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Oil Combi Boilers

Oil Combi Boilers or Oil Combination boilers are oil boilers that can do both the central heating requirements of your property and your domestic hot water requirements as well, in one combined unit – thus the name combination or “combi” oil boilers. Combi or combination boilers are now the most popular type of boiler install on the UK market , as over 70% of UK households have them installed over other types of boilers.These oil combination boilers , due to their compact size are often the perfect heating and domestic hot water solution for smaller properties within the UK.

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Oil Combi Boilers – Oil Combination Boilers from Flexiheat UK

How do Oil Combination Boilers / Oil Combi Boilers Work ?

Oil combi boilers / Oil Combination boilers work by instantly heating the cold water from the mains supply as soon as there is a demand for domestic hot water, when a hot water tap is turned on, or when a shower is operated. This makes an oil combi boiler highly efficient as there is no requirement to have stored hot water in a cylinder or calorifier. This makes an oil combi boiler installation more compact , freeing up living space withing withing the home or flat.as well as being cheaper and easier to install and more economical to run.

Our Condensing Oil Combi Boiler incorporates a high-tech boiler, similar in principle to most oil fired boilers, which comprises an ultra compact heat exchanger and pressure jet burner. This boiler heats water, known as primary water, which circulates through radiators for central heating. In addition, for increased efficiency, it passes through our patented condensing unit

Our oil combi boiler benefits from a high efficiency plate heat exchanger
which transfers heat from the primary water to the domestic hot water directly from the mains, thus providing domestic hot water at mains pressure. Within the appliance are components such as a circulating pump, heating system expansion-vessel, water temperature control valve and such other controls which you would expect to find in a well designed, efficient modern oil heating system.With our Oil Combi boilers all this is extremely compact and a well engineered package.No need for copper storage cylinders, tanks of water in the loft, and long heat-wasteful pipe runs. Poor showers are a thing of the past, with our oil combi boilers

Oil combi boilers and hot water – Better but different- Condensing oil combi boilers produce hot water in a different manner from traditional systems with a copper storage cylinder. An understanding of the principle will enable you to obtain optimum results for your appliance and realise your level of expectation.

So what is the main difference? an Combination Boiler heats cold water directly from the mains by transferring heat in the boiler (primary water) to the incoming cold mains (domestic) water by means of a highly efficient ‘plate’ heat exchanger. In order to reduce the possibility of excessive water flow, each Combi incorporates a built in flow regulator, carefully sized according to the output of the appliance, in order to stabilise the delivery of hot water. This flow regulator also enhances the performance of its various control thermostats and mixing valves within the appliance which perform better when less subjected to extreme and sudden changes of volume and temperature.

The advantages of the system are:
a). Hot water is delivered at mains pressure (regardless of flow rate) which means that vigorous pressure can be delivered for showers. Typical mains pressure can be 2 Bar – 3.5 Bar compared with say 0.35 Bar – 0.6 Bar from a storage tank in the roof (each metre of ‘head’ produces merely 0.1 of a bar pressure).
b). The hot water is potable – that is, it is fresh from the mains like the cold supply and has not passed through storage tanks in the roof or a storage cylinder.
c). It is more economical and more efficient to produce hot water by this means rather than the old storage cylinder method.
d). Hot water can be produced indefinitely provided that the flow rate is equated to the boiler output.

In order to reduce the possibility of excessive water flow, each of our oil combi boilers incorporates a built in flow regulator, carefully sized according to the output of the appliance, in order to stabilise the delivery of hot water. This flow regulator also enhances the performance of its various control thermostats and mixing valves within the appliance which perform better when less subjected to extreme and sudden changes of volume and temperature.

Why get a new Oil Combination Boiler?

The Top reasons to get an oil combination boiler –

  • As long as you have mains cold water to your property, you can have unlimited domestic hot water – when ever your require it.
  • You don’t require a hot water cylinder or calorifier ,as well as a cold water storage tank in the loft / attic.This means they are particularly suited to being installed in a flat or smaller house
  • They are often quicker and easier to install than other oil heating systems as the system will contain less components.This often makes the heating and hot water installation cheaper to.
  • Environmental groups argue that the burning of fossil fuels is damaging to the environment. Oil Combi boilers make a significant contribution to lessen such emissions by reducing the amount of Carbon Dioxide (CO2) produced.
  • Oil is a more efficient fuel than gas, so you’ll get a good return on every unit of energy used. But,just like gas, the price of oil can fluctuate so sometimes it will be more cost effective.

