A limited review of the modern central heating boiler types
Choosing a new or replacement central heating boiler can be a tough project. You might commence with the price but also need to think of other factors, the amount of hot water wanted at any time is also important, the space available in your house and how economic your new boiler will be.
The most common boiler types are:-
Gas gas back boilers
In the past gas back boilers were frequently fitted in houses, if you look cautiously in the chimney you might see the back boiler installed out of sight, the back boiler being obscured behind the fire. Low water pressure is a problem in these central heating boilers and they are now only fitted as replacements, installation requires a lot of space and you will want to find a place to conceal this form of boiler. A substitute back boiler even so could be your best choice if you already have one.
Most times, gas back boilers are not very efficient, but the more modern versions are more efficient, so by changing an elderly back boiler, you could make large savings on your annual heating charges.
Modern Combination gas boilers
In recent years the most popular type of central heating boiler sold is the combi central heating boiler. Combi central heating boilers use gas sparingly and are smaller than other heating boiler types allowing them to be thrust into small cupboards. Because they heat water immediately from the water mains, you do not have to wait for water to heat up – thus you get an endless stream of hot water.
Combi heating boilers have better cost-efficiency than other forms of boiler. As they don’t store hot water there are diminished heat losses. A drawback of this can be that the system cannot deliver hot water to several water taps at the same time.
Unvented system boilers
A central heating boiler works on the concept of stored hot water. This means that the space requirements are larger. One benefit of this type of central heating system is as many of the central heating constituents are built into the gas boiler enabling a speedier and lower-priced installation.
You can now draw several hot water taps simultaneously as they are supplied from the hot water tank. water pressure is raised if the tank is installed high in the home.
Open vent central heating boilers
a vented gas fired boiler is the most popular type of heating boiler. If you have one of these you will need to water storage tanks to be fitted in the loft, a lot of valuable storage space is taken as the hot water storage is also required in the airing cupboard.
Mains supply water is fed through one of loft cylinders to the hot water storage cylinder.
Water expansion and contraction is accommodated by the 2nd cylinder in the loft. Many taps or showers and baths can be run simultaneously but the hot water tank does have a limited capacity.