There are some clues as to which type of plumbing system you have. Let’s talk you through what you can see.
A combi boiler is normally located on a wall close to the incoming cold water mains supply. The boiler heats water on demand and, as a result, your system does not need to store water in tanks or cisterns. This is a completely sealed system, so the mains water pressure will directly affect the flow of water through your showers and taps.
Gravity boiler systems are the most common plumbing system in the UK. They rely on the natural fall of water to create water pressure and flow. The system will have a cold-water tank, usually in the roof space or loft. Hot water is heated by a boiler and stored in a hot-water cylinder, which is usually lagged and located in your airing cupboard.
Unvented boiler systems, or pressurized systems, are supplied directly from the mains water supply. A large, flat-topped metal cylinder, which heats and stores the water, will usually be found in the airing cupboard. As this is a completely sealed system, the mains water pressure will directly affect the flow of water through your house. As the water is stored under constant pressure, a smaller pressure vessel will be situated close to the cylinder, usually on top.
Salamander has a number of pumps to help improve the pressure in each of these systems.