BUS Grant Eligible · MCS-Partner Installed · UK-Wide Coverage
Air Source Heat Pumps UK —
Low Carbon Home Heating With a £7,500 Government Grant
Upgrade to an energy-efficient air source heat pump and reduce your heating bills with a proven low-carbon solution. Compliant Retrofits helps homeowners across the UK access the £7,500 Boiler Upgrade Scheme (BUS) grant — with expert installation from first assessment through to commissioning.
BUS Grant: £7,500
Oil/LPG Homes: £9,000
MCS-Partner Installed
UK-Wide
Free Survey
Why Heat Pumps
Lower Heating Bills £7,500 Government Grant
An air source heat pump (ASHP) extracts heat from the outside air to warm your home and hot water — a low-carbon alternative to gas boilers, eligible for a £7,500 government grant. It operates effectively even in cold UK winters, typically down to −15°C.
Lower Heating Bills
Heat pumps are 300–400% efficient — for every 1 unit of electricity used,
they produce 3–4 units of heat. Heat pump running costs: £700–£900/yr on
a standard tariff, or £500–£700/yr on a smart off-peak tariff.
Gas boiler comparison: £800–£1,000/yr on a standard tariff.
£7,500 Government Grant Available
The Boiler Upgrade Scheme (BUS) provides £7,500 for gas-connected homes
or £9,000 for oil or LPG properties towards installation costs.
The grant is deducted from your quote — you do not claim it back. We handle all
grant paperwork through our MCS-certified installation partners.
Reduce Your Carbon Footprint
Heat pumps produce zero direct on-site emissions. Running on renewable
electricity, they can be nearly carbon neutral — reducing your home’s carbon
footprint by 50–70% compared to a gas boiler, supporting a cleaner,
more sustainable home.
No Fuel Deliveries
No oil tanks. No gas delivery scheduling. No LPG cylinders to monitor.
Heat pumps run entirely on electricity — eliminating fuel-storage risks,
price volatility from delivery-based fuels, and the hassle of arranging
supply at the right time.
Heating & Cooling in One System
Reversible (reverse-cycle) heat pump models can provide cooling in summer
as well as heating in winter — replacing separate air conditioning units.
A single system handles both requirements efficiently year-round.
How It Works
How Does an Air Source Heat Pump Work?
An air source heat pump absorbs renewable heat energy from the outside air — even in temperatures as low as −15°C — then compresses it to a higher temperature to provide efficient heating and hot water for your home.
Operates effectively down to −15°C — well within typical UK winter conditions
1
Absorb
A fan draws outside air over refrigerant fluid inside the outdoor unit. The refrigerant evaporates at low temperature, absorbing heat energy from the air — even in cold conditions.
2
Compress
The refrigerant gas passes through the compressor. Compression raises the temperature significantly — typically to 50–70°C — ready to heat your home’s radiators or underfloor heating.
3
Transfer
The hot refrigerant passes through a plate heat exchanger, transferring heat to your central heating water. This heats your radiators or underfloor heating system and your hot water cylinder.
4
Release & Repeat
The refrigerant expands, cooling back to a liquid state, and the cycle repeats. The cold liquid is ready to absorb more heat from the outside air continuously and efficiently.
Home Suitability
Is Your Home Suitable for an Air Source Heat Pump?
Most UK homes can benefit from an air source heat pump, particularly those with good insulation and sufficient outdoor space for the unit. Our experts assess your property’s insulation, heating system, and energy requirements to recommend the most efficient and cost-effective solution.
Good Insulation Improves Performance
Heat pumps produce lower water temperatures (40–55°C) than gas boilers
(60–75°C), so they work best with good building fabric —
insulated walls, roof, and floor — and larger radiators or underfloor heating.
Homes with poor insulation will see higher running costs. We assess insulation levels
during the free survey and can help with upgrades through ECO4 funding
where applicable.
Suitable for Most UK Homes
Modern heat pumps work effectively in well-insulated homes across the UK.
