The Institute of Plumbing and Heating Engineering
Their technical Helpline is for the public, so if you have a technical query on any plumbing or heating matter, phone on 0870 414 5533.

Corgi Gas

The Website with information on registered gas installers and related topics

Ecotechnicians
For information on quality central heating controls, modulating technology, weather compensation and more

Viessmann for quality energy efficient gas applications

Vaillant quality energy efficient gas applications