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Transforming Tenant Comfort: Upgrading to a Navien NCB 500 on Connaught Road, Roath, Cardiff - Central Heating Cardiff, Swansea & South Wales

Transforming Tenant Comfort: Upgrading to a Navien NCB 500 on Connaught Road, Roath, Cardiff

Upgrade your boiler for enhanced efficiency, lower maintenance costs, and improved tenant comfort. Discover the benefits of modern boilers in our Connaught Road, Roath, Cardiff case study.
Phil Collier July 8, 2024

Case Study: Upgrading from an Old Vaillant Boiler to a New Navien NCB 500 - A Heating Engineer's Perspective

As a heating engineer, I was recently tasked with upgrading an outdated Vaillant boiler to a new Navien NCB 500 in a rental property located on Connaught Road, Roath, Cardiff CF24 3PU. This case study details my approach to the project, the reasons for the upgrade, and the benefits it brought to both the landlord and the tenants.


The landlord, managing multiple properties, faced increasing complaints from tenants about the reliability and efficiency of the old Vaillant boiler. Recognising the need for a more dependable and efficient heating solution, he decided to replace the ageing system with a modern Navien NCB 500 boiler after I highlighted the advantages of this upgrade from a technical and practical standpoint..My role was to ensure a smooth transition from the old boiler to the new one.

Assessing the Need for an Upgrade

During my initial assessment, several factors indicated the necessity for a boiler replacement:

1. Frequent Breakdowns: The old Vaillant boiler had a history of frequent breakdowns, leading to tenant dissatisfaction and high repair costs.

2. Inefficiency: The ageing boiler was not performing efficiently, resulting in higher energy consumption and increased utility bills.

3. Technological Advancements: The Navien NCB 500 offered advanced features and better efficiency, making it a suitable replacement.

New Boiler Installation Process

The installation of the Navien NCB 500 involved several critical steps:

1. Assessment: I conducted a thorough assessment of the existing heating system to ensure compatibility with the new boiler and to plan for any necessary modifications.

2. Removal of Old Boiler: The old Vaillant boiler was carefully disconnected and removed. I ensured that all obsolete components were disposed of responsibly.

3. Installation of Navien NCB 500: The new boiler was installed with precision, ensuring all connections and settings were configured for optimal performance.

4. System Testing: I rigorously tested the entire heating system to verify proper operation and made adjustments as needed to ensure everything was functioning correctly.

5. Tenant Education: I provided the tenants with information on how to use the new boiler, including instructions on the smart controls and tips for maximising energy efficiency.

Benefits for the Landlord

From my professional perspective, the upgrade to the Navien NCB 500 offered several significant benefits for the landlord:

1. Reduced Maintenance Costs: The new boiler required less frequent maintenance and had fewer breakdowns, translating to lower long-term costs.

2. Increased Property Value: Installing a modern, efficient boiler increased the property's overall value, making it more attractive to potential tenants and buyers.

3. Energy Savings: The high efficiency of the Navien NCB 500 reduced energy consumption, resulting in significant savings on utility bills when the property is unoccupied.

4. Enhanced Tenant Satisfaction: A reliable and efficient heating system improved tenant comfort and satisfaction, leading to longer tenancies and reduced turnover rates.

5. Compliance with Regulations: The upgrade ensured compliance with current energy efficiency regulations, avoiding potential fines and legal issues.

Benefits for the Tenants

The tenants also reaped numerous benefits from the new boiler installation:

1. Improved Heating Performance: The Navien NCB 500 provided consistent and efficient heating, ensuring a comfortable living environment.

2. Lower Energy Bills: The boiler’s high efficiency translated to lower energy bills, making the property more affordable.

3. Reliability: With fewer breakdowns and disruptions, tenants enjoyed uninterrupted heating and hot water.

4. Advanced Features: The smart controls and connectivity options of the Navien NCB 500 allowed tenants to easily manage their heating settings for optimal comfort.

5. Environmental Benefits: Living in a property with a high-efficiency boiler contributed to a lower carbon footprint, aligning with tenants' preferences for sustainable living.

Addressing Potential Challenges

During the installation process, I encountered and addressed a few potential challenges:

- Compatibility Issues: Ensuring that the new boiler was compatible with the existing system required careful planning and minor adjustments.

- Educating Tenants: Providing clear instructions and guidance to tenants on using the new system was crucial for ensuring they could take full advantage of its features.


From a heating engineer's perspective, the decision to upgrade from an old Vaillant boiler to a new Navien NCB 500 at the property on Connaught Road, Roath, Cardiff CF24 3PU proved to be highly beneficial for both the landlord and the tenants. The new boiler's reliability, efficiency, and advanced features significantly improved the property's heating system. This case study highlights the importance of investing in modern, energy-efficient technology to enhance tenant satisfaction and reduce operational costs. The successful completion of this project underscores the value of a systematic and professional approach to heating system upgrades.

Eric Collier & Son

Head Office in Cardiff

Engineering Teams throughout South & West Wales

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