The Chartered 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. Have list of quality installers.

Corgi Gas

Has now been replaced by the Gas Safe Register

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

Viessmann for quality energy efficient gas applications