Most of the home boilers operate in much the same way they heat water. When the water gets hot enough it will be pumped through pipes to devices called radiators, which distribute the heat.
The big difference in types of boilers is the fuel that is burned to heat the water.
The most common fuel for boilers in North America is natural gas, because it is usually the cheapest.
When choosing which boiler is best for your home, First you need to Know which type of boilers exist.
There are three main types of boiler:
1. Conventional Boiler
2. System Boiler
3.Combination Boiler (Combi Boiler)
4. Condensing Boiler
Conventional boilers heat your central heating system directly and produce hot water for your cylinder. They send heated water to radiators and a hot water cylinder.
System boilers work in a similar way to conventional boilers but have some external parts built-in. There’s no need for a separate feed and expansion tank usually located in the loft.
Combi boiler differs in that the water is not stored anywhere (cold or hot), and is supplied on demand when you need it directly from the mains water feed. The term combination comes from the fact that it provides hot water for washing and hot water for heating.
Condensing boilers use heat from exhaust gases that would normally be released into the atmosphere through the flue. To use this latent heat, the water vapor from the exhaust gas is turned into liquid condensate. Due to this process, a condensing boiler is able to extract more heat from the fuel it uses than a standard efficiency boiler. It also means that less heat is lost through the flue gases.
Condensing boiler manufacturers claim that up to 98% thermal efficiency can be achieved, compared to 70%-80% with conventional designs. Typical models offer efficiencies around 90%, which brings most brands of condensing gas boiler in to the highest available categories for energy efficiency.
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