How does an oil fired boiler work? | Viessmann
The heated water can be used in your radiators, taps and showers to provide your home with heating and hot water. An oil boiler should reach the same efficiency as a gas boiler. According to building regulations, oil boilers must have an energy rating of at least 86 per cent, or A+. A condensing oil fired boiler will usually have an efficiency of 90 per cent or higher. Oil is a more efficient fuel than gas.
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