Low Pressure vs Mains Pressure Hot Water

How to tell what you have

Low-pressure systems typically have a header tank in the roof space, a vent pipe, and noticeably weaker hot-water flow than cold. Mains-pressure systems deliver hot and cold at similar pressure and have no ceiling tank.

What changes with mains pressure

Mains pressure generally means stronger showers, better balance between hot and cold, and more consistent performance when more than one outlet is in use. It also allows the use of modern tapware and shower systems designed for equal pressure.

What an upgrade involves

The cylinder is only part of the job. Pipework must be suitable for mains pressure, and pressure-limiting, expansion-control and tempering components need to be correctly specified and installed by a qualified plumber.

In some older homes, sections of pipework need replacing, which is the main reason quotes vary between properties.

Is it always worth it?

If your current system performs well and the cylinder is still healthy, there may be no urgency. The best time to consider an upgrade is when the cylinder is due for replacement anyway, or when you are renovating bathrooms.