Combi boilers are also perfect for smaller homes with limited space but need instant hot water. This is because they combine both the water heater and the central heating in one unit, removing the need for any additional hot or cold water tanks as you would need with a regular or system boiler.
The Potterton Promax Ultra 33kW is one of the more powerful boilers in its range, with an output of 33kW for central heating, which is powerful enough to heat a home with up to 20 radiators and 1-2 bathrooms. Smaller homes with lesser demand may not require this demand for central heating and hot water, and therefore, would be better suited to either the 24kW or 28kW and 40kW
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