Q: What’s the difference between a system boiler and a condensing boiler?

Question

Accepted Answer

A Condensing Boiler combines heating and hot water within a single unit. These types of boiler are often used in a domestic setting such as a house or flat where the demands are relatively modest and space is limited. The disadvantages of condensing boilerare where there is a high demand for hot water such as domestic dwellings with multiple bathrooms. In cold weather conditions these can impact the heating as a combi-boiler cannot service heating and hot water simultaenously. An apartment block with multiple flats can either have self contained heating systems, in which case a condensing boiler (depending on hot water deamnds) can be used. Alternatively a systems boiler could supply all the heating and hot water demands for every flat. This would require a systems boiler which would be housed in a boiler room or plant room. In scenarios such as this there are often two or three of higher wattage output. A systems boiler is fed directly from the main water supply, heated via a heat exchanger and stored in a reservior or header tank ready for immediate use. This means that there is always ample hot water regardless of the the amount of hot water required. Heating will therefore be uninterrupted throughout the building.

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