How we're operating during the COVID-19 pandemic

Find out more How we’re operating during COVID-19
  • Get the best quotes, fast!
  • Over 5,000 engineers across the UK
  • Gas Safe registered engineers

Need a new boiler?

Get FREE no-obligation quotes now!

  • No delays! Get quotes today
  • Compare quotes & get the best prices
  • Gas Safe & OFTEC registered engineers
 4.8 stars

1,240 reviews

Excellent 4.8 out of 5

Warmflow Boilers: Compare Efficiency, Warranty & Price


With 50 years’ experience, Warmflow manufactures market-leading heating products at the company’s headquarters in Lisburn. The company attributes its success and longevity to 3 key priorities: ‘Quality manufacturing, quality sales support and quality back up service.’

Warmflow is the brand that brought the UK and Ireland’s first and only AA rated combi oil boiler to market, and now they have gone even further thanks to a market leading patented design that sees the combi boiler moving from AA rated to AAA rated status. This makes them the ideal choice for oil boiler owners who want to keep carbon emissions and heating bills to a minimum.

The brand has also introduced their new Professional boiler range which is designed to save the installer and homeowner time and money as it comes with over £250 of time-saving components already fitted.

Warmflow manufacture a range of oil-fired combi, regular and system boilers in a variety of output ratings – something it’s essential to get right when looking for a replacement boiler – which can be installed either inside or outside the home.

  • Output rating: The size of the boiler relates to the output rating. Measured in kilowatts (kW), the output rating reflects the power of the unit and helps to give an idea of the level of demand for heating and hot water the unit will be able to meet.
  • Efficiency: For a boiler to reduce your heating bills as much as possible, the boiler needs to be using the fuel effectively. Some boilers are able to convert more fuel into usable energy than others and this is shown as the efficiency rating.
  • Warranty: A warranty will see that you’re covered should a fault arise after the installation of your new boiler. All boilers come with a warranty of at least 1 year. The Agentis range from Warmflow comes with a 5 year warranty as standard.

Our Boiler Comparison Tool allows you to compare the key specifications of up to 4 different boilers. Simply hit the ‘add boiler’ symbol to include a boiler as part of your comparison and don’t forget to include your existing boiler.

Compare Warmflow combi boiler prices

Combi boilers are cost-effective units that don’t need to be installed alongside a cylinder or tank. This makes them great space-saving heating systems that are able to meet the hot water demands of homes with 1-2 bathrooms.

Boiler Model kW Efficiency Warranty Typical Price

Best Sellers

Warmflow Agentis Internal Combi 26kW Oil Boiler 26 kw Aaa 5 years £2,270 VIEW
Warmflow Agentis Internal Combi 33kW Oil Boiler 33 kw Aaa 5 years £2,470 VIEW
Warmflow Agentis External Combi 33kW Oil Boiler 33 kw Aa 5 years £2,710 VIEW

Available

Warmflow Agentis Internal Combi 21kW Oil Boiler 21 kw Aaa 5 years £2,170 VIEW
Warmflow Agentis External Combi 21kW Oil Boiler 21 kw Aa 5 years £2,300 VIEW
Warmflow Agentis External Combi 26kW Oil Boiler 26 kw Aa 5 years £2,500 VIEW
Warmflow Agentis Pro Internal Combi 21kW Oil Boiler 21 kw Aa 5 years £2,500 VIEW
Warmflow Agentis Pro Internal Combi 26kW Oil Boiler 26 kw Aa 5 years £2,630 VIEW
Warmflow Agentis Pro Internal Combi 33kW Oil Boiler 33 kw Aa 5 years £2,830 VIEW
Warmflow Agentis Pro External Combi 21kW Oil Boiler 21 kw Aa 5 years £2,650 VIEW
Warmflow Agentis Pro External Combi 26kW Oil Boiler 26 kw Aa 5 years £2,710 VIEW
Warmflow Agentis Pro External Combi 33kW Oil Boiler 33 kw Aa 5 years £2,900 VIEW
Warmflow Kabin-Pak Combi KC70HEE 21kW Oil Boiler 21kw 89.1% 2 years £1,995 VIEW
Warmflow Kabin Pak Combi KC90HEE 26kW Oil Boiler 26kw 89.5% 2 years £1,975 VIEW
Warmflow Kabin Pak KC120HEE Combi 33kW Oil Boiler 33kw 89.1% 2 years £2,200 VIEW
Warmflow Utility UC70HEE Combi 21kW Oil Boiler 21kw 89.1% 5 years £1,345 VIEW
Warmflow Utility Combi UC90HEE 26kW Oil Boiler 26kw 89.1% 5 years £1,400 VIEW
Warmflow Utility UC120HEE Combi 33kW Oil Boiler 33kw 89.1% 5 years £1,990 VIEW

