Boiler Replacement and Power Flush – Clear Pricing Guide
A boiler replacement and power flush is essential when installing a new boiler onto an existing heating system. Flushing removes sludge, debris, and contamination that can reduce efficiency, cause breakdowns, and invalidate manufacturer warranties.
Below is a transparent breakdown of labour costs, system preparation, and optional upgrades, helping homeowners and landlords in Surrey and London understand exactly what is included.
Boiler Replacement and System Power Flush Pricing
Standard Installation Labour Package
This package covers the professional installation work required when replacing a boiler on an existing system.
Included:
- Boiler replacement labour ( BOILER NOT INCLUDED)
- Full power flush of heating system (up to 7 radiators)
- Chemical inhibitor added after flushing
Price:
£870
Additional radiators: £40 per radiator
Important Notice
The boiler and flue are not included in the above price.
These are quoted separately based on property layout, boiler choice, and flue requirements.
Additional Requirements (If Not Already Installed)
Some components are legally required or strongly recommended when installing a new boiler.
Magnetic System Filter
Required by current installation standards.
Supply & fit: £140
Programmable Room Thermostat
Required with all new boiler installations.
Honeywell T3R Wireless Programmable Thermostat
Supply & fit: £145
Limescale Protector
Required in hard water areas to protect the boiler heat exchanger.
Supply & fit: £60
Condensate Pipe Upgrade
Upgrade from 21.5mm to 32mm for external runs.
Supply & fit: £80
Condensate pump and installation not included if required.
Carbon Monoxide (CO) Alarm
Kidde CO alarm – supply & fit: £20
Thermostatic Radiator Valves (TRVs)
Supply & fit: £45 per radiator
Boiler Disposal (Optional)
£40
Flue Installation Notice
This quotation includes:
- Standard horizontal flue only
Not included:
- Vertical flue installations
- Flue extensions
Flue pricing varies depending on:
- Flue type
- Length
- Installation complexity
A site assessment may be required.
A professionally installed horizontal boiler flue exiting through an external wall. The flue installation complies with current Building Regulations and manufacturer guidelines, ensuring safe removal of combustion gases from the property.
What’s Included with Every Installation
All boiler replacement and power flush installations include:
- 1-year installation warranty
- An extended manufacturer’s warranty is available on selected boilers
- Benchmark commissioning certificate completed
- Gas Safety Certificate CP12
- Building Regulations compliance notification
- Assistance in choosing the correct boiler size
- Full system commissioning and testing
Why Choose Certificates4UK Ltd
Certificates4UK Ltd provides boiler installation for Surrey homeowners and landlords who trust it for transparent pricing and professional workmanship.
- Over 180+ positive reviews across Google, Trustpilot, and Facebook
- Trusted local engineers covering Surrey and London
- Experience in installing and commissioning modern boilers with full compliance
This quotation structure ensures clarity, compliance, and long-term system reliability when replacing a boiler and carrying out a power flush heating system clean.
Contact Certificates4UK Ltd
Need a reliable Gas Safe engineer for boiler repairs, safety checks, or certification? We’re here to help.
We cover:
Molesey • Walton • Woking • Cobham• Weybridge • Sunbury-on-Thames • Surrey • London
Before replacing any parts or booking costly work, let one of our qualified engineers carry out a professional inspection to save you time and money.
Booking Options:
- 🌐 Book Online – Simple, quick, and available 24/7
- 📞 Call: 07596 076700 or 07869 520044
- 📧 Email: info@certificates4uk.co.uk
📍 Proudly serving Molesey, Surrey, and London, we specialise in:
Boiler repairs, Gas Safety Certificates (CP12), Installation, plumbing, EICR testing, EPC inspections, and full property compliance.
⭐ With over 14 years of experience and 150+ five-star reviews, Certificates4UK Ltd is the trusted choice for safe, professional, and cost-effective heating services.
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