flat or terrace with no workable position for a larger outdoor unit.
• You plan to replace the heating in stages and want a lower-risk first step.

The honest limit is that a hybrid keeps a gas boiler, a gas supply, an annual gas safety check and the tenant’s gas bill. It also cannot be funded by the main grant. Whether it helps with the planned EPC rules is unknown (see below).

When a like-for-like boiler is the sensible choice

Replacing a failed boiler with another boiler is a legitimate decision, not a failure. It fits when the heating has stopped, tenants are without hot water, and a heat pump project would take weeks to design and install. It also fits when the building fabric needs work first and the money is better spent on insulation.

Be clear about the trade-off, though. A new boiler does nothing for the planned EPC C requirement by itself, and it may be money spent on a system you replace again later. If the boiler is not failing, waiting until you have a plan for the whole property is often cheaper than two projects.

What this means for EPC rules

Today’s law is a minimum of EPC E for most lettings, with a cost cap of £3,500 including VAT. The government has said it plans to require EPC C by 1 October 2030, but the regulations have not been laid, and a statutory instrument is expected in 2027. The planned design is a dual metric: a fabric performance standard first, then the landlord chooses a heating-system standard or a smart-readiness standard.

What we have not verified is whether a hybrid would meet the heating-system standard. The government response does not settle it, and we have not found a primary source that does. Until it does, a hybrid is a bet on the final rules, while a full heat pump is the option most likely to be treated as low-carbon heating. Read EPC C by 2030 and your heating choice and whether heat pumps improve an EPC rating before you commit.

A short decision checklist

1. Is the property eligible for the grant? Check it is not new build, social housing or already funded for a heat pump.
2. Does the home have the fabric, the radiators and the outdoor space for a full system?
3. Is the boiler failing now, or can you plan?
4. Have you asked each firm to quote both options, with the grant shown separately?
5. Have you checked the firm is on the MCS register yourself?

If you want a rough comparison, the heat pump landlord calculator is the next step, and you can send an enquiry through the quote page: relevant independent firms contact you, with no charge and no obligation.