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Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing).
Published: May 13, 2021. Updated: February 15, 2024


If you are looking for the answer to a question you have relating to boilers or Boilerhut, there’s a good chance that you will find it here. On this page, we have included the most frequently asked questions we are asked by customers. However, if you have a question that you can’t find the answer to here, use the button below to contact us.

Boilerhut is a boiler installation company, offering gas, oil and LPG boiler installations all across the UK. 

Founded in 2013, we are proud to be Viessmann Trained Installers, part of the Grant G1 scheme, Ariston recommended installers and approved Navien Certified Installers. However, as an independent boiler installation company, we are able to install combi, regular and system boilers from any manufacturer in the UK.

Discover more about us.

Yes, Boilerhut is Gas Safe registered. Our business registration number is 575250. This means that we are legally allowed to carry out the following gas work:

Domestic Natural Gas  LPG
Building Regulations Yes Yes
Caravans (touring, static and park homes) Yes
Combustion performance gas analysis Yes Yes
Domestic Cookers/hobs Yes Yes
Gas Fire Yes Yes
Gas Boiler Yes Yes
Gas Meters Yes Yes
Gas installation pipework Yes Yes
Domestic flued range cookers Yes Yes
Vented hot water storage cylinders Yes Yes
Gas Water heaters Yes Yes

You can check our business on the Gas Safe Register

Boilerhut works by providing you with a quote for a heating system that meets your specific needs. To do this all we need is for you to tell us about your property, provide your contact details, and our sophisticated system will do the rest by providing you with a tailored quote via email. Get a free online quote.

In regard to fuel source, we install gas, oil, and LPG boilers. In regard to boiler type, we install combi boilers, regular boilers, and system boilers. When it comes to boiler manufacturers, we are approved by Viessmann, Ariston, Navien and Grant to install their boilers. However, as we are independent of any manufacturer, we can install boilers from any manufacturer in the UK.

Yes. If you’re a landlord, we can either deal with yourself directly, your letting agent, or the tenant. Simply request an online boiler quote in the usual way and we will be in touch to discuss your installation further.

The time it takes to fit a boiler depends on the existing boiler type, the new boiler type, and the boiler installation location. Typically, the following timeframes apply:

Combi boiler to combi boiler swap

This is the replacement of an existing combi boiler with a new combi boiler. With this installation, the new boiler will usually be installed into the same location as the existing boiler and will utilise the existing pipework. 

However, this type of installation can take longer if we need to install new pipework, or if your gas run needs to be upgraded to comply with current building regulations. 

Even if this boiler installation requires additional pipework or gas run upgrades, we still anticipate that the installation of a combi boiler will only take one working day.

Average installation time: 1 working day

Relocation of a combi boiler 

This is the installation of a replacement combi boiler in a new location. Examples of this include moving the combi boiler to the airing cupboard, garage, or basement. However, a combi boiler can be installed in many different locations throughout your home. 

Relocation of a combi boiler will involve our heating engineer capping off your current gas pipework and running additional pipework to the new location. 

Essentially, the further the new location your new boiler is from your existing boiler, the longer the installation will take. 

Average installation time: Up to 2 working days

System upgrade installation 

This is the installation of a boiler that is a different type from the boiler that you currently have. An example of this could be replacing a back boiler with a combi boiler, replacing a system boiler with a combi boiler, or replacing a combi boiler with a system boiler.

If we are replacing your system boiler with a combi boiler, this will involve our engineer taking away your existing hot water cylinder as the combi boiler doesn’t require one, and repiping your central heating system.

If your system upgrade involves our engineer replacing a combi boiler with a system boiler, additional time will be required for the installation of a hot water cylinder and new pipework.

Average installation time: Between 2.5 working days to 3.5 working days

We can have your new boiler installed in as little as 24 hours.

At Boilerhut, we have embraced modern technology and done away with the need for time-consuming home surveys. Advances in technology mean that we can review everything relating to your heating system remotely, in exactly the same way we could do if we were attending your property in person.