Older properties may need insulation upgrades first — loft, cavity wall,
or solid wall insulation — before a heat pump is the most cost-effective choice.
Property types well-suited to heat pumps:
- 1930s–1990s semis and detached (typically have cavity walls)
- Modern homes (post-1990, already good insulation)
- Victorian/Edwardian terraces with solid wall insulation
- New builds (excellent insulation levels)
Space Requirements
Two items need to fit in your property — an outdoor unit and an indoor
hot water cylinder. Both are straightforward for most UK homes.
Outdoor Unit
Similar in size to an air conditioning condenser — approx. 800 × 800 × 800mm minimum. Requires 300–500mm clearance on sides and 1,000mm above.
Indoor Cylinder
A hot water cylinder is required if not already present — typically 500–800mm wide × 1,200–1,800mm tall. Usually installed in an airing cupboard or utility room.
Not Sure? We’ll Assess Your Property
Not every home is ready for a heat pump today — and we’ll tell you honestly.
Our free consultation includes a full assessment of your building fabric, existing
heating system, hot water demand, and EPC rating. If insulation upgrades are needed
first, we’ll identify available options including ECO4 funding. Only then do we
recommend the right system for your home.
How We Work
How Is an Air Source Heat Pump Installed?
Each installation is designed around your property’s heating demand, existing infrastructure, and insulation levels — from the first survey through to commissioning and BUS grant submission.
1
Free Consultation & Survey
We assess your property’s insulation, existing heating system, and suitability
for a heat pump. We review your EPC, check insulation levels, and confirm BUS grant
eligibility — before any design or commitment.
2
System Design
We design the system using a full heat-loss calculation — not floor area alone.
This determines the correct heat pump size (typically 5–12 kW for a UK home),
radiator or underfloor heating requirements, and hot water cylinder sizing.
3
Installation
- Outdoor unit on concrete base or wall brackets
- Hot water cylinder (if required)
- Buffer tank (if required by system design)
- Refrigerant pipes and electrical connections
- Modify or replace radiators where needed
- Fill, flush, and pressure test the system
4
Commissioning & Grant
We commission the system and configure controls — including weather compensation
and time-of-use scheduling. Our MCS-certified installation partners handle all BUS
grant paperwork and registration on your behalf.
Costs & Grants
How Much Does an Air Source Heat Pump Cost After the BUS Grant?
The cost of installing an air source heat pump depends on the property size, system capacity, insulation level, and whether your home is connected to mains gas or is off-grid. The Boiler Upgrade Scheme (BUS) provides a £7,500 grant for gas-connected homes and up to £9,000 for oil or LPG properties, significantly reducing installation costs.
| Property Type | System Size | Cost Before Grant | BUS Grant | Your Cost After Grant | Typical For |
|---|---|---|---|---|---|
| Mains Gas Home | 5 kW | £7,000–£9,000 | £7,500 | £0–£1,500 | 1–2 bed flats & small terraces |
| Mains Gas Home | 8 kW | £8,000–£11,000 | £7,500 | £500–£3,500 | Typical 3-bed semi-detached home |
| Mains Gas Home | 12 kW | £10,000–£13,000 | £7,500 | £2,500–£5,500 | Large 4+ bed detached homes |
| Off-Gas (Oil/LPG) | 8 kW | £8,000–£11,000 | £9,000 | £0–£2,000 | Oil/LPG 3-bed semi-detached home |
| Off-Gas (Oil/LPG) | 12 kW | £10,000–£13,000 | £9,000 | £1,000–£4,000 | Large off-grid detached properties |
BUS Grant — Key Conditions
The BUS grant applies to air-to-water heat pumps only
(not air-to-air). One grant per eligible property. Must be installed by
an MCS-certified installer. The grant is applied at point of installation —
you do not claim it back. Available to homeowners in England and Wales.
Running Cost Comparison
Heat pump: £700–£900/yr on a standard tariff,
or £500–£700/yr on a smart/off-peak electricity tariff.
Gas boiler comparison: £800–£1,000/yr (standard tariff).
