WHAT ARE COMBINATION BOILERS?
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A combination boilers heats water instantaneously whenever you turn on a hot tap, so you'll never run out of hot water. However, in most cases, the temperature at the tap is dependent on the temperature of the mains water supply and the flow-rate - hence hot water performance is quoted in terms of litres per min raised through 35°C. Typically it takes two or three times as long to deliver a bath full of hot water, whilst simultaneous use of two or more taps (or a shower and, say, a washing machine) can result in a trickle at each. And if the boiler has not fired recently it can take some time for the hot water to reach a useful temperature, potentially wasting metered water down the drain.

Some new models incorporate a small or medium sized storage cylinder to deliver usefully higher flow rates, at pre-selected temperatures and no waste of water. Of course they are correspondingly larger. Others fire intermittently to keep the heat exchanger warm and so reduce the time taken to reach the designed working temperature and save water. Standard combination boilers are invariably wall mounted but storage models may be wall mounted or floor standing.

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