Combi Boilers provide heat for your radiators and domestic hot water on demand.
Hot tap water comes directly from the mains and is heated as it's used, so there's no need for a separate hot water storage cylinder or cold water feed cistern. But there's a small time lag between turning on the tap and getting hot water, and the flow rate is limited by how quickly the boiler is able to heat up the water.
The advantage is they require less space than heat-only boilers (because there is no storage cylinder), and avoid heating water that's not used immediately. On the down side, the flow rate limits how much water you can use at one time no filling the kitchen sink while running a bath, for instance. Therefore for it may be worth considering using a cylinder with a heat only boiler instead.
Wisdom Plumbing can recommend the best solution.
We will size the boiler according to how many rooms and radiators you have, as well as the number of hot water taps or devices that use hot water.