I had a replacement boiler installed on a gravity system. Installers installed me a ferolli sigma 60, which states in book it should be installed on a fully pumped system. They didnt make it fully pumped, now i cannot control hot water, i only get it if C/H has been on, and if boiler goes off while gas is running there is banging through all the upstaris pipes.
What should I do, who to trust
What should I do, who to trust