Oil Fired Combination Boiler Efficiencies

Oil fired combi boiler efficiencies are very high these days with the combustion efficiencies at around 95%. Since the 1st April 2007 all oil fired boiler must have a Sedbuk efficiency of 86% or more – Sedbuk stands for “Seasonal Efficiency Of Domestic Boilers in the UK” and is an energy efficiency scheme devised by the UK government. The Sedbuk rating is calculated from laboratory tests combined with the type of fuel of an appliance, the climate,the hot water system, whether ignition if automatic or permanent and other such factors necessary to produce a meaningful indication of normal efficiency in typical usage.On 26 September 2015 the way boilers are rated for energy efficiency changed; SEDBUK was replaced by the Energy related Products (ErP) directive, bringing a new rating system into effect,to help reduce the impact we all have on the environment, via the EU’s long-term 20-20-20 targets: ErP applies to all residential and commercial heating products across Europe

Oil fired combi boilers Pros and Cons

Pros of Oil combi boilers:

  • Hot water is heated on demand, so there’s no waiting for a tank of water to heat up to run a bath or have a shower
  • Oil combi boilers are highly energy efficient, with most manufactured with an efficiency of 90% or above
  • The Hot water is delivered at the same pressure as the mains water, giving you a powerful hot shower without needing to have a separate shower pump
  • You should be able to save money on installation with an oil combination boiler, since no tank is needed and therefore there’s less pipe work required and a shorter installation time
  • Their compact size means they’re a great space saver; our wall hung oil combi boilers are even small enough to fit inside a standard kitchen or utility room, or you can use our externally mounted version, which take up no internal room at all.
  • Less likely to suffer from scaling up with sediment of calcium, dirt and scale unlike a storage cylinder or calorifier
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One potential problem that storage hot water cylinders tend to suffer from – Calcium,Dirt and Scale build up – this is much less likely with Oil Combi Boilers from Flexiheat UK , as no hot water is stored.

Cons of Oil combi boilers:

  • If your oil fired combi boiler breaks down, you lose both heating and domestic hot water
  • You will experience a decline in water pressure should more than one appliance require hot water at the same time
  • Unlike a domestic hot water storage system, which often has electrical immersion heaters in the event of a boiler breakdown, you don’t have this back up system with oil fired combi boilers

Oil combi boilers for sale

Here at Flexiheat UK, we have some of the best oil combi boilers for sale on the UK market.These boilers are robust and will give many years of trouble free service life. We have two different types of oil combi boilers for sale, the first being a wall mounted unit,which is an internal version, and the second being an external wall mounted unit,which is weatherproof and has been designed to fit on an external wall of the property.

We go into these two option in much great depth on their own individual dedicate pages, but here is a brief overview of the range

  1. There are two models available – The internal oil fired combination boiler has a heating output of 18 kW – or 61,416 Btu’s Output and a Domestic Hot Water performance of 24 kW- which will give a flow rate of 10.5 litres a minute,with a 35 Degrees C temperature rise . The larger unit which is externally mounted has an output of 23kW to 28kW Output- or 78,476 Btu’s to 95,536 Btu’s Output.The Flow rate of this boilers is 12 to 14 Litres a minute, with a 50 Degrees C temperature uplift or rise.
  2. The smaller model,which is an internal wall mounted boiler only is only available in an internal version . The larger boiler is only available as an external mounted version ( particularly useful should space for locating your oil combination boiler be at a premium or impractical)
  3. Both Oil Combi Boilers are what is termed as a “System Oil Boiler” – A system boiler is basically an standard boiler, which includes the pump and expansion tank that are built into the wall mounted condensing oil combi boiler which allows you to have a “sealed heating system”, 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 wall hung oil boiler, as everything is in one place , withing the boiler casing.
  4. Domestic Hot Water performance – The smaller oil fired combi boiler will produce 10.5 Litres / minute , with a temperature rise of 35C , also known as a Delta T of 35C – Whilst the larger oil combination boiler will produce 14 Litres / minute , with a temperature rise of 50C

Full technical details on our internal oil combi boilers can be found on it dedicated web page here

And for our external oil combi boilers the information can be found here

Best Quality & Price Oil Combination Boilers in the UK

All of our oil combi 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 is 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

We have heard our Oil Combi Boilers called everything from Oil Combination Boilers, Oil Fired Combi Boilers, and you can feel free to call them what you like, all we know is that we have a British built, high quality (we think it’s the best oil combi boiler on the market) Oil Combi Boiler, at some of the best prices on the UK market, so should you require any more information on our Oil Combination Boiler range , please do not hesitate to contact our sales team on 01202 822221 or click here for our email contact form