External Oil Boiler, Wall hung external oil boiler,Outdoor oil boiler,External oil boilers

External Oil Boilers – Wall Hung – 15kW to 28kW Output

External Oil Boilers – The need for more space within our homes is a typically modern demand. The reduction in the size of current housing units has made it necessary to develop new solutions for installing the appliances in unused areas, such as external walls or balconies.External oil boilers / outdoor oil boilers satisfy this need, guaranteeing the same level of comfort, safety and reliability as a traditional indoor oil boiler. Designed to be installed outside the inhabited areas, in places protected from direct rain, they are made of particularly resistant materials capable of External Oil Boilers ,Wall Hung external oil boilers,outside oil boiler,external oil boilers priceswithstanding the wear and tear of humidity, frost and other adverse weather conditions. The protection against bad weather is completed by special windproof devices, which ensure the correct functioning of the boiler in normal weather conditions throughout the year. The frost protection systems acting on both the heating and the DHW side ensure normal appliance operation up to external temperatures of – 10 ° C, preserving the boiler and also the room where the heating system is installed.If the outdoor temperature drops with the risk of freezing, the circulation pump is activated and, if necessary, the burner.The outdoor boilers can be easily managed from inside the house thanks to the advanced remote-control thermo regulation systems


The advantages of external oil boilers

• More space inside your home. Eliminating the boiler from your utility room or kitchen maximizes essential space and when it comes to old, large boilers, removes an obvious eyesore
• Reduced noise – Some boilers are significantly noisy when in operation. With vibrating, banging and humming sounds a constant irritation
• No carbon monoxide gas danger.- Although not a typical or common event, carbon monoxide leakages are a genuine risk which can be removed by installing the boiler externally
• Prevents potential damage to your home – Sometimes, boilers can leak oil which not only causes significant damage and mess but can also smell.
• Much easier to gain access to for servicing and maintenance- Moving the boiler outdoors means your home does not become momentary workshop during annual servicing and can enhance access to making your routine upkeep and the engineer’s task much easier
• Heating for outside buildings- If you decide to install the boiler in an outhouse or garage, it will lose a particular quantity of heat to the air around it which could be a favourable result if the location is utilized as a work area or storage

External Oil Boiler Features

  • Condensing heat exchanger , with a Manufacturer’s 5 Year Guarantee
  • Outputs ranging from 15–28kW / 51,180 to 95,536 Btu’s
  • Manufacturer’s 2 Year Guarantee on Parts/Labour, and an additional 3 years for the Heat Exchanger ( making 5 years in total for the heat exchanger ).That’s how confident in the quality of our product we are.This is subject to correct installation, commissioning and servicing as per our manufactures’ instructions – of course with the exception of service items)
  • Exceptionally quiet operation
  • High quality external powder coated case
  • Ecoflam MAX1 Burner- which is a Low NOx version class 3 with yellow flame oil burner
  • External wall mountable
  • SEDBUK – Rated “A” External Oil Boiler – The highest efficiency available at present
  • Efficiency: SAP 2009/2012 annual efficiency (89.8% to 90.2%)
  • British Made

External oil Boilers  – SEDBUK stands for ‘Seasonal Efficiency Data Base United Kingdom’. It is a government scheme introduced to encourage and ensure that the efficiency of heating appliances can be rated fairly across all manufacturers . The grades are A,B,C,D, or E with grade A representing the highest efficiency available at present.

External Oil Boilers Models and Options

All of our external oil boilers, which also get referred to as outdoor or outside oil boilers , are available in 3 different types, these being –

