It really does seem as if you have had a system installed by totally unqualified people.
Until you have clarified the situation dont make any further payments.
A gas appliance MUST be installed by a Gas Registered person AND notified to Building Control.
"Builders" dont install boilers. Thats done by registered boiler engineere ( or plumbers if you must call them that ).
The unvented cylinder also has to be installed by a G3 qualified person and ALSO notified to Building Control.
Tony
Until you have clarified the situation dont make any further payments.
A gas appliance MUST be installed by a Gas Registered person AND notified to Building Control.
"Builders" dont install boilers. Thats done by registered boiler engineere ( or plumbers if you must call them that ).
The unvented cylinder also has to be installed by a G3 qualified person and ALSO notified to Building Control.
Tony