You may need these trades for your project. Tested in environmental test chambers to ensure good working range. All credit and debit cards are accepted. Useful efficiency (lhv - intermediate) - average temperature 70â°c. With a wealth of experience we offer a comprehensive service for the installation of your full central heating system with over 40 years in the heating business it makes us the right choice within the industry. If a property is connected to anglian water services.