Types of boiler
Gravity boiler system
Gravity boiler systems are particularly common in older homes, and usually consist of a cold-water tank in the loft, and a hot water cylinder in the airing cupboard. The water is brought down and heated inside the cylinder to feed your shower and taps. Gravity boiler systems often result in low water pressure, however this can be resolved using a shower pump.
Unvented boiler system
In an unvented boiler system, a high pressure water cylinder fed from the mains, is heated by an immersion heater, boiler or even solar panels to provide a generous and powerful showering pressure. These are generally more common in modern homes.
Combi boiler system
Combi boilers are most common in newer homes, and also a popular upgrade when replacing your heating and hot water system. Quite different to the other two types of boiler discussed, a combi system features a boiler with no tanks or water cylinders, designed to heat water as and when you need it, rather than storing the hot water before you’re ready to use it.