What is Combined Primary Storage Unit (CPSU) Boiler?
A Combined Primary Storage Unit (CPSU) boiler is a special type of storage combi which stores a very large amount of water (usually more than 70 litres).
Boilers that store less that 70 litres generally fall in the combi (combination, instantaneous) boiler category.
This large water storage capacity creates a high hot water flow rate to taps and showers and heats up radiators quickly, making them good for larger homes. They also give the ability to run baths and showers simultaneously with minimal pressure drop.
The burner heats the stored water, and then this water is circulated round the heating circuit.
The hot water is instantaneously heated by being passed through a heated coil in the water store making it easy to get mains pressure hot water without the delays that are often associated with non-storage combi boilers.
Combined Primary Storage Unit (CPSU) boilers allow radiators to warm up very quickly & are capable of providing hot tap water at a high flow rate
Why should I get a Combined Primary Storage Unit (CPSU) boiler?
- Combined Primary Storage Unit (CPSU) boilers have a very high capacity, and they can therefore supply hot water to a variety of different sources like taps and showers simultanteously.
- Combined Primary Storage Unit (CPSU) boilers are able to supply hot water at very high flow rates instantly, making them ideal for larger homes.
What are the disadvantages to a Combined Primary Storage Unit (CPSU) boiler?
- They aren’t the most popular boilers and the range available isn’t as large as standard combi boilers. They are pretty expensive too…
- Whilst modern Combined Primary Storage Unit (CPSU) boiler designs have improved efficiency, the large water storage means energy efficiency isn’t as good as a normal combi boiler.
