Boiler Warranties & Guarantees | A Guide to Good Value

Quick Guide Summary

Is the boiler warranty important? What is the difference between a warranty & guarantee?

All new boilers come with a warranty, or sometimes a guarantee, from the boiler manufacturer. This means that if you experience a genuine fault with the boiler during the 'warranty period', the manufacturer will repair the boiler free of charge. The warranty period will vary from 2 years to 10 years. The length of the warranty period has a big impact on your long term maintenance costs; particularly as the likelihood of faults occurring increases as the boiler gets older. We review warranties from 9 mainstream manufacturers, including Worcester and Ideal, to see who offers long term value. If you need more detail on who offers the best all round boiler package, then try our Guide to Buying the Best Boiler.

Overview of Boiler Warranties and Guarantees

What is the difference between a warranty and guarantee

A guarantee improves your consumer rights

Who offers great boiler cover?

 10 years of cover available from Ideal, Vaillant, Baxi, Worcester and Viessmann. Guarantees available from Worcester, Vaillant and Glow Worm

Who offers the best boiler package?

Read our Guide to Buying the Best Boiler to find out who offers the best warranty for the best price.

Read our top tips to securing your extended boiler warranty

We explain boiler registration, annual servicing and other requirements

How to use this Guide

Which is best - Warranty or Guarantee

Warranties by manufacturer

Meeting the conditions of cover

What is the difference between a Guarantee and a Warranty?

The boiler guarantee is a contract between you, the homeowner, and the boiler manufacturer to attend your property and repair or replace the boiler within a reasonable period of time without quibble. The guarantee is legally binding on the manufacturer and improves your consumer rights. Worcester Bosch were the first to upgrade their warranty to a guarantee, followed by Vaillant and Glow Worm.

All other boiler manufacturers offer a warranty on their products. A boiler warranty is like an insurance policy. The boiler manufacturer promises to come and have a look at the problem, but it is not a no-quibble policy to fix or replace it. Warranties entitle manufacturers to charge for call outs and the terms of a warranty can be changed without notice.

Boiler Warranties and Guarantees by Manufacturer

At the very least, a boiler will come with a 2 year warranty from the manufacturer, however most boiler manufacturers with extend their boiler cover up to 5 years. Worcester Bosch, Baxi, Vaillant, Ideal and Viessmann now offer 10 year warranties or 10 year guarantees on their premium boiler models.

A number of manufacturers offer the same model of boiler, sometimes with a different name, with differing lengths of warranty, and the price will vary accordingly. In short, you can pay extra for the same boiler for a longer period of cover from the manufacturer.

Conditions of Cover

All of the manufacturers have strict conditions that must be met in order to secure their extended warranty or guarantee. The tables below set out the warranty or guarantee details for the boilers from our 9 manufacturers.

We set out the conditions that must be adhered to in order to 1) secure their standard cover period and 2) secure the extended cover period should one be provided. We have also looked at what happens in the event of a breakdown, i.e. what is covered, any charges that the manufacturer may apply and exclusions of service (such as no safe access). At the end of the nine tables we have summarised common exclusions of cover.

Baxi Warranty

Baxi's mandatory conditions are standard and they give a generous 60 days either side of the installation anniversary to get the boiler serviced. However you may be asked to pay a deposit before an engineer attends which will not be refunded if it transpires to be a non-boiler related fault. Baxi provide a boiler warranty.

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Baxi Warranty Details

Baxi Boilers

Standard Cover

Free Extended Cover

Warranty or Guarantee

Mandatory conditions of basic warranty

Conditions of extended warranty (beyond 1 year)

In the event of a breakdown

Baxi 200

3

3

Warranty

Installer is Gas Safe Registered

Registered within 30 days by installer or homeowner

Maybe asked to pay a deposit before an engineer attends

Baxi 400

3

5

Warranty

Benchmark form completed at time of installation

Serviced annually (60 days before or after anniversary of installation)

Deposit will not be refunded if engineer cannot gain access or conditions of warranty are not met

Baxi/Duotec

7

7

Warranty

Installed in line with installation instructions

Proof of service on site if not done via Baxi Customer Support

Repair won't be carried out if access is not safe

Baxi/Eco Blue + Compact

7

7

Warranty

 

Maintained in line with maintenance instructions

 

Baxi Ecoblue Advance

10

10

Warranty

     

Baxi Platinum

10

10

Warranty

     

Ideal Warranty

Standard conditions for minimum warranty apply. A stricter servicing policy than Baxi, i.e. that the boiler must be serviced every 12 months. Again a potential call out fee for non boiler related faults but also if documentation is not complete and available on site. Ideal provide a boiler warranty.