Review costs of Warmflow system oil boilers

Warmflow oil system boilers need to be installed alongside a hot water cylinder, allowing them to meet the higher hot water demands of homes with multiple bathrooms. A system boiler with a central heating output of 28-34 kW can meet the demands of a home with up to 20 radiators.

Boiler Model kW Efficiency Warranty Typical Price

Best Sellers

Warmflow Agentis Internal System 33kW Oil Boiler 33 kw A heat 5 years £1,730 VIEW

Available

Warmflow Agentis Internal System 21kW Oil Boiler 21 kw A heat 5 years £1,500 VIEW
Warmflow Agentis Internal System 26kW Oil Boiler 26 kw A heat 5 years £N/A VIEW
Warmflow Agentis External System 21kW Oil Boiler 21 kw A heat 5 years £1,740 VIEW
Warmflow Agentis External System 26kW Oil Boiler 26 kw A heat 5 years £1,800 VIEW
Warmflow Agentis External System 33kW Oil Boiler 33 kw A heat 5 years £2,000 VIEW
Warmflow Agentis Pro Internal System 21kW Oil Boiler 21 kw A heat 5 years £1,820 VIEW
Warmflow Agentis Pro Internal System 26kW Oil Boiler 26 kw A heat 5 years £1,890 VIEW
Warmflow Agentis Pro Internal System 26kW Oil Boiler 33 kw A heat 5 years £1,950 VIEW
Warmflow Agentis Pro External System 21kW Oil Boiler 21 kw A heat 5 years £1,800 VIEW
Warmflow Agentis Pro External System 26kW Oil Boiler 26 kw A heat 5 years £2,110 VIEW
Warmflow Agentis Pro External System 33kW Oil Boiler 33 kw A heat 5 years £2,500 VIEW
Warmflow Kabin Pak KS70HE System 21kW Oil Boiler 21kw 90.7% 2 years £1,417 VIEW
Warmflow Kabin Pak KS90HE System 26kW Oil boiler 26kw 90.8% 2 years £1,650 VIEW
Warmflow Kabin Pak KS120HE System 33kW Oil boiler 33kw 90.7% 2 years £1,650 VIEW
Warmflow Utility US70HE System 21kW Oil Boilers 21kw 90.7% 5 years £1,175 VIEW
Warmflow Utility US90HE System 26kW Oil boiler 26kw 90.8% 5 years £1,585 VIEW
Warmflow Utility US120HE System 33kW Oil boilers 33kw 90.7% 5 years £1,510 VIEW

Costs of Warmflow regular oil boilers

Regular, or heat-only, boilers are the most traditional type of heating system that need to be installed alongside a cold water feed tank, expansion vessel and hot water cylinder. Warmflow regular oil boilers are highly efficient.

