Boiler Systems in the United Kingdom case study

pic-condensing-boilerWe discuss heat sources for the systems in the United Kingdom in a series of interesting facts about boilers.

In its most fundamental form, this is simply a metal box that is surrounded by a fire. In fact, the first heating systems were just this, a metal box referred to as a back boiler, found within the fireplace of the lounge. Surprisingly, there are a few still out there in some older properties.

  • A boiler is the appliance used to heat water for the purpose of supplying
    a central heating system and hot water to taps. The term ‘boiler’ is
    not ideal, however, because the water never actually boils inside the
    appliance – if it did, there would be something seriously wrong.
    Boilers today are fully automatic devices that turn up the heat
    as necessary and, with the exception of solid fuel systems,
    completely turn off when not required. The water is just heated
    until the required temperature is achieved, as set by its built-in
    thermostat, and then the heat source turns off. The fuels that
    could be used for the boiler include:
    CC solid fuel, including coal, wood and straw
    CC electricity
    CC gas
    CC oil.
    Electric boilers are quite rare and so they fall beyond the scope of
    this book. The remaining fuel types, however, have been used in
    boilers for many years, and the design of the boiler has developed
    into a very efficient appliance, unlike those of yesteryear.
    Solid fuel has limitations in its design, and because these boilers
    tend to be more labour-intensive – i.e. you need to load the fuel
    and empty the ash – they are not very popular and account for
    around only 0.5 per cent of all installations. Around 92 per cent
    of installations use gas and the rest use oil.
    Due to developments over the years, there are many different
    boiler designs from many different manufacturers, with a neverending
    list of models applicable to the particular designs. But
    fundamentally they all fall into one of four basic types:
    CC natural draught open-flued
    CC forced draught open-flued (fan-assisted)
    CC natural draught room-sealed
    CC forced draught room-sealed (fan-assisted).

Essentially, these names relate to the method by which air is
supplied to the boiler:
CC Natural draught or forced draught indicates whether or not
the appliance has a fan incorporated to assist in the removal
of the combustion products to the outside.
CC Open-flued boilers take their air from within the room where
the boiler is located.
CC Room-sealed means that the air is taken into the boiler from
outside the building.

The boiler in your home will be of one of these. For
-If you have a back boiler situated behind a gas fire in the
living room, you have a natural draught open-flued boiler.
-If you have a large free-standing boiler in your kitchen, with
a flue pipe coming from the top, travelling into a chimney or
passing through a pipe to discharge up above the roof, again
this is likely to be a natural draught open-flued boiler.
Both of these types take their air from the room in which they
are installed, and this air is replaced via an air vent from the
If your boiler has a terminal fitting flush with the wall, it is most
likely to be a room-sealed appliance.
– If this terminal is quite large, it will be of the natural draught
– If it is smaller, say about 100 mm in diameter, it will be fan
These boilers do not take the air required for the combustion
process from the room, but directly from outside.

There are many variations of boiler design, where the location
of the fan or the route of the flue pipe – which may be vertically
through a roof or horizontally out through the wall – may vary,
but they all fall within one of the four basic types listed above.

In addition to the basic boiler designs, boilers are further
classified into four generic types:
CC non-condensing regular boiler
CC non-condensing combination boiler
CC condensing regular boiler
CC condensing combination boiler.
The differences between regular boilers and combination boilers
will be discussed in next post, but a new term is
used here: ‘condensing’. For more detailed information or to get boiler quotes – great value quotes from trusted local engineers visit quote a twitter link coverage from our boiler installation and replacement partners or Quoteaboiler Facebook page.

Providing Comfort To Charlotte Since 1946


J. L. Patterson, Sr. started his company in 1946. Originally a coal and oil company, Patterson served a thriving Charlotte area. In 1951 after serving during WWII and graduating from the Citadel, J. L. Patterson, Jr. joined the family company. The 1960’s saw major changes in the company as Patterson, Jr. moved the company toward commercial and residential heating and air conditioning sales and installations. 

Dodson Patterson went to work for the company part-time in 1970 at the age of 16. He worked after school and on summer breaks through high school and college until he joined the company full time in 1977. Working as a service mechanic, residential installation mechanic, service manager, he eventually established the residential installation department. With only 3 installers he reached $800,000 in sales in 1991, making Patterson Heating and Air Conditioning a major force in residential HVAC sales. In 1992 Dodson moved to the commercial department to estimate and concentrate on managing the company. Since 1990 Patterson has grown from 13 to 50 employees. Patterson today proudly serves Charlotte and the surrounding areas from Mooresville to Rock Hill, Concord to Gastonia for quality commercial and residential heating and air conditioning systems, installation and maintenance. 

At Patterson we firmly believe that a company is only as good as the people that work there. We have been blessed with employees who have been a part of the company for many years. There are too many to list, but this shows the strong commitment we have to our employees and they to the company. We have found that this philosophy has been an asset to our customers.


Patterson Heating and Air Conditioning has been in the commercial HVAC business for over 54 years. We are very proud to have worked with some of Charlotte’s best general contractors. Companies like Metrolina Builders, Edison Foard, Foard*Collins Construction, Doerre Construction, Randolph Builders, Mann Contractors, Laxton Construction, Southern Constructors just to name a few. Patterson specializes in custom-designed HVAC systems. Our commercial experience in Charlotte includes area churches, race shops, restaurants, retail space and office space. 

If you own a commercial building or business and need new heating and air conditioning equipment, service or service contracts, please call us. We work on all makes of equipment and specialize in Trane and Lennox but service all brands.


At Patterson Heating and Air Conditioning we have been associated with the top of the line equipment manufacturers for over 30 years. We can install all makes of equipment, but believe that our Lennox, York and Trane residential products provide the highest quality available. Our Residential Consultants have over 20 years of experience. This makes them uniquely qualified to determine the best equipment and design modifications when making recommendations for replacing your home heating and cooling equipment. Our installation mechanics have a minimum 10 years experience each and through extensive training and continuing education are qualified to deal with on the job situations that might otherwise cause hours or even days of delay at your job.

Patterson Heating and Air Conditioning has hundreds of loyal customers whose systems we have upgraded over the years. From oil to gas heating, adding air conditioning, changing from window air conditioning and baseboard heat to heat pumps or gas furnaces and air conditioning with full duct systems. We build your new ductwork in our own fabrication shop, making custom fittings ourselves to insure maximum efficiency and total comfort.


Patterson’s Service Department works on all makes of equipment from Amana to York, specializing in Lennox equipment. Our technicians are professional, knowledgeable and dependable. Allen Byram has 25 years at Patterson, 18 of them as our Service Manager. We offer both commercial and residential repair services and installation of accessories such as humidifiers, electronic, static and media air purification systems, programmable thermostats and zone control devices. Patterson’s ComfortGuard Service Agreement guarantees proper maintenance of your heating and cooling systems with service scheduled for your convenience.

Lennox Healthy Climate™ indoor air quality systems are keys to creating a healthier, more comfortable home environment. According to the EPA, the air inside your home may be up to five times more polluted than the air outside. Given this fact, the EPA has ranked poor indoor air quality as one of the top five environmental issues in the United States. The Lennox Healthy Climate indoor air quality systems can go a long way toward improving the air you breathe by trapping and destroying harmful contaminants. Let Lennox’s Healthy Climate Solutions help you outsmart indoor air quality issues by eliminating pollutants and ventilating, cleaning and monitoring the air in your home.

Allergy Alert 4 Day Forecast

Pollen & Mold Forecast

Educate and entertain yourself with a quick online game that shows you how you can control the quality of the air inside your home. Destroy dust, banish bacteria and kill chemicals.