  1. External – Standard Oil Boiler ( or sometimes referred to as Conventional or even Regular oil boilers ) – These are oil external boilers that don’t have an inbuilt pump or expansion vessel , that is required for a sealed system. These standard oil boilers are normally found in older heating systems, where the you have an oil boiler, linked to a hot water storage calorifiers ( more commonly known as a hot water tank ) fed by a cold water storage tank ( normally located in the loft ) and usually installed on what is called an open vent heating system , which was the prevalent or traditional way of installing heating systems up until 15 years or so ago. If you are looking to replace your old oil boiler, with one of our external condensing oil boilers, in an older existing heating system, then this is probably the replacement oil boiler for you. These condensing oil boilers are a lot more efficient with a minimum efficiency of 90% , but if commissioned correctly you are looking at an efficiency of more like 93% , meaning that for very litre of oil burnt, around 93% of it’s useful heat is utilized, reducing your fuel bills accordingly
  2. External – System Oil Boiler – A system boiler is basically an standard boiler, which includes the pump and expansion tank that are built into the external condensing oil boiler which allows you to have a “sealed heating system”, which has become the standard over the last 15 years or so. The benefits of a ” sealed system” are that no feed and expansion tank is required in the loft or at high level ( another benefit is that these tanks were prone to freezing or bursting at the most inconvenient time , often cause major water damage or resulting in a failed heating system ), and that the oil heating installation is made a lot more tidier, easier, and simplifies servicing of the external oil boiler, as everything is in one place , withing the boiler casing.
  3. External Combination or “Combi” Oil Boiler – A “Combi” or Combination Oil Boiler are the most popular installed oil domestic boilers these days in the UK, as the provide both heat for the central heating system and Domestic Hot Water ( sometimes referred to as DHW) , for washing and bathing with a household.This makes the external oil boilers extremely efficient as they only heat the domestic hot water when a shower or hot water tap is turned on, thus ensuring maximum efficiency. They eliminate the need for a domestic hot water cylinder or tank and the space required by it, not to mention the expense and also eliminate the need for a feed and expansion tank in the loft space. These Combi Oil Boilers, are a complete package , or complete external oil boiler system , in one unit, being simple to use, easy to install and economical to run, with plenty of domestic hot water , for you to enjoy a bath or shower.The Flow rate of these boilers is 12 to 14 Litres a minute, with a 50 Degrees C temperature uplift or rise.


We do 2 models within our our range of External Oil Boilers – a 15 kW to 22kW Output model , or in BTU’s = 51,180 to 75,064 , this external oil boiler would normally be suitable for smaller semi detached or terraced properties and bungalows alike , but should you be in any doubt of what size boiler you require , please consult a heating engineer or plumber, for further advice.

                                          External Oil Boiler  15kW to 22kW Output
    Standard   System   Combi
Height   990mm   990mm   990mm
Width   582mm   582mm   582mm
Depth   400mm   400mm   400mm
Weight KG (dry)   109kg   120kg   126kg

The large external oil boiler model is a 23kW to 28kW Output model , or in BTU’s = 78,476 to 95,536 , this external oil boiler would normally be suitable for Larger semi detached or terraced properties and larger bungalows alike , but again should you be in any doubt of what size boiler you require , please consult a heating engineer or plumber, for further advice.

                                          External Oil Boiler  23kW to 28kW Output
    Standard   System   Combi
Height   990mm   990mm   990mm
Width   582mm   662mm   662mm
Depth   400mm   400mm   400mm
Weight KG (dry)   120kg   131kg   137kg

Which ever option you require, we highly recommend that you use an OFTEC approved / trained installer who promotes excellence in the oil heating industry by setting standards for  installation and maintenance of oil-fired appliances for the domestic consumer

Flue Terminating Positions for Oil Fired External Oil Boilers

Flue Terminating Positions for Oil Fired External Oil Boilers,Outdoor oil boiler,Outside oil boiler,External oil boilers prices

Advantages of External oil Boilers 

External condensing oil boilers have full load efficiencies of up to 93%. That’s up to 20% more efficient than an existing traditional oil boiler and potentially a 20% reduction in your fuel bills!

They say a picture can speak a thousand words , and below you can see one of our external oil boilers , installed at high level , the ability to install our external oil boilers in a wall hung configuration , means that you place them in a variety of locations off the floor , which is a particular advantage for customers who live in  a flood zone areas , as the boiler can be taken out of the “danger zone”. Another advantage of mounting the external oil boilers at this height is that they are out of the way of children , who have an awful habit of trying to feed the exhaust flue with various items such as twigs, straws and pretty much anything they can get their hands on ! and the third advantage is the the exhaust or flue gases are in free air , which means that you are less likely to smell any obnoxious smells / fumes from the oil boiler.

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External Oil Boiler installed over 10 years ago, and still looking good


External Oil Boilers – Best Quality & Price UK Wide 

All of our external oil boilers have been designed and manufactured to the following standards – OFTEC OFS A100, European Directives BED 92/42 and EEC LVD EN 60335-1 and EMC 89/33C/EEC and are WRAS approved. They are designed to burn Kerosene 28 Class C fuel – to British Standard Specification BS 2869 Part 2 Class C2 , European standard BS EN 2869:2010 Class C2, which are also referred to as Heating Oil, 28 Second Burning Oil or Central Heating Fuel. This grade of Kerosene has clean burning characteristics whilst maintain a high heat output and maximum fuel economy.

External Oil Boiler for Sale UK & Ireland 

We have these heard the External Condensing Oil Boilers called everything from Outside Oil Boiler, Outdoor Oil Boiler, and you can call them what you like, all we know is that we have a British built, high quality External Oil Boiler, at some of the best prices on the UK market, so should you require any more information on our External Oil Boilers , please don’t please don’t hesitate to contact our sales team on 01202 822221 or click here for our email contact form

Download Flexiheat External Oil Boiler Manual