Boiler Model kW Efficiency Warranty Typical Price

Available

Warmflow Agentis Internal Heat Only 21kW Oil Boiler 21 kw A heat 5 years £1,300 VIEW
Warmflow Agentis Internal Heat Only 26kW Oil Boiler 26 kw A heat 5 years £1,360 VIEW
Warmflow Agentis Internal Heat Only 33kW Oil Boiler 33 kw A heat 5 years £1,560 VIEW
Warmflow Agentis Internal Heat Only 44kW Oil Boiler 44 kw A heat 5 years £1,700 VIEW
Warmflow Agentis Internal Pumped 21kW Oil Boiler 21 kw A heat 5 years £1,440 VIEW
Warmflow Agentis Internal Pumped 26kW Oil Boiler 26 kw A heat 5 years £1,440 VIEW
Warmflow Agentis Internal Pumped 33kW Oil Boiler 33 kw A heat 5 years £1,530 VIEW
Warmflow Agentis Internal Pumped 44kW Oil Boiler 44 kw A heat 5 years £1,900 VIEW
Warmflow Agentis External Heat Only 21kW Oil Boiler 21 kw A heat 5 years £1,560 VIEW
Warmflow Agentis External Heat Only 26kW Oil Boiler 26 kw A heat 5 years £1,590 VIEW
Warmflow Agentis External Heat Only 33kW Oil Boiler 33 kw A heat 5 years £1,920 VIEW
Warmflow Agentis External Heat Only 44kW Oil Boiler 44 kw A heat 5 years £2,100 VIEW
Warmflow Agentis External Pumped 21kW Oil Boiler 21 kw A heat 5 years £1,680 VIEW
Warmflow Agentis External Pumped 26kW Oil Boiler 26 kw A heat 5 years £1,740 VIEW
Warmflow Agentis External Pumped 33kW Oil Boiler 33 kw A heat 5 years £2,110 VIEW
Warmflow Agentis External Pumped 44kW Oil Boiler 44 kw A heat 5 years £2,500 VIEW
Warmflow Agentis Boilerhouse 21kW Oil Boiler 21 kw A heat 5 years £1,170 VIEW
Warmflow Agentis Boilerhouse 26kW Oil Boiler 26 kw A heat 5 years £1,170 VIEW
Warmflow Agentis Boilerhouse 33kW Oil Boiler 33 kw A heat 5 years £1,370 VIEW
Warmflow Agentis Pro Internal Pumped 21kW Oil Boiler 21 kw A heat 5 years £1,760 VIEW
Warmflow Agentis Pro Internal Pumped 26kW Oil Boiler 26 kw A heat 5 years £1,850 VIEW
Warmflow Agentis Pro Internal Pumped 33kW Oil Boiler 33 kw A heat 5 years £1,950 VIEW
Warmflow Agentis Pro Internal Pumped 44kW Oil Boiler 44 kw A heat 5 years £2,060 VIEW
Warmflow Agentis Pro External Pumped 21kW Oil Boiler 21 kw A heat 5 years £1,990 VIEW
Warmflow Agentis Pro External Pumped 26kW Oil Boiler 26 kw A heat 5 years £2,150 VIEW
Warmflow Agentis Pro External Pumped 33kW Oil Boiler 33 kw A heat 5 years £2,400 VIEW
Warmflow Agentis Pro External Pumped 44kW Oil Boiler 44 kw A heat 5 years £2,600 VIEW
Warmflow Boilerhouse B70HE 21kW Regular Oil Boiler 21kw 90.7% 7 years £1,045 VIEW
Warmflow Boilerhouse B90HE 26kW Regular Oil Boiler 26kw 90.7% 7 years £1,780 VIEW
Warmflow Boilerhouse B120HE 33kW Regular Oil Boiler 33kw 90.8% 7 years £1,225 VIEW
Warmflow Kabin-Pak K70HE 21kW Regular Oil Boiler 21kw 90.7% 7 years £1,310 VIEW
Warmflow Kabin-Pak K90HE 26kW Regular Oil Boiler 26kw 90.8% 7 years £1,345 VIEW
Warmflow Kabin-Pak K120HE 33kW Regular Oil Boiler 33kw 90.7% 7 years £1,635 VIEW
Warmflow Kabin-Pak K150HE 44kW Regular Oil Boiler 44kw 90.3% 7 years £1,915 VIEW
Warmflow Utility HE U70HE 21kW Regular Oil Boiler 21kw 90.7% 7 years £1,175 VIEW
Warmflow Utility HE U90HE 26kW Regular Oil Boiler 26kw 90.8% 7 years £1,230 VIEW
Warmflow Utility HE U120HE 33kW Regular Oil Boiler 33kw 90.7% 7 years £1,300 VIEW
Warmflow Utility HE U150HE 44kW Regular Oil Boiler 44kw 90.3% 7 years £1,795 VIEW

If you’re looking for a new oil boiler or a heating system run on renewable energy, Warmflow are an excellent choice. To get free quotes for a Warmflow heating system tailored to your home send us simple enquiry today. There’s no-obligation to use any of the quotes but you could potentially make a considerable saving by comparing.

Get FREE Boiler Quotes

Get Free Quotes

1. Tell us about your job

2. Get quotes to compare

3. Choose the best

 


Warmflow combi oil boilers

Combi boilers are the ideal choice for small to medium sized homes as they produce hot water on demand from one compact unit.

