CASE STUDY · SOCIAL HOUSING — DECARBONISATION
Wales and West Housing Association — Heol Dwr, Pembrokeshire: 16-Property ASHP Retrofit
Replacing inefficient electric storage heaters with bespoke Air Source Heat Pump systems and Sunamp hot water units across 16 occupied domestic properties in Fishguard, Pembrokeshire.
CLIENT
Wales and West Housing Association
PROJECT TYPE
Heating decarbonisation across 16 occupied homes — electric storage heaters replaced with ASHP + Sunamp hot water
FORM OF CONTRACT
Turnkey domestic retrofit — competitive procurement
SCHEME SIZE
16 occupied domestic properties
LOCATION
Heol Dwr, Fishguard, Pembrokeshire
TIMELINE
September–December 2024 (4-month programme)
Project highlights
16 occupied homes successfully retrofitted
100% MCS compliance
Completed on schedule and within budget
Significant reduction in residents’ annual energy expenditure
Existing Solar PV integrated with new Sunamp hot water systems
No resident left without heating or hot water for more than one working day
Outcomes and KPIs achieved
100% programme completion on time
98% first-time pass rate at quality inspection
100% certification issued within the agreed timeframe
100% MCS compliance
Customer satisfaction exceeding 95%
Zero recorded complaints
Challenges, solutions and lessons learned
Challenge
Delivering disruptive retrofit works within occupied homes, including properties with vulnerable residents.
Solution
Enhanced Tenant Liaison Officer support, flexible scheduling, safeguarding-trained teams and tailored one-to-one communication.
Challenge
Correctly sizing and positioning heat emitters within relatively small properties.
Solution
Room-by-room heat loss calculations and close collaboration with residents to agree radiator positioning while maintaining the 40°C design flow temperature.
Compliance and certifications
Overview
Replacing legacy electric storage heaters with high-efficiency Air Source Heat Pumps delivered a significant reduction in residents’ annual energy expenditure and reduced the estate’s overall carbon footprint across 16 occupied homes in Heol Dwr, Fishguard.
The programme was completed on schedule and within the £251,362.16 budget, with 100% of properties achieving MCS compliance, while supporting wider regional Net Zero objectives.
Measures and technologies
- High-efficiency Vaillant Air Source Heat Pumps across 16 properties
- New wet central heating systems
- Energy-efficient radiators
- Sunamp phase-change-material hot water units
- MYEDDI Solar diverters integrated with existing PV
- Decommissioning and removal of electric storage heaters
- Domestic consumer unit upgrades
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