Classifier Instance:

Anchor text: North America
Target Entity: North_America
Preceding Context: Hydronic boilers are used in generating heat for residential and industrial purposes. They are the typical power plant for central heating systems fitted to houses in northern Europe (where they are commonly combined with domestic water heating), as opposed to the forced-air furnaces or wood burning stoves more common in
Succeeding Context: . The hydronic boiler operates by way of heating water/fluid to a preset temperature (or sometimes in the case of single pipe systems, until it boils and turns to steam) and circulating that fluid throughout the home typically by way of radiators, baseboard heaters or through the floors. The fluid can be heated by any means...gas, wood, fuel oil, etc., but in built-up areas where piped gas is available, natural gas is currently the most economical and therefore the usual choice. The fluid is in an enclosed system and circulated throughout by means of a pump. The name "boiler" can be a misnomer in that, except for systems using steam radiators, the water in a properly functioning hydronic boiler never actually boils. Some new systems are fitted with condensing boilers for greater efficiency. These boilers are referred to as condensing boilers because they are designed to extract the heat of vaporization of the flue gas water vapor. As a result of the lower flue gas temperatures, flue gas water vapor condenses to liquid and with dissolved carbon dioxide forms carbonic acid. The carbonic acid would damage a typical boiler by corroding the flue and fireside boiler heating surfaces. Condensing boilers solve this problem by routing the carbonic acid down a drain and by making the flue exposed to the corrosive flue gas of stainless steel or PVC. Although condensing boilers are becoming more popular, they are still less common than other types of hydronic boilers as they are more expensive.
Paragraph Title: Hydronic boilers
Source Page: Boiler

Ground Truth Types:

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