Local Gas Safe boiler installation across South East London and nearby KentNeed help? 0203 633 3558
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Boiler installation prices in South East London

Compare indicative prices for 10 combi boilers from five established manufacturers. Every figure covers a standard like-for-like installation and is checked against your property before it becomes a fixed quotation.

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Current online guide

Indicative installed prices from £2,395 inc. VAT

Prices were reviewed on 28 August 2026. All displayed prices are inc. VAT and assume the new combi boiler stays in the same position with a standard horizontal flue. Moving the boiler, converting the system, using a roof flue, arranging scaffolding or correcting major sludge problems costs extra.

Baxi 430 Combi 2.1 combi boiler

Baxi · BAXI 01

Baxi 430 Combi 2.1

30kW · A-rated

A sensible budget-first replacement.

  • 5-year manufacturer cover
  • Gas Safe standard installation
  • Filter, chemical clean and controls

Indicative installed price£2,659inc. VAT

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Baxi 630 Combi 2 combi boiler

Baxi · BAXI 02

Baxi 630 Combi 2

30kW · A-rated

More protection without a premium price.

  • 7-year manufacturer cover
  • Gas Safe standard installation
  • Filter, chemical clean and controls

Indicative installed price£2,915inc. VAT

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Viessmann Vitodens 025-W combi boiler

Viessmann · VIESSMANN 01

Viessmann Vitodens 025-W

28kW · A-rated

Compact engineering at an entry price.

  • Up to 5-year manufacturer cover
  • Gas Safe standard installation
  • Filter, chemical clean and controls

Indicative installed price£2,395inc. VAT

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Viessmann Vitodens 050-W combi boiler

Viessmann · VIESSMANN 02

Viessmann Vitodens 050-W

30kW · A-rated

Long cover and built-in connectivity.

  • Up to 10-year manufacturer cover
  • Gas Safe standard installation
  • Filter, chemical clean and controls

Indicative installed price£2,876inc. VAT

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Worcester Greenstar 1000 combi boiler

Worcester Bosch · WORCESTER 01

Worcester Greenstar 1000

30kW · A-rated

A recognised name at a lower entry point.

  • 5-year manufacturer cover
  • Gas Safe standard installation
  • Filter, chemical clean and controls

Indicative installed price£2,551inc. VAT

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Popular choice
Worcester Greenstar 4000 combi boiler

Worcester Bosch · WORCESTER 02

Worcester Greenstar 4000

30kW · A-rated

A polished premium model with broad support.

  • Up to 10-year manufacturer cover
  • Gas Safe standard installation
  • Filter, chemical clean and controls

Indicative installed price£3,331inc. VAT

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Ideal Logic+ Combi2 C30 combi boiler

Ideal · IDEAL 01

Ideal Logic+ Combi2 C30

30kW · A-rated

A dependable mid-market option.

  • 7-year manufacturer cover
  • Gas Safe standard installation
  • Filter, chemical clean and controls

Indicative installed price£3,147inc. VAT

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Ideal Logic MAX Combi2 C30 combi boiler

Ideal · IDEAL 02

Ideal Logic MAX Combi2 C30

30kW · A-rated

More cover for long-term peace of mind.

  • 10-year manufacturer cover
  • Gas Safe standard installation
  • Filter, chemical clean and controls

Indicative installed price£3,274inc. VAT

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Vaillant ecoFIT pure 830 combi boiler

Vaillant · VAILLANT 01

Vaillant ecoFIT pure 830

30kW · A-rated

Premium name at the lower Vaillant price.

  • Up to 10-year manufacturer cover
  • Gas Safe standard installation
  • Filter, chemical clean and controls

Indicative installed price£3,178inc. VAT

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Vaillant ecoTEC plus 832 combi boiler

Vaillant · VAILLANT 02

Vaillant ecoTEC plus 832

32kW · A-rated

Higher output with premium controls.

  • Up to 10-year manufacturer cover
  • Gas Safe standard installation
  • Filter, chemical clean and controls

Indicative installed price£3,636inc. VAT

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Included in the standard price

What the installation covers

  • Removal and responsible disposal of the old boiler
  • New boiler, standard flue and magnetic system filter
  • Gas Safe installation, testing and commissioning
  • Chemical clean, inhibitor and suitable controls
  • Carbon monoxide alarm, registration and handover

When the price needs reviewing

The standard figure is not suitable where the boiler moves, the flue exits through a roof, scaffolding is required, the property changes from a regular or system boiler to a combi, or major remedial pipework is needed.

Those points are checked before work is agreed. You receive the final scope and price in writing.

Check the likely fit

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The estimator uses your bedrooms, bathrooms, current boiler, flue position and timeframe to guide the next step.

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