#TeamOfPeople

Full Heating System Conversion & Vaillant Boiler Installation in Middlesex

Project Summary

Location: Middlesex

Client: Private Residential Property

Services Provided: Heating system conversion, boiler installation, gas safety certification

Key Works: Full system strip-out, Vaillant Ecofit Pure 825 installation (10-year warranty), power flushing, controls upgrade

Project Type: Reactive failure → full system upgrade

Contact Us
Image link

Project Overview

Plumb London attended the property following ongoing heating system issues affecting reliability and performance. The existing setup included a hot water cylinder, cold water storage tank, and feed and expansion tank operating as an open-vented system.

Rather than continuing with isolated repairs, the system was fully converted to a sealed combi configuration to remove multiple failure points and stabilise long-term performance.

Retaining the existing system would have resulted in continued inefficiency, repeated maintenance issues, and increased risk of leaks from ageing stored water components.

Scope of Works

  • Full system drain down and isolation
  • Decommissioning and removal of:
    • Existing boiler
    • Hot water cylinder
    • Cold water storage tank
    • Feed and expansion tank
  • Installation of Vaillant Ecofit Pure 825 combi boiler (10-year warranty)
  • Installation of:
    • Inline scale reducer
    • Boiler protection kit
    • CO alarm
    • T3R wireless room thermostat
    • 7 x TRVs and lockshield valves
  • Installation of Type 11 radiator (750×1000) – bathroom
  • Full system power flush using chemical treatment and mechanical agitation
  • Installation of new fill and flush valve
  • System refill, commissioning, and testing
  • Chemical dosing with inhibitor
  • Completion of Domestic Gas Safety Certificate
Contact Us

Key Work Completed

The original system relied on multiple ageing components, each representing a potential failure point. Open-vented systems of this type are prone to air ingress, sludge accumulation, and inconsistent pressure control.

Plumb London carried out a full system strip-out, removing the cylinder and associated tanks. These components are common sources of leaks and structural damage when they fail.

The system was converted to a sealed combi configuration using a Vaillant Ecofit Pure 825, providing stable pressure and on-demand hot water while eliminating reliance on stored water.

Before commissioning, the system underwent a full power flush using chemical agents and vibration methods. Without this process, residual sludge would circulate into the new boiler, increasing the risk of heat exchanger blockage, reduced efficiency, and premature failure.

Additional protection was introduced through an inline scale reducer and boiler protection kit, addressing both limescale and debris—two key contributors to long-term boiler degradation.

Heating control was improved through installation of a T3R wireless thermostat and TRVs, allowing better temperature regulation and reducing unnecessary energy usage.

The system was fully tested, commissioned, and dosed with inhibitor to protect internal components. A Domestic Gas Safety Certificate was issued on completion.

This was not a like-for-like replacement—it was a full system conversion removing multiple failure points and resetting system performance.

Environment / Operational Considerations

Works were carried out within an occupied residential property, requiring full system shutdown and controlled sequencing of removal, installation, and commissioning.

Additional Works and Building Protection

System cleansing and inhibitor dosing protect the new installation from:

  • Sludge contamination
  • Circulation issues
  • Premature component wear

Removal of stored water tanks also reduces risk of future leaks affecting the property.

Programme

Works were completed in July 2024 within a controlled installation window, with system shutdown, conversion, and commissioning sequenced to minimise downtime.

Project Value

Full system upgrade (mid-to-high value installation)

Represents a complete removal of legacy system risk and installation of a modern, protected heating solution.

Client testimonial available on request.

Location

Delivered in Middlesex, covering surrounding areas including Pinner, Harrow, and Ruislip.

Contact Us

Need a Plumber? Call - 020 7871 1861

Plumb London can help fix your plumbing problems from fixing leaks to replacing boilers.

Gallery

2989 Happy Customer Reviews

Customer Testimonials

We are rated 4.8 of 5 stars

Don’t just take our word for it, here’s a selection of the latest reviews. You can view more here.

Contact Plumb London

If you are facing a plumbing, heating, boiler or drainage issue in London, do not hesitate to get in touch with Plumb London. Our friendly and knowledgeable team is ready to assist you with all your plumbing needs. Reach out to us today to schedule a consultation and experience the difference with Plumb London.

Contact Us
call-plumb-london-today