Installing a new boiler is a big investment that can impact your home's comfort, energy efficiency, and long-term savings. Whether you live in Bromley, Croydon, or the surrounding areas, making the right choices before installation is crucial.
At South London Heating, we specialise in professional boiler installation across Bromley and Croydon, helping homeowners make informed decisions. Before installing a boiler, several essential factors must be considered. To guide you, we've compiled a detailed checklist covering everything you need to know about the boiler installation process.
Still unsure about how to install a boiler? South London Heating is here to help! Call 0203 620 5800 or email hello@southlondonheating.co.uk to schedule a consultation.
Reliable, professional, and energy-efficient heating solutions—South London Heating keeps your home warm with expert care.
The Checklist To Consider Before Installing A Boiler
1. Choosing The Right Boiler Type
Selecting the right boiler is the foundation of an efficient heating system installation. The three main types are:
- Combi boiler installation – Ideal for small homes or flats with one bathroom. It heats water on demand, eliminating the need for a storage tank.
- System boilers – Great for larger homes with multiple bathrooms. They store hot water in a cylinder, ensuring a consistent supply.
- Regular boilers – Best for homes with high water demand and traditional radiator systems requiring a separate tank and cylinder.
Tip: Assess your home’s size and water usage before choosing a boiler setup.
2. Checking Boiler Efficiency Ratings
Opting for an energy-efficient boiler (A-rated, 90%+ efficiency) reduces energy consumption and lowers utility bills. Modern condensing boilers recover heat that would otherwise be lost, making them eco-friendly and cost-effective.
3. Selecting The Right Boiler Size (Output Capacity)
Boilers are measured in kilowatts (kW). Choosing the right size prevents inefficiency:
- Small homes/flats with 1 bathroom - 24-30kW combination boiler.
- Large homes with high hot water demand and more than 15 radiators - 40+kW regular boiler with separate hot water cylinder
- Medium sized homes with 2-3 bathrooms - 30kW-40kW combination boiler or 18kW-35kW system boiler with a separate hot water cylinder.
Tip: An oversized boiler wastes energy, while an undersized one won’t meet your heating needs. Consulting a boiler expert ensures the right selection.
4. Checking If Your Heating System Needs An Upgrade
- Installing smart heating controls (e.g., Nest or Hive) can optimise energy usage.
- Consider power flushing to remove sludge and debris before installation.
5. Choosing A Reliable Boiler Brand
Top manufacturers known for quality and warranty coverage include:
- Worcester Bosch – Up to 12-year guarantees.
- Vaillant – Renowned for energy-efficient and eco-friendly models.
- Ideal Boilers – Budget-friendly with strong performance.
6. Understanding Boiler Installation Cost And Budgeting
Typically, a new boiler installation ranges between £2,000 to £5,500. However, there are several factors affect the boiler installation cost:
- Type and brand of the boiler.
- Additional work required (pipe upgrades, etc.).
- Labour charges for a professional boiler installation.
Tip: Many providers offer interest-free finance options to spread costs affordably.
7. Checking Your Home’s Water Pressure
Combi boilers depend on mains water pressure. If pressure is low, you may need:
- A system or regular boiler instead.
- A booster pump to enhance water flow.
8. Ensuring Proper Ventilation And Flue Placement
- Boilers require adequate ventilation for safe operation.
- The flue (exhaust pipe) must be placed correctly to expel waste gases safely.
Regulations mandate that boiler flues be at least 30cm from windows, doors, or air vents.
9. Complying With Building Regulations And Safety Standards
- A Gas Safe registered engineer must handle every gas boiler installation.
- Your new boiler must comply with Part L of UK Building Regulations (energy efficiency requirements).
- Landlords must provide Gas Safety Certificates for rented properties.
Tip: Always verify Gas Safe credentials before hiring a boiler installer.
10. Considering Long-Term Maintenance And Warranty
- Regular servicing ensures boiler longevity and safety.
- Many brands offer 5-12-year warranties, valid only with annual servicing.
Join a maintenance plan for servicing, repairs, and breakdown cover.
Connect With South London Heating For Professional Boiler Installation
At South London Heating, we specialise in boiler installation in Bromley, Croydon, and surrounding areas. When you choose us, you’ll get:
- 25+ years of experience – Trusted boiler installation service providers in Bromley.
Gas Safe registered engineers – Fully qualified professionals. - Accredited installers – We work with Worcester Bosch, Vaillant, and Ideal Boilers.
- Flexible finance options – Interest-free credit and low monthly payment plans.
- Award-winning service – Rated “Excellent” on Trustpilot, Checkatrade, and Which? Trusted Trader.
CONTACT SOUTH LONDON HEATING
How Do We Install A Boiler?
Our boiler installation process ensures a quick, efficient, and hassle-free experience:
1. Free Home Survey And Consultation
Our expert engineers assess your property, discuss your needs, and recommend the best boiler setup.
2. Transparent Quote And Fixed Pricing
We provide a fixed-price quote with no hidden costs.
3. Professional Boiler Installation By Gas Safe Engineers
Our team safely removes your old boiler and installs the new one with minimal disruption.
4. System Testing And Safety Checks
Comprehensive performance and safety tests guarantee efficiency.
5. Aftercare And Support
You’ll receive a Gas Safe certificate and guidance on using your new system. We offer ongoing maintenance plans to keep your boiler in top condition.
Are you finally ready for a new boiler installation? Call us on 0203 620 5800 or email hello@southlondonheating.co.uk. You can also WhatsApp us on +44 7880 527 500 for a new boiler quote.
FAQs
How do I know if I need a new boiler?
If your boiler is over 10-15 years old, frequently breaks down, or is inefficient, it may be time for a replacement. A new energy-efficient boiler can reduce heating costs and improve performance.
How long does a boiler installation take?
A standard gas boiler installation usually takes 1-2 days, depending on its complexity. However, additional work, such as pipework upgrades or radiator replacements, is required.
Do I need a Gas Safe engineer to install my boiler?
Yes! The UK law requires a Gas Safe registered engineer to carry out all gas boiler installations to ensure safety and compliance with building regulations.
Do new boilers come with warranties?
Yes! Most brands offer warranties from 5 to 12 years, provided you have annual servicing by an accredited installer.
Can I install a boiler myself?
No. Only a boiler expert with Gas Safe certification can legally install a heating system installation in the UK. DIY installation is unsafe and illegal.