Running costs vary by property size, insulation, and energy tariff.
Indicative figures only. All costs, savings, and payback periods shown
are planning estimates, not fixed quotations. Actual costs depend on measured heat loss,
insulation levels, existing heating system, energy tariffs, and electrical infrastructure.
A professional site survey is required before final system sizing and costs can be confirmed.
BUS grant figures verified July 2026.
Our Approach
Why Choose Compliant Retrofits for Air Source Heat Pump Installation?
At Compliant Retrofits, we provide complete air source heat pump solutions designed to maximise efficiency, reduce heating bills, and ensure full compliance with UK government grant schemes — from first survey through to commissioning.
1
MCS-Partnered Installations
We work with MCS-certified installation partners for all BUS-funded work, ensuring your system meets the requirements of the Boiler Upgrade Scheme. BUS grant applications are submitted through MCS-certified installers.
2
BUS Grant Specialists
We handle the entire Boiler Upgrade Scheme process — eligibility checks, application submission, and documentation. You do not need to deal with the grant paperwork. We manage everything on your behalf.
3
Whole-System Approach
We assess insulation levels and heat loss before specifying the heat pump — not the other way around. Where insulation upgrades are needed first, we can help identify ECO4 funding options to improve your building fabric.
4
Fixed, Transparent Pricing
All pricing is fully upfront with no hidden costs. You receive a clear, itemised quotation based on your property’s heat demand, system requirements, and applicable grant funding — before any work begins.
5
Free Consultation & Grant Check
We provide a no-obligation initial assessment to evaluate your property, confirm BUS grant eligibility, and recommend the most efficient heat pump system for your home. No commitment required.
6
UK-Wide Coverage
Compliant Retrofits delivers air source heat pump installations across the UK, working with a network of certified installation partners to serve homeowners wherever their property is located.
FAQs
Frequently Asked Questions About Air Source Heat Pumps
1
Do I need to replace my radiators for a heat pump?
Heat pumps work best with larger radiators or underfloor heating,
as they produce lower flow temperatures (40–55°C) than boilers (60–75°C).
Your existing radiators may be adequate if they are already oversized — for example,
Type 22 double-panel rather than Type 11 single-panel. We assess and advise on radiator
sizing during the site survey, so you know exactly what changes are needed before
any commitment.
2
Will a heat pump work in cold UK winters?
Yes. Modern heat pumps operate effectively down to −15°C.
UK winter temperatures rarely fall below −10°C even in the coldest regions,
and most parts of England and Wales experience lows of −5°C or above.
Your heat pump will continue to operate efficiently throughout the year.
3
How long does an air source heat pump last?
With proper maintenance, a heat pump should last 15–20 years —
compared to 10–15 years for a gas boiler. Heat pumps have fewer moving parts
than combustion-based systems, contributing to their longevity. We recommend an annual
service to maintain efficiency and warranty validity.
4
Can I get a government grant for a heat pump?
Yes. The Boiler Upgrade Scheme provides £7,500 for gas-connected
homes and £9,000 for oil or LPG properties towards
the cost of an eligible air-to-water heat pump. There is no income limit —
the grant is available to all homeowners in England and Wales. It is applied at the
point of installation; you do not claim it back afterwards.
5
Can I combine a heat pump with solar panels?
Yes. Solar panels generate electricity to power your heat pump, which can significantly
reduce running costs — particularly for homes with moderate-to-high daytime
heating or hot water demand. Pairing a heat pump with solar panels and battery storage
is one of the most effective combinations for reducing both bills and carbon emissions.
We can advise on this during your free consultation.
Get Started Today
Ready to Install an Air Source Heat Pump in Your UK Home?
Book a free consultation — we’ll assess your BUS grant eligibility, carry out a heat-loss survey, and provide a fixed-price system design. No obligation, 24-hour response.
We respond within 24 hours
Phone
Address
Unit 26, Longsight Business Park,
69 Hamilton Road, Manchester M13 0PD
69 Hamilton Road, Manchester M13 0PD