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Biasi 28KW Riva Compact Combination Non Condensing Boiler
For gas-fired boilers, the installers you employ must be Council for Registered Gas Installers (CORGI) registered as a safety and legal requirement, and they should also be capable of installing condensing boilers.
For oil-fired boilers, you can employ an Oil Firing Technical Association (OFTEC) registered installer or some other reputable installer who is capable of installing condensing boilers. OFTEC members are approved to certify that their work meets building regulations. If you employ an installer who is not registered with OFTEC, you will need to tell your local authority's building control department before the installation work starts.
In all cases, check that your installer has recent qualifications in energy efficiency. CORGI or OFTEC can confirm this. If the installation is for an oil-fired boiler, an alternative would be to ask your installer if they hold a Certificate in Energy Efficiency for Domestic Heating or an equivalent qualification.
This allows for any stem expansion in the cylinder to flow directly into the cold tank and not damage the cylinder or cause air locks in the system.