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Ideal Warranty Details

Ideal Boilers

Standard Cover

Free Extended Cover

Warranty or Guarantee

Mandatory conditions of basic warranty

Conditions of extended warranty (beyond 1 year)

In the event of a breakdown

Ideal Independent

5

5

Warranty

Installed and commissioned within 12 months of manufacture

Registered within 30 days by installer or homeowner

Reserve the right to charge a call out fee where no benchmark sheet is present, no fault found, cannot gain access, conditions not met

Ideal / Logic+ Combi

7

7

Warranty

Installer is Gas Safe Registered

Serviced at the end of every 12 month period

 

Ideal/Vogue

10

10

Warranty

Benchmark form completed at time of installation

Maintained in line with maintenance instructions

Repair won't be carried out if access is not safe

     

Warranty

Installed in line with installation instructions

   

Potterton Warranty

Potterton's mandatory conditions are standard and like Baxi they give a generous 60 days either side of the installation anniversary to get the boiler serviced. However you may be asked to pay a deposit before an engineer attends which will not be refunded if it transpires to be a non-boiler related fault. Potterton offer a warranty.

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Potterton Warranty Details

Potterton Boilers

Standard Cover

Free Extended Cover

Warranty or Guarantee

Mandatory conditions of basic warranty

Conditions of extended warranty (beyond 1 year)

In the event of a breakdown

Potterton
Gold

2

2

Warranty

Installer is gas safe registered

Registered within 30 days by installer or homeowner

Deposit will not be refunded if engineer cannot gain access or conditions of warranty are not met

Potterton
Titanium

7

7

Warranty

Installed in line with installation instructions

Serviced annually (60 days before or after anniversary of installation)

 

Potterton
Promax

2

2

Warranty

Benchmark form completed at time of installation

Proof of service on site if not done via Baxi customer support

Repair won't be carried out if access is not safe

     

Warranty

Maintained in line with maintenance instructions

   

Vaillant Guarantee

Standard conditions for minimum warranty apply. The boiler must be fitted by a Vaillant Advanced Installer in order to secure the extended warranty. Same charging policy but only for non-boiler related faults. Vaillant offer a Guarantee over a Warranty but it does not extend to other Vaillant products fitted at the same time as the boiler.

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Vaillant Guarantee Details

Vaillant Boilers

Standard Cover

Free Extended Cover

Warranty or Guarantee

Mandatory conditions of basic warranty

Conditions of extended guarantee

In the event of a breakdown

Vaillant
EcoFITpure

2

7-10

Guarantee

Benchmark form completed at time of installation

Fitted by Vaillant Advance Installer

A refundable deposit may be required

Vaillant
EcoTEC pro

2

5-10

Guarantee

Registered within 30 days by installer or homeowner (on a discretionary basis may accept late registrations)

 

Charges will apply for installation, non boiler and external system faults, which may also invalidate the guarantee

Vaillant
EcoTEC plus

5

7-10

Guarantee

Serviced annually at least 15 months after installation and within 15 months of its last service - details must be recorded in the benchmark book

   

Vaillant
EcoTEC Green iQ

5

7-10

Guarantee

     

Worcester Bosch Guarantee

Standard conditions for minimum warranty apply. The boiler must be fitted by a Worcester Accredited Installer in order to secure the extended warranty. Same charging policy for non-boiler related faults and standard conditions not being met, including documentation not on site. Worcester offer a Guarantee over a Warranty. Worcester will extend the terms of the Guarantee to other qualifying products if fitted at the same time as the new boiler, such as the WAVE, Comfort controls and Greenstar Filter.

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Worcester Bosch Guarantee Details

Worcester Boilers

Standard Cover

Free Extended Cover

Warranty or Guarantee

Mandatory conditions of basic warranty

Conditions of extended guarantee

In the event of a breakdown

Worcester Bosch / Greenstar Professional

5

7

Guarantee

Correctly installed and commissioned in accordance with installation instructions

Annual service

Maybe asked to pay a deposit before an engineer attends

Worcester Greenstar Compact

7

9

Guarantee

Registered within 30 days of installation

Installed by a Worcester Accredited Installer

Deposit will not be refunded if engineer cannot gain access or conditions of warranty are not met

Worcester Greenstar Classic

7

10

Guarantee

Must be used for domestic or light commercial purposes

 

Repair won't be carried out if access is not safe

Baxi/Eco Blue + Compact

7

10

Guarantee

     

Worcester Greenstar Compact

7

10

Guarantee

     

Worcester Greenstar Classic

7

10

Guarantee

     

Main Boilers Warranty

Main's mandatory conditions are standard and they give a generous 60 days either side of the installation anniversary to get the boiler serviced. However you may be asked to pay a deposit before an engineer attends which will not be refunded if it transpires to be a non-boiler related fault. Main provide a warranty.