We conduct our surveys using a number of different methods including by asking you comprehensive questions, asking you to provide pictures of your current heating system, and using video call technology.

Boiler warranty periods differ from manufacturer to manufacturer. The warranty length can also depend on who installs your boiler. If your boiler is installed by a manufacturer-approved engineer, you will typically be eligible to receive a longer warranty period. To give you an idea of the warranty that you are likely to receive, we have included the following table of the maximum warranty periods available from bestselling boiler manufacturers in the UK.

Boiler Manufacturer Warranty Period
Viessmann Up to 12 years
Worcester Bosch Up to 12 years
Ideal Heating Up to 12 years
Ariston Up to 12 years
Vaillant Up to 10 years
Baxi Up to 10 years
Vokera Up to 10 years
Alpha Up to 10 years
Glow-worm Up to 7 years
Keston Up to 7 years
Potterton Up to 7 years
Heatline Up to 7 years
Main Up to 5 years
Ferroli Up to 5 years

At Boilerhut, we predominantly install boilers from Viessmann, Ariston, Navien and Grant. The warranty periods for these boilers are provided by the individual manufacturer and can be seen below:

Viessmann: Up to 12 years warranty
Ariston: Up to 12 years warranty
Navien: Up to 10 years warranty
Grant: Up to 10 years warranty

All of the boilers and additional components that we install come with comprehensive warranties that cover the cost of parts and labour in the event of product failure. Terms and conditions relating to the warranty apply.

All of the manufacturers we deal with request that the boiler is registered with them within 30 days of installation, which we will do on your behalf. To keep your warranty valid, your boiler must be annually by the manufacturer or another competent heating engineer.

Each manufacturer has its own specific terms and conditions for keeping the warranty valid, however, we are able to advise you of these prior to installation.

Yes, unless you request otherwise, we will be happy to take away your old boiler and dispose of it for you. If we identify that your boiler contains asbestos, this will require specialist removal. This is not an issue though and we can arrange this for you, however, it will incur additional costs.

Yes, this is not an issue. So long as there is sufficient space around the boiler for installation and servicing, and it’s a suitable location, we will be happy to relocate your boiler. We will discuss the costs for doing this at the time of providing you with a detailed quote.

No, back boilers can no longer be installed due to being inefficient and in some cases, dangerous. Back boilers haven’t been installed since the 1980s. If you have an older back boiler such as a Baxi Bermuda, we recommend that you replace this with a combi boiler instead.

Yes, we offer a range of finance payment options to spread the cost of boiler supply and installation. Head to our Boiler Finance page to find out more about the finance options we are able to offer.

A combi boiler is a space-saving type of boiler that has all of the water heating and central heating components housed in one unit. With a combi boiler, there is no need for a separate hot water cylinder. Find out more about combi boilers.

Also known as a conventional boiler or a heat only boiler, regular boilers are the most traditional type of boiler installed into UK properties. A regular boiler is a type of boiler that comprises several components, these include the boiler unit, a hot water cylinder and a cold water storage tank. Find out more about regular boilers.

A system boiler is the middle ground between a combi boiler and a regular boiler. System boilers comprise the boiler unit and an unvented hot water cylinder. However, they don’t require an exterior pump or a header tank. System boilers are the most common boiler solution for households with high hot water demands. Find out more about system boilers.

A boiler flue is a pipe connected to the boiler that emits exhaust gases and hot air from the boiler’s combustion chamber to the exterior of a property. Boiler flues typically come in two options – horizontal or vertical. A horizontal flue exits the property from an exterior wall, whilst a vertical flue exits a property through the roof. 

If your boiler installation requires a vertical flue, the flue will need to be installed with a cover to stop rain, snow or any falling debris from entering it. 

