System and oil-fired boiler options

An oil-fired boiler can be very compact, wall or floor mounted, clean and quiet. You can choose between standard and combinations boilers, or condensing boilers.

Central heating and hot water using a standard oil-fired boiler
A standard (or conventional) boiler heats your radiators and hot water when activated by a control. The hot water is then stored in a cylinder until it is needed. This type of system is most suitable for large families with multiple bathrooms or large houses where hot water is needed on demand and in significant quantities for heating, baths, washing machines, dish washers and so on.

Benefits
High flow rate for domestic hot water
No tank(s) in your loft
More than one hot tap/shower can easily operate at the same time.

Disadvantages
Hot water is not instant
Once the water in the storage cylinder runs out, you have to wait for it to reheat
You’ll need to find space for the cylinder (usually an airing cupboard).

Combination (combi) oil-fired boiler and central heating system
This is the most popular type of boiler in the UK, now found in around 70% of homes.

The combi boiler provides central heating and hot water without the need for a separate tank to store water; hence you can easily tuck it away under the stairs or in a kitchen cabinet. The combination boiler provides hot water on demand and heats your radiators when activated by a control similar to a standard boiler system. A combi boiler dispenses with the need for the hot water cylinder in the airing cupboard, the large cold water cistern (tank) plus small header cistern (tank) in the loft which are otherwise needed in a conventional vented heating system. All the major components are housed in one unit which makes it very convenient to the installer and saving space for the householder.

This system is generally suitable for smaller households, flats and bungalows where there are a smaller number of users with modest heating and hot water demands although some of the latest combination boilers can suit larger households.

Benefits
Instant, unlimited domestic hot water
Compact, easy to fit if space is limited.

Disadvantages
Unable to run multiple showers or baths at the same time
Lower flow rate for hot water than an open vent or system boiler.

Condensing oil-fired boiler
Both of the above types of boilers are available as condensing boilers. Condensing boilers are designed to recycle heat with an extra heat exchanger so that the hot exhaust gases are used to pre-heat the water in the boiler system, therefore reducing energy consumption and bills. Condensing boilers cost a little more but the energy savings will repay that extra initial investment in two to four years of normal use.


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