Information & Advice

How do I know if a product is suitable for my water system?

Our products are advertised with a minimum rating for the recommended pressure in your home. Please see below for reference:

LP (Low pressure) – Minimum 0.2 Bar

MP (Medium pressure) – Minimum 0.5 Bar

HP1 (High pressure 1) – Minimum 1 Bar

HP2 (High pressure 2) – Minimum 2 Bar

HP3 (High pressure 3) – Minimum 3 Bar


It is always recommended to consult your installer before purchasing, but in general:

  • LP systems are water tanks in your loft space with a hot water cylinder. These are older systems and are often used in older houses.
  • Combination boilers typically run between 1 and 1.5 bar water pressure.
  • Pressurised systems, sometimes called Megaflows, are usually 3 bar water pressure.


Products with a lower pressure rating can be used on higher pressure systems up to 5 bar. For example, LP products can be used on a Megaflow system. HP products cannot be used with a low pressure water tank without a pump.