Boiler flues are also subject to several regulations relating to where they can be installed, the minimum distances are as follows:

  • A horizontal boiler flue cannot be situated within 300mm of an opening window, door, or an air vent 
  • A horizontal boiler flue must be situated at least 2.1m above ground level if facing a pathway
  • A horizontal boiler flue must be situated at least 75mm below guttering, drainpipes or soil pipes
  • A horizontal boiler flue must be situated at least 300mm above ground, roof or balcony level
  • A vertical boiler flue must be installed at least 300mm above a flat roof or the roof pitch

Out of the widely available boilers in the UK, the following utilise stainless steel heat exchangers:

  • Viessmann (utilised across the entire boiler range)
  • Navien (utilised across the entire boiler range)
  • Ariston (utilised across the entire boiler range)
  • Vaillant ecoTEC exclusive with Green iQ combi
  • Vaillant ecoTEC plus combi
  • Vaillant ecoTEC plus combination store
  • Vaillant ecoTEC pro combi
  • Vaillant ecoTEC exclusive with Green iQ system
  • Vaillant ecoTEC plus system
  • Ideal Vogue Max Combi
  • Ideal Vogue Max System
  • Ideal Vogue Gen2 System
  • Ideal Mexico HE
  • Baxi 600 Combi
  • Baxi 800 Combi
  • Baxi 600 Heat
  • Baxi 800 Heat
  • Baxi 600 System
  • Baxi 600 System LPG
  • Baxi 800 System
  • Baxi Platinum+ System
  • Baxi Megaflo System Boiler
  • Baxi 600 Combi LPG
  • Baxi Duo-tec Combi
  • Alpha (utilised across the entire boiler range)

A condensate pipe is a pipe utilised on condensing boilers to transfer the acidic wastewater produced from the boiler’s condensing process safely into an external drain. To find out more, read our article – What is a Condensate Pipe?

There are various reasons for a leaking boiler, some of the possible reasons include:

  • Corrosion
  • Damaged heat exchanger
  • Poorly installed paperwork
  • Pressure release valve issues
  • Condensate pipe issues
  • Boiler pressure too high
  • Broken seals on internal parts

Should you require further information about this, our article “Why is my boiler leaking water?” answers this question in detail.

A condensing boiler is a higher efficiency boiler that condenses and recycles water vapour through a primary heat exchanger to recover the latent heat that otherwise would be wasted.

Since 1st April 2007, it has been a legal requirement that all gas and oil boilers installed in England and Wales must be condensing boilers. Whilst in Scotland, this has been the law since 1st April 2005 for oil boilers and 1st April 2007 for gas boilers.

No, low boiler pressure isn’t dangerous and doesn’t necessarily mean there is anything wrong with your boiler. It is usually a result of a water leak or radiator bleed. You can find out more about low boiler pressure in the following article – Boiler Pressure Too Low – What It Means And How To Respond.

A combi boiler takes water directly from the mains and provides hot water almost instantly to radiators, taps, and showers. It does this by igniting the gas burner and using two heat exchangers to transfer the heat to the water. A combi boiler’s primary heat exchanger is used for central heating and the secondary heat exchanger is used for hot water.

We explain how a combi boiler works further in our article – How Does a Combi Boiler Work?

Thermostatic radiator valves, commonly known as TRVs, are controls that allow you to adjust and turn off the heating for each individual radiator that they are fitted to.
TRVs are designed to increase your boiler’s energy efficiency, provide you with more control over your heating system, whilst also saving you money on your energy bills.

To test your water flow rate:

  • Find an unrestricted mains supply such as an outside garden tap
  • Get a 5-litre bucket and time how long it takes to fill up

If it fills up in 15 seconds, you’ve got a 20L/minute flow rate. This is a suitable flow rate for system and combi boilers.

Viessmann can be contacted by calling 01952 675060

Worcester Bosch can be contacted by calling 0330 123 9559

You can contact Ideal Heating by calling 01482 498660

You can contact Ariston by calling them on 0333 2408777

You can contact Vaillant by calling them on 0345 6022922

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