Real Homes · Real Savings

Case Studies

Every installation is different. Here are six real projects — from full whole-home systems to single battery upgrades — with honest numbers.

4,000+
Installations
£7,500
Max Grant Secured
£1,850
Avg Annual Saving
100%
Grant Admin by Us
🏡Case Study #1£7,500 BUS Grant

Full renewable ecosystem — £2,900 annual saving

Brentwood, Essex · 4-bed detached

SolarBatteryHeat PumpEV Charger

The Challenge

Large family home with high energy bills (£4,200/yr) and an ageing gas boiler needing replacement. South-facing roof with minor chimney shading.

Our Solution

Complete system: 12× AIKO 440W panels, Huawei SUN2000 inverter, GivEnergy 9.8 kWh battery, Vaillant arotherm plus 7kW heat pump, and Myenergi Zappi EV charger. Qualified for the full £7,500 BUS grant.

Products Installed

  • AIKO Neostar A 440W (×12)
  • Huawei SUN2000-6KTL
  • GivEnergy All-in-One ×4
  • Vaillant arotherm plus 7kW
  • Myenergi Zappi v2.1

"Heat Smart handled everything — the survey, grant paperwork, and a flawless one-week install. We've not had a gas bill since."

— James & Sarah T., Brentwood

Results

Solar Array
5.28 kW
Battery Capacity
9.8 kWh
Annual Saving
£2,900
Grant Received
£7,500
Payback Period
5.2 yrs
CO₂ Saved
2.4 t/yr
⚡Case Study #2

Solar + battery earns £380/yr via Smart Export Guarantee

Cardiff, Wales · 3-bed semi-detached

SolarBatterySEG

The Challenge

Homeowner working from home with high daytime usage. East-west split roof — not ideal for a single string, but with the right inverter still a strong performer.

Our Solution

10× LONGi Hi-MO X6 430W panels on east-west split with SolarEdge Home Hub for per-panel optimisation. GivEnergy All-in-One 2.0 battery stores morning generation for evening use. Registered for SEG with Octopus Energy.

Products Installed

  • LONGi Hi-MO X6 430W (×10)
  • SolarEdge Home Hub 5kW
  • GivEnergy All-in-One 2.0 (×2)

"Even with our awkward roof, the system produces far more than I expected. The SolarEdge monitoring shows each panel individually — brilliant."

— Priya M., Cardiff

Results

Solar Array
4.3 kW
Battery Capacity
5.2 kWh
Annual Saving
£1,640
SEG Income
£380/yr
Self-Consumption
84%
Payback Period
6.8 yrs
🌡️Case Study #3£7,500 BUS Grant

1930s terrace runs on a heat pump — £7,500 grant claimed

Manchester · 1930s terrace

Heat PumpBUS Grant

The Challenge

Period terrace with solid walls. Many installers said heat pumps "wouldn't work" here. After a fabric-first assessment (loft and underfloor insulation), the property was heat-pump-ready.

Our Solution

Mitsubishi Ecodan 8.5kW paired with a new low-temperature radiator circuit. Full BUS grant application handled by Heat Smart — £7,500 deducted from the invoice on day one.

Products Installed

  • Mitsubishi Ecodan R32 8.5kW
  • Mitsubishi Ecodan Cylinder 250L
  • Low-temperature radiator upgrade

"Everyone told me my house was wrong for a heat pump. Heat Smart proved them wrong. Warm all winter, bills down by a third."

— David R., Salford

Results

Heat Pump Output
8.5 kW
SCOP Achieved
3.9
Annual Saving
£1,100
Grant Received
£7,500
Old Boiler Age
22 yrs
Payback Period
4.1 yrs
🚗Case Study #4

New-build solar + Zappi — charging EV for near-zero cost

Bristol · 3-bed new-build

SolarEV Charger

The Challenge

New-build with a south-facing roof and a Nissan Leaf. Wanted to charge the car from solar rather than the grid and avoid wasted export.

Our Solution

8× AIKO 440W panels (3.52 kW) with Huawei SUN2000 inverter. Myenergi Zappi in ECO+ mode — charges the car only when there is surplus solar, eliminating export waste entirely. Average home charge cost: under 1p/kWh.

Products Installed

  • AIKO Neostar A 440W (×8)
  • Huawei SUN2000-4KTL
  • Myenergi Zappi v2.1 7kW

"The Zappi is genius. My car charges itself from the roof. In summer I've not paid a penny for fuel in weeks."

— Ola F., Bristol

Results

Solar Array
3.52 kW
Charge Rate
7 kW
Annual Saving
£980
EV Fuel Cost
~0p/kWh
Grid Export
< 5%
Payback Period
7.1 yrs
🏠Case Study #5ECO4 Fully Funded

ECO4-funded solar and insulation — zero upfront cost

Leeds · 2-bed mid-terrace

SolarECO4Insulation

The Challenge

Low-income household on a prepayment meter spending over £2,100/yr on energy. Property was EPC band E — eligible for ECO4 funding.

Our Solution

ECO4 LA Flex referral covered 100% of costs: loft and cavity wall insulation, 6× LONGi panels, and battery storage. Household moved from EPC E to EPC B. No upfront cost to the customer.

Products Installed

  • LONGi Hi-MO X6 430W (×6)
  • GivEnergy All-in-One 2.0
  • Cavity wall insulation
  • Loft insulation 300mm

"I didn't believe it was real at first — fully funded solar and insulation at no cost. Heat Smart handled every bit of paperwork."

— Margaret L., Leeds

Results

Solar Array
2.58 kW
EPC Before
Band E
EPC After
Band B
Annual Saving
£1,480
Upfront Cost
£0
Grant Value
~£14,000
🔋Case Study #6

Battery-only install slashes bills on Agile tariff

Islington, London · Victorian flat (leasehold)

BatteryTariff Optimisation

The Challenge

Top-floor flat — no roof access for solar. High bills due to variable Octopus Agile tariff peaks. Wanted to use cheap overnight rates without rooftop panels.

Our Solution

GivEnergy All-in-One 2.0 (2.6 kWh) installed in the utility cupboard. Charged automatically at 1–5p/kWh overnight (Agile), discharges during 4–7pm peak periods (often 35–50p/kWh). Simple, clean, no planning needed.

Products Installed

  • GivEnergy All-in-One 2.0

"No roof, no problem. The battery just works — charges cheaply at night and keeps me off the grid during expensive peak hours."

— Tom K., Islington

Results

Battery Capacity
2.6 kWh
Avg Charge Cost
3p/kWh
Annual Saving
£620
Peak Avoided
35–50p/kWh
Install Time
4 hrs
Payback Period
5.6 yrs
Your Turn

Ready to See Your Numbers?

Get a free site survey and personalised savings report — we'll show you exactly what your home could achieve.

Book a Free SurveyCheck My Grants →