Specifications
www.johnsonandstarley.co.uk
2
THE BENCHMARK SCHEME
In order to comply with Building Regulations Part L (Part J in Scotland) the boiler 
MUST be fitted in accordance with the manufacturer’s instructions. 
Benchmark places responsibilities on both manufacturers and installers. The 
purpose is to ensure that customers are provided with the correct equipment for 
their needs, that it is installed, commissioned and serviced in accordance with the 
manufacturer’s instructions by competent persons and that it meets the requirements 
of the appropriate Building Regulations. The Benchmark Checklist can be used to 
demonstrate compliance with Building Regulations and should be provided to the 
customer for future reference.
Installers are required to carry out installation, commissioning and servicing work in 
accordance with the Benchmark Code of Practice which is available from the Heating 
and Hotwater Industry Council who manage and promote the Scheme. 
Visit www.centralheating.co.uk for more information.
COMBI SERIES
High Efficiency Combination Boilers