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Main Boilers Warranty Details

Main Boilers

Standard Cover

Free Extended Cover

Warranty or Guarantee

Mandatory conditions of basic 1 year warranty

Conditions of extended warranty (beyond 1 year)

In the event of a breakdown

Main Eco Elite

5

5

Warranty

Installer is Gas Safe Registered

Registered within 30 days by installer or homeowner

Maybe asked to pay a deposit before an engineer attends

     

Benchmark form completed at time of installation

Serviced annually (60 days before or after anniversary of installation)

Deposit will not be refunded if engineer cannot gain access or conditions of warranty are not met

 
     

Warranty

Installed in line with installation instructions

Proof of service on site if not done via Baxi Customer Support

Repair won't be carried out if access is not safe

     

Warranty

 

Maintained in line with maintenance instructions

 

Viessmann Warranty

Standard conditions for minimum warranty apply. The boiler must be fitted by a Viessmann trained ins in order to secure the extended warranty. Same charging policy for non-boiler related faults. Viessmann provide a warranty.

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Veissmann Warranty Details

Viessman Boilers

Standard Cover

Free Extended Cover

Warranty or Guarantee

Mandatory conditions of basic warranty

Conditions of extended warranty

In the event of a breakdown

Viessmann
Vitodens 050

3

3

Warranty

Installer is Gas Safe Registered

Annual service and within one year of the installation date

May be charged a call out fee if fault not on the boiler

Viessmann
Vitodens 100

5

10

Warranty

Benchmark form completed at time of installation

Installed by a Viessmann Trained Installer

 

Viessmann
Vitodens 200

3

5

Warranty

 

Registered within 30 days by installer or homeowner

 

Glow Worm Guarantee

Standard conditions for minimum warranty apply. The boiler must be fitted by a Club Energy Installer in order to secure the extended warranty. Same charging policy but only for non-boiler related faults. Glow Worm offer a Guarantee over a Warranty.

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Glow Worm Guarantee Details

Glow Worm Boilers

Standard Cover

Free Extended Cover

Warranty or Guarantee

Mandatory conditions of basic warranty

Conditions of extended warranty (beyond 1 year)

In the event of a breakdown

Glow Worm
Easicom

3

4

Guarantee

Benchmark form completed at time of installation

When fitted by a Club Energy installer

A refundable deposit may be required

Glow Worm
Energy

2

2

Guarantee

Registered within 30 days by installer or homeowner (on a discretionary basis may accept late registrations)

Registered with Club Energy

Charges will apply for installation, non boiler and external system faults, which may also invalidate the guarantee

Glow Worm
Ultimate 3

5

5

Guarantee

Serviced annually at least 15 months after installation and within 15 months of its last service - details must be recorded in the benchmark book

   

Glow Worm
Essential

3

3

Guarantee

     

Ferroli Boiler Warranty

Standard conditions for minimum warranty apply. By far the most lengthy set of terms and conditions and very specific about exclusions. Same charging policy but only for non-boiler related faults. Ferroli offer a warranty.

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Ferroli Warranty Details

Ferroli Boilers

Standard Cover

Free Extended Cover

Warranty or Guarantee

Mandatory conditions of basic warranty

Conditions of extended warranty (beyond 1 year)

In the event of a breakdown

Ferroli / Modena

5

5

Warranty

Installed by a Gas Safe registered engineer

Annual service every 12 months and record left on site

Repaired on site, occasionally to repair at Ferroli offices - customer to bare the charge of transportation

     

Warranty

Proof of purchase if no benchmark form available

 

A pre authorised deposit refundable on the basis that the engineer can gain access, there is a genuine manufacturering fault and the correct documentation is present

     

Warranty

Registered with Ferroli within 30 days of installation

   

Top Tips for Securing Your Free Extended Boiler Cover

  1. ​Ensure the Benchmark form is completed and on site (located in the back of the user manual)
  2. Ensure there is safe access to the boiler - e.g. fixed loft ladder and light if situated in the loft
  3. Register the boiler within 30 days of installation or check your installer has done it
  4. For extended warranties you may have to use an Accredited Installer.
  5. Have the boiler serviced annually and keep the documentation on site
  6. Be sure the fault is a genuine manufacturing issue by ringing the manufacturer's help line - you will be charged for a call out if not.
  7. To avoid additional charges, make sure you are home when the engineer attends and the Benchmark and servicing documentation is on site and completed.

Only Worcester Bosch, Vaillant and Glow Worm currently offer a Guarantee

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