We provide our customers with quality installation and maintenance services and we have vast experiance in working with many different system sizes. From combination boilers to large commercial systems.
We have included some useful information, which you can find below, to help you decide on a suitable solution. However, for further advice or to arrange a visit please call 0208 540 7960.
In April 2005 the government issued a legislation that makes the installation of high efficiency boilers compulsory in most cases.
This legislation has been put in place to reduce the CO2 emissions throughout the UK, whilst offering the highest efficiency and low running costs to customers installing high efficiency boilers.
Sedbuk Ratings:
Boilers are now banded in groups A, B, C, D, E with band A being the most efficient.
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Boiler Types:
Conventionally Flued Boilers
This type of floor standing or wall mounted boiler design uses a chimney or lined flue to allow fumes to escape. One of the first boiler designs this method or design is dated and one of the least efficient methods of heating a system.
Balanced Flue or Power Flue
When any fuel is burnt wasted gases containing nitric oxide (Nox) are formed and must be vented to atmosphere either by chimney, lined flue or as most commonly used a balanced flue. Balanced flues are one cylindrical flue placed inside another one brings fresh oxygen to the boiler to help it burn the other takes the fumes to outside, generally from the rear of the boiler. Power flues use the same principal but use a fan to push fumes further and allow for boilers to be placed on internal walls and then flue to outside walls.
Twin pipe flue systems allow for air to be brought to the boiler from one source whilst flueing the gases to another.
Combination Boilers
Combination boilers evolved from Europe, and were quickly adopted by the UK as an efficient and space saving boiler design. Combination boilers usually wall mounted use mains pressure water fed directly from the main into the boiler and heat the water instantaneously to provide a never ending supply of hot water while maintaining heat to the radiators. A Plated heat exchanger allows water to pass through it and be heated for the domestic hot water (no storage tanks) making them ideal for flats small terrace properties or other dwellings looking to save space, although there are now combi-stores that have some additional hot water storage and higher burner outputs combination boilers can only achieve hot water flow rates between 9-Litres and 19 litres a minute so not ideal for multi-bathroom dwellings.
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System Boilers
System boilers are generally wall mounted and flued on a rear outlet balanced flue or power flue. Small in design this type of boiler is both compact efficient and linked to either a traditional copper cylinder and storage tanks or an unvented cylinder or thermal store hot water storage system (explained under Hot Water Heading) With no expansion or fed tank the expansion of hot water is taken up in an expansion vessel inside the boiler making them an ideal boiler that can be installed almost anywhere. On traditional system a smaller plastic tank in the loft next to the cold storage tank would have taken up this expanded water.
High Efficiency Boilers
Any type of boiler that achieves a Sedbuk rating in band A or B
Condensing Boilers
With any boiler when fuel is burnt to heat the water that fills radiators and hot water cylinders wasted gases/fumes are generated and must be safely vented to atmosphere through a flueing system, with the wasted gases/fumes a certain amount of latent heat is wasted. With condensing boilers this wasted heat is re-passed through a second heat exchanger and the wasted heat extracted and re-used to heat the system, making it the most efficient type of boiler on the market. Generally wall mounted the only other consideration when choosing this type of boiler is one of location. With the heat extracted from the flue gases the vapour left condensates to water droplets and has to be disposed of via a plastic waste trap and then into a soil pipe. Also the temperatures of the flue gases are lower, so a plume or mist appears when the boiler is running.
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