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Boilers & Heating

Boiler replacement, controls and zoned heating upgrades.

The boiler is the heart of the heating system. Replacing an aged or inefficient boiler with a modern condensing combi or system unit cuts bills, improves reliability and unlocks zoned controls, smart thermostats and underfloor heating integration.

Common Damage

1. No Heating or Hot Water

  • Failed pump, diverter valve or PCB
  • Low system pressure or air locks
  • Pilot or ignition faults on older units

2. Inefficiency

  • Older non-condensing boilers waste energy
  • Higher bills than necessary for the property size
  • Frequent cycling on and off

3. Leaks & Corrosion

  • Drips around the boiler casing
  • Sludge in radiators reducing output
  • Internal corrosion shortening lifespan

Repairs

minor Repairs

  • Re-pressurise system and bleed radiators
  • Replace thermostats and timers
  • Service annually for safety and efficiency

moderate Repairs

  • Replace failed pumps, valves or expansion vessels
  • Power-flush system to remove sludge
  • Add magnetic system filter

major Repairs

  • Full boiler replacement (combi, system or regular)
  • Upgrade to smart zoned heating controls
  • Integrate underfloor heating with new manifolds

New Installation

When Replacement Is Needed

  • Boiler is over 12–15 years old
  • Repair costs approach replacement cost
  • Renovating to add bathrooms or extensions

Installation Steps

  1. Survey & Sizing

    • Calculate heat load and hot water demand
    • Choose combi, system or regular boiler
  2. Remove Old Unit

    • Drain system safely
    • Decommission old gas and water connections
  3. Install New Boiler

    • Mount, flue and connect to gas, water and condensate
    • Fit filter and inhibitor
  4. System Flush

    • Power-flush radiators and pipework
    • Dose with corrosion inhibitor
  5. Commission & Certify

    • Test gas pressure and combustion
    • Issue Gas Safe and Benchmark certificates

Lifespan

Modern condensing boiler
12–15 years
Smart thermostat
10+ years
Radiators (steel panel)
20–25 years
Hot water cylinder
15–25 years

Warning Signs

  • Boiler over 12 years old and unreliable
  • Yellow rather than blue burner flame
  • Cold spots at the bottom of radiators
  • Frequent re-pressurising required
  • Rising gas bills with no change in usage

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