Warmflow combi boilers are AAA rated for efficiency making them the most efficient oil combi boilers in the UK and Northern Ireland. The success of the new AA rated combi oil boiler has been unprecedented as installers and householders search for products which offer tangible benefits both in terms of efficiency and cost saving with the Warmflow combi oil boiler up to 5ltrs of fuel per week more efficient than other market leading combi oil brands.

Benefits of an Agentis Internal Combi boiler

  • Compact sizes make combi boilers perfect for smaller properties
  • Ideal where there is little or no loft space
  • No need for a hot water cylinder allows increased living space
  • No cold water storage tank frees up a loft for conversion
  • No risk of loft pipework freezing
  • Less pipework in the home makes installation typically cheaper.
  • Front servicing
  • AA Rating on M & XL load profile
  • Riello low NOx technology
  • Factory fitted Grundfos UPM3 FLEX AS circulating pump
  • Frost thermostat on external model
  • 24l Factory-fitted, hinged, expansion vessel
  • Low component count
  • DHW expansion vessel
  • DCW inlet shut-off valve
  • Factory-fitted DCW pressure reducing valve
  • Push-in O-ring fittings
  • Slimline design
  • Integrated 7-day programmer
  • Patented design

The new combi oil boiler is now one of the slimmest on the market at only 515mm wide which will ensure it fits into the tightest of kitchen and utility room spaces. Featuring a 24ltr, hinged expansion vessel for ease of servicing, other features include a reduced component count, O ring push fit connections, a domestic hot water mini expansion vessel, pressure reducing & pressure relief valve have been factory fitted as standard. The additional components added will save an installation engineer around £150 and 2 hours labour in time saved fitting the components.

Send us an enquiry and we will put you in touch with three of the best quality installers in your area for a no obligation quote. Get quotes for a new Warmflow boiler.

Warmflow System Oil Boilers & Prices

As with all system boilers, this model has no need of a bulky cold water tank in the loft – however it does make use of a hot water cylinder which is the key difference between a combi and a system boiler.

Benefits of an Agentis Internal System boiler

  • Riello low NOx technology
  • Factory-fitted Grundfos UPM3 FLEX AS circulating pump
  • 12l Expansion vessel
  • Frost thermostat on external models
  • Factory-fitted automatic air vent
  • Factory-fitted 3-bar safety valve

You’ll need to contact more than one to get quotes for installation too so that you can be sure you’re getting the best deal from your new heating system Get quotes for a new Warmflow boiler.

Warmflow regular oil boilers

The Warmflow Heat Only (regular) oil boilers are ideally suited for homes that already have a traditional heating and hot water system including a separate hot water cylinder which is often kept in an airing cupboard. These boilers also need a cold water storage tank in the loft to feed the hot water cylinder as well as an expansion tank to maintain the water level of the central heating system.

Benefits of an Agentis Internal Heat Only boiler

  • Warmflow’s unique, patented 5mm stainless steel heat exchanger technology
  • Latest Riello low NOx burner
  • Stylish white casing suitable for all indoor installations
  • Outputs ranging from 15-44kW
  • Quiet operation
  • Extended warranty for Warmflow Connect installers
  • Benefits of an Agentis Internal Pumped boiler

    The Agentis Internal Heat Only pumped features all the power and efficiency of the heat only range as well as a factory fitted Grundfos UPM3 FLEX AS circulating pump to reduce installation time and maximise space within the system. It is available in outputs from 15kW to 44kW.

    Benefits of an Agentis Boilerhouse boiler

    The Warmflow boiler house model is designed for boiler house and garage installations and is also suitable for indoor installation. The boiler uses the same unique patented stainless steel heat exchanger found in the internal and external models alongside the latest Riello Low NOx burner technology, the Agentis boiler house model offers excellent fuel efficiency and straightforward, quick installation.

  • Patented high-efficiency heat exchanger
  • Single socket operation
  • Only 1 IE320 mains socket (supplied) needs to be wired on site
  • Latest Riello low NOx technology exceeding legislative requirements
  • Range of outputs from 15 – 33kW.
  • You’ll need to contact more than one to get quotes for installation too so that you can be sure you’re getting the best deal from your new heating system Get quotes for a new Warmflow boiler.

    Warmflow regular oil boilers

    The Warmflow Regular oil boilers are ideally suited for homes that already have a traditional heating and hot water system including a separate hot water cylinder which is often kept in an airing cupboard.

