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Domestic Boiler and Loft Replacement under ECO4 Scheme

Project Overview

Project Name: Domestic Heating and Insulation Upgrade
Location: Cheshire, UK
Client: Private Homeowner under ECO4 Scheme
Duration: 3 Weeks (Survey to Completion)

Customer Background

A homeowner in Cheshire, England was living in a cold, hardtoheat detached house with an Frated EPC, rising gas and electricity bills and uncomfortable cold spots in key rooms. The loft had virtually no effective insulation, the 26yearold Potterton Suprima boiler with no controls struggled to heat the home efficiently, and limited ventilation contributed to condensation and poor indoor air quality. The family wanted a longterm solution to reduce bills, improve comfort and protect their health in a property with clear scope for fabric and heating system upgrades.

Objective

  • Replace an inefficient gas boiler with a modern energy-efficient system.
  • Improve thermal comfort and reduce household energy costs.
  • Contribute to carbon emission reduction in line with the UK’s ECO4 energy efficiency targets.
  • Lift the EPC rating and reduce running costs for an Lift the EPC rating and reduce running costs for an Erated property.
  • Improve ventilation to manage moisture and air quality after insulation upgrades.

Scope of Works

  • Full removal of an existing 20-year-old gas boiler providing more reliable heat output, improved efficiency and quieter operation, while preparing the system for modern controls.
  • Installation of a new A-rated condensing boiler with smart controls.
  • Loft insulation upgrade to 270mm to reduce heat loss. This sharply reduces heat escaping through the roof, cuts heating demand and supports a higher EPC rating.
  • Pipework modifications and radiator balancing.
  • New extractor fans were fitted in key moistureproducing rooms to maintain healthy airflow and protect indoor air quality, ensuring that the tighter, betterinsulated building fabric does not lead to condensation or damp issues.
  • Compliance with PAS 2030 retrofit standards, building regulations, and ECO4 reporting requirements.

The Solution

North West Energy Grants Ltd designed a coordinated retrofit package combining loft insulation, a new Worcester Greenstar boiler, upgraded heating controls TTZC and new extractor fans. Together these measures reduce heat loss, improve system efficiency, maintain healthy indoor air quality and make the home significantly more comfortable and affordable to run.

Methodology

Survey & Assessment

  • Conducted pre-installation energy survey, including EPC review and thermal imaging of the loft and pipework.
  • Identified high heat-loss areas and evaluated boiler location for optimal system efficiency.

Quality Control

  • Highperformance mineral wool loft roll, a Worcester Greenstar 400 30kw boiler, efficient extractor fans and modern heating controls TTZC were selected to provide strong thermal performance, reliable operation and longterm comfort for the occupants.
  • Identified high heat-loss areas and evaluated boiler location for optimal system efficiency.

Installation Process

  • Coordinated installation schedule with homeowner to minimize disruption.
  • Loft and ventilation checks were completed first, added loft insulation to recommended depth and secured all areas for long-term performance by NVQ qualification holder
  • Safely removed old boiler and installed the new system in line with Gas Safe regulations and by gas safe registered engineer.
  • Commissioned the system and provided the homeowner with user guidance and maintenance advice.

Outcomes & Benefits

Social Value Delivered

  • Installation completed by local engineers, supporting local employment.
  • One apprentice trained in boiler installation and loft insulation techniques.
  • Material reuse and waste minimization aligned with environmental best practice.

Challenges & Solutions

  • Restricted loft access: Used specialist loft ladder and insulation blower equipment to safely complete work
  • Homeowner scheduling constraints: Flexible installation plan with evening and weekend support.
  • ECO4 reporting requirements: Pre- and post-installation data collected on in house application and CRM portal and documented to provide audit-ready evidence for the scheme.

Lessons Learned & Best Practice

  • Early survey and thermal imaging help target the most efficient energy-saving measures.
  • Combining boiler replacement with insulation upgrades maximizes energy efficiency and cost savings.
  • Effective communication with homeowners ensures smooth project delivery and resident satisfaction.

Conclusion

  • Achieve measurable energy and carbon savings.
  • Improve resident comfort and wellbeing.
  • Comply fully with regulatory, PAS 2030/2035, and ECO4 requirements.
  • Deliver social value through local employment and training

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