    These boilers also need a cold water storage tank in the loft to feed the hot water cylinder as well as an expansion tank to maintains the water level of the central heating system.

    The compact size and smart design of Greenstar regular boilers means that they will look great in any home, with several options readily fitting into a standard kitchen cupboard.

    Warmflow boilers for outdoor installation

    Agentis internal boilers (combi, system, and regular) are also available as external models which are suitable for outside installation. These boilers are fully insulated and protected from the elements with a green finish to help it blend in with its surroundings.

    Warmflow Professional Agentis boilers

    Warmflow has launche their new Professional boiler range which is designed to save the installer time and money as it comes pre-fitted with a number of time-saving components such as an Adey Magnaclean Pro 2 filter, a Grundfos circulating pump as well as other installation kits that contain all the extras an installer needs to complete a successful installation as well as a 5 years parts and labour warranty.

    Most Warmflow Agentis boilers are available as ‘Professional’ models. The Agentis Internal and External Heat Only Pumped, System, and Combi boilers include £250 of factory-fitted elements including to streamline installation:

  • Teddington fire valve with 9m capillary
  • Oil line installation kit with a Crossland oil filter
  • ADEY Magnaclean pro 2 filter
  • Pre Wired Grundfos UPM3 Flex AS Circulating Pump
  • Includes 2 Bottles of Inhibitor.
  • Brian Beattie of Warmflow said: “When we set out to develop this new boiler the focus was on ease of installation,” added Oliver. “We listened to feedback from our customers and reacted with the important new additions that will make life so much easier for them.”

    Warmflow oil boiler prices will vary depending on which brand you choose and the type and size of boiler you need. The cost of installing it will also vary as each installer will provide a slightly different quote.

    The best way to ensure you get the most competitive price is to compare multiple quotes; that way you can be sure you’re getting the best deal from your new heating system and a range of professional advice to consider. Get quotes for a new Warmflow boiler.

    Get FREE Boiler Quotes

    Get Free Quotes

    1. Tell us about your job

    2. Get quotes to compare

    3. Choose the best

     


    Warmflow Boiler Service

    It’s important to keep your boiler in the best possible condition with an annual boiler service by a professional engineer. This will ensure the boiler can operate as efficiently as possible, keeping heating bills to a minimum, and that there are no potential safety issues to be concerned about. A boiler service is also a great way to catch and fix small repairs before they have the chance to worsen over time and cause an expensive breakdown. Find out what’s involved in an annual boiler service, why it’s so important, the benefits and how much they cost in Warmflow Boiler Service.

    Warmflow Boiler Warranty

    Every boiler manufacturer offers a standard warranty with their boilers which last between 1-10 years. The warranty is your insurance policy and means if a fault develops the manufacturer will resolve it within a specified time frame. Some warranties include both parts and labour while others may only cover parts. The most important thing to remember is to get your boiler serviced by a qualified engineer every year as failing to do so is likely to invalidate your warranty. For more detail about this brand’s warranty (including the small print) take a look at Warmflow Boiler Warranty.

    Warmflow Boiler Repair Advice

    Even the highest quality boiler can develop faults and problems as they age. Some are minor issues you may be able to handle yourself but most will need an OFTEC registered engineer to diagnose and repair the problem. To find out if there are any common problems associated with this manufacturer you can read our guide to Warmflow Boiler Repairs & Common Warmflow Boiler Problems.


    Need a one-off boiler repair?

     

    Get an emergency boiler repair quote now.

     


    Warmflow Error Codes

    Error codes may appear on your boiler’s display; it’s your boiler’s way of telling you that something is wrong. Each manufacturer uses a different coding system to help an engineer to diagnose a fault. In some cases it may be a simple issue such as low pressure which you can adjust yourself but more technical faults will certainly need a professional. We’ve put together a list of error codes for all Warmflow Boilers to help you understand what’s wrong before you contact an engineer.

    Warmflow Renewable Heating Solutions

    Warmflow also manufacture renewable heating solutions for off grid homes looking to reduce their carbon footprint including an air source heat pump, ground source heat pump which extracts latent heat from the ground and a biomass boiler which burns wood pellets to heat water for your home.

    Need a new boiler?

    Get FREE no-obligation quotes now!

    Excellent 4.8 out of 5
    Excellent 4.8 out of 5

    Find approved boiler engineers
    in your area.

    Begin your search by entering your postcode below.

    Or select your region